New heterobimetallic ferrocenyl derivatives: Evaluation of their potential as prospective agents against trypanosomatid parasites and Mycobacterium tuberculosis.
ino D Abstract Searching for prospective agents against infectious diseases, four new ferrocenyl derivatives, [M(L)(dppf)4](PF6), with M = Pd(II) or Pt(II), dppf = 1,1'-bis(dipheny1phosphino) ferrocene and HL = tropolone (HTrop) or hinokitiol (HHino), were synthesized and characterized. Complexes and ligands were evaluated against the bloodstream form of T. brucei, L. infantum amastigotes, M. tuberculosis (MTB) sensitive strain and MTB clinical isolates. Complexes showed a significant increase of the anti-T. brucei activity with respect to the free ligands (>28- and>46-fold for Trop and 6- and 22...
Source: Journal of Inorganic Biochemistry - July 23, 2018 Category: Biochemistry Authors: Rivas F, Medeiros A, Rodríguez Arce E, Comini M, Ribeiro CM, Pavan FR, Gambino D Tags: J Inorg Biochem Source Type: research

In vitro and in silico study of the biological activity of manganese(III) inverse-[9-MC-3]-metallacrowns and manganese(II) complexes with the anti-inflammatory drugs diclofenac or indomethacin.
Abstract In the present contribution, the biological properties of four manganese complexes with the non-steroidal anti-inflammatory drugs sodium diclofenac (Nadicl) or indomethacin (Hindo) in the presence or absence of salicylaldoxime (Η2sao), i.e. [Μn6(O)2(dicl)2(sao)6(CH3OH)6] 1, [Μn6(O)2(indo)2(sao)6(H2O)4], 2, [Μn(dicl)2(CH3OH)4], 3, and [Μn(indo)2(CH3OH)4], 4 are presented. More specifically, the in vitro cytotoxic effects of the complexes were evaluated against three cancer cell lines (HeLa, MCF-7 and A549 cells) as well as their combinatory activity with the well-known chemotherapeutic drug...
Source: Journal of Inorganic Biochemistry - July 21, 2018 Category: Biochemistry Authors: Geromichalos GD, Tarushi A, Lafazanis K, Pantazaki AA, Kessissoglou DP, Psomas G Tags: J Inorg Biochem Source Type: research

Syntheses and biological studies of nitroimidazole conjugated heteroscorpionate ligands and related Cu(I) and Cu(II) complexes.
Abstract Copper(I) and copper(II) complexes of 5-nitroimidazole conjugated heteroscorpionate ligands have been synthesized. In particular, the new 2,2-bis(pyrazol-1-yl)-N-(2-(2-methyl-5-nitro-1H-imidazol-1-yl)ethyl)acetamide ligand (LHMN) was synthesized by direct coupling of preformed side chain acid with 5-nitroimidazole and its coordination chemistry was investigated towards Cu(I) and Cu(II) acceptors and compared with that of the related 2,2-bis(3,5-dimethyl-1-H-pyrazol-1-yl)-N-(2-(2-methyl-5-nitro-1H-imidazol-1-yl)ethyl)acetamide ligand (LMeMN). The copper(II) complexes {[(LMeMN)2Cu]Cl2} and {[(LHMN)2Cu]Cl2} ...
Source: Journal of Inorganic Biochemistry - July 19, 2018 Category: Biochemistry Authors: Pellei M, Gandin V, Cimarelli C, Quaglia W, Mosca N, Bagnarelli L, Marzano C, Santini C Tags: J Inorg Biochem Source Type: research

Low Ctr1p, due to lack of Sco1p results in lowered cisplatin uptake and mediates insensitivity of rho0 yeast to cisplatin.
We report here that low copper medium rendered wild type hypersensitive to cisplatin, but failed to sensitize rho0 yeast to cisplatin. Wild type yeast grown in low copper medium exhibited ~2.0 fold enhanced cytotoxicity in survival and colony-forming ability compared to copper adequate wild type cells. The effect of copper restriction on cisplatin sensitivity was associated with upregulation of copper transporter 1 mRNA as well as protein, facilitating enhanced uptake and accumulation of cisplatin. Rho0 yeast also showed increased copper transporter 1 mRNA upon copper restriction, but failed to increase corresponding prote...
Source: Journal of Inorganic Biochemistry - July 19, 2018 Category: Biochemistry Authors: Bodiga S, Vemuri PK, Bodiga VL Tags: J Inorg Biochem Source Type: research

Excessive zinc chloride induces murine photoreceptor cell death via reactive oxygen species and mitochondrial signaling pathway.
Abstract Zinc (Zn) is a fundamental trace element for cell viability and physiology, and concentrations above the physiological level may lead to cell damage. In order to explore the effect of zinc chloride (ZnCl2) on murine photoreceptor cells, in this study, we investigated the alterations of murine photoreceptor cell proliferation and cell morphology after exposure to various concentrations of ZnCl2, determined the levels of hydrogen peroxide, hydroxyl radicals, cytochrome c, and ATP before and after cells exposure to different concentrations of ZnCl2, monitored the changes of mitochondrial membrane potential, ...
Source: Journal of Inorganic Biochemistry - July 19, 2018 Category: Biochemistry Authors: Wang H, Liu B, Yin X, Guo L, Jiang W, Bi H, Guo D Tags: J Inorg Biochem Source Type: research

Integrin αvβ3 receptor targeting PET/MRI dual-modal imaging probe based on the 64Cu labeled manganese ferrite nanoparticles.
Integrin αvβ3 receptor targeting PET/MRI dual-modal imaging probe based on the 64Cu labeled manganese ferrite nanoparticles. J Inorg Biochem. 2018 Jul 06;186:257-263 Authors: Shi X, Shen L Abstract With the advent of positron emission tomography/magnetic resonance imaging (PET/MRI) scanner, PET/MRI dual-modal imaging will play more and more important role in the diagnosis of cancers and other diseases. Until now, there is no an approved PET/MRI dual-modal imaging probe. The goal of this work is to design and synthesize potential PET/MRI dual-modal imaging probe based on superparamagnetic ma...
Source: Journal of Inorganic Biochemistry - July 6, 2018 Category: Biochemistry Authors: Shi X, Shen L Tags: J Inorg Biochem Source Type: research

Inhibitory effect of melittin on endonuclease-like activity of centrin.
Abstract The xeroderma pigmentosum group C protein (XPC) and centrin2 are the primary initiators of global genome nucleotide excision repair (NER). Centrin, acts as a member of the EF-hand super family of calcium-binding proteins, playing roles in reconstitution of the vitro NER reaction. To understand the possible molecular and structural properties of the multiprotein process, the interactions of Euplotes octocarinatus centrin (EoCen), melittin, and DNA are described. EoCen shares a sequence identity of 66% with centrin2. Melittin possesses inverse direction hydrophobic triads-leucine-leucine-tryptophan (LLW) wh...
Source: Journal of Inorganic Biochemistry - July 5, 2018 Category: Biochemistry Authors: Zhang W, Shi E, Zhao Y, Yang B Tags: J Inorg Biochem Source Type: research

Cytotoxicity, dual-targeting apoptosis induction evaluation of multinuclear cu complexes based on pyrazine-benzimidazole derivative.
Abstract To investigate the cytotoxicity and mechanism of action of multinuclear Cu complexes against tumor cell lines, two complexes, Cu6(bpbib)4Br8 (1) and Cu2(bpbib)2(BF4)2Cl2 (2) (bpbib = 1,4-bis((2-(pyrazin-2-yl)-1H-benzo[d]imidazol-1-yl)methyl)benzene) were synthesized and characterized. Both Cu complexes showed high selectivity toward cancer and not normal cells, and the SMMC7721 cell line showed most sensitivity toward both complexes. Complex 1 exhibited more potent cytotoxicity and enhanced cellular uptake, and therefore, was comprehensively investigated. Complex 1 exhibited dual effects in the inhibi...
Source: Journal of Inorganic Biochemistry - June 30, 2018 Category: Biochemistry Authors: Hu J, Chen S, Mao R, Liao C, Yang H, Zhao J Tags: J Inorg Biochem Source Type: research

Magnetic nanoparticles as a support for a copper (II) complex with nuclease activity.
s ICN Abstract Magnetic nanoparticles have been extensively explored for the development of platforms for drug delivery and imaging probes. In this work, we have used a modular capping strategy to produce magnetic gold-coated Fe3O4 (Fe3O4@Au) nanoparticles, which have been decorated with a copper (II) complex containing a thioether derivative of clip-phen (Fe3O4@Au@Cu), where the complex [Cu(2CP-Bz-SMe)]2+ has affinity to bind DNA and proven nuclease activity (2CP-Bz-SMe=1,3-bis((1,10-phenanthrolin-2-yl)oxy)-N-(4-(methylthio)benzylidene)propan-2-imine). The functionalization of Fe3O4@Au with the copper complex occ...
Source: Journal of Inorganic Biochemistry - June 30, 2018 Category: Biochemistry Authors: Silva MAS, Romo AIB, Abreu DS, Carepo MSP, Lemus L, Jafelicci M, Paulo TF, Nascimento OR, Vargas E, Denardin JC, Diógenes ICN Tags: J Inorg Biochem Source Type: research

MicroRNA-193b-3p regulates hepatocyte apoptosis in selenium-deficient broilers by targeting MAML1.
Abstract Selenium (Se) is an important nutritional element in the diet. Apoptosis is one of the characteristic pathological changes in liver tissue resulting from Se deficiency. MicroRNA (miRNA) plays an important role in cell proliferation, differentiation, apoptosis and tumorigenesis. However, why apoptosis occurs during Se deficiency and how miRNA regulates hepatocyte apoptosis in broilers requires further study. We used a dual luciferase reporter assay system and quantitative real-time PCR (qPCR) to screen hepatocytes in Se-deficient broilers for the specificity of hepatocyte apoptosis miRNA and its target pro...
Source: Journal of Inorganic Biochemistry - June 28, 2018 Category: Biochemistry Authors: Liu T, Yang T, Xu Z, Tan S, Pan T, Wan N, Li S Tags: J Inorg Biochem Source Type: research

Magnetic resonance imaging contrast enhancement in vitro and in vivo by octanuclear iron-oxo cluster-based agents.
acute;ndez R, Raptis RG Abstract A water-soluble octanuclear cluster, [Fe8], was studied with regard to its properties as a potential contrast enhancing agent in magnetic resonance imaging (MRI) in magnetic fields of 1.3, 7.2 and 11.9 T and was shown to have transverse relaxivities r2 = 4.01, 10.09 and 15.83 mM s-1, respectively. A related hydrophobic [Fe8] cluster conjugated with 5 kDa hyaluronic acid (HA) was characterized by 57Fe-Mössbauer and MALDI-TOF mass spectroscopy, and was evaluated in aqueous solutions in vitro with regard to its contrast enhancing properties [r2 = 3.65 mM s-1 (...
Source: Journal of Inorganic Biochemistry - June 24, 2018 Category: Biochemistry Authors: Das S, Parga K, Chakraborty I, Tinoco AD, Delgado Y, López PM, Fernández Vega L, Sanakis Y, Ghosh S, Bankson J, Klostergaard J, González-Méndez R, Raptis RG Tags: J Inorg Biochem Source Type: research

Hydrolysis reaction promotes changes in coordination mode of Ru(II)/acylthiourea organometallic complexes with cytotoxicity against human lung tumor cell lines.
In this study, Ru(II)-arene complexes with acylthiourea ligands of the type [Ru(η6‑p‑cymene)(PPh3)(T)Cl]PF6(1-5) and [Ru(η6‑p‑cymene)(PPh3)(T)]PF6(1a, 4a), where PPh3 = triphenylphosphine and T = N‑acyl‑N'(monosubstituted)thiourea, were synthesized and characterized, and their cytotoxic properties were also evaluated. 1a and 4a were obtained from the hydrolysis reaction of 1 and 4. All complexes showed unusual coordination modes for acylthiourea ligands, which are coordinated in a monodentate fashion (S) in 1-5, while they found to be bidentate (S,N), in 1a and 4a. To the best of our knowledge, ...
Source: Journal of Inorganic Biochemistry - June 18, 2018 Category: Biochemistry Authors: Cunha BN, Colina-Vegas L, Plutín AM, Silveira RG, Honorato J, Oliveira KM, Cominetti MR, Ferreira AG, Castellano EE, Batista AA Tags: J Inorg Biochem Source Type: research

Selective Cu(I) complex with phosphine-peptide (SarGly) conjugate contra breast cancer: Synthesis, spectroscopic characterization and insight into cytotoxic action.
Abstract The main disadvantage of conventional anticancer chemotherapy is the inability to deliver the correct amount of drug directly to cancer. Those molecular delivering systems are very important to destroy cancer cells selectively. Herein we report synthesis of phosphine-peptide conjugate (Ph2PCH2-Sar-Gly-OH, PSG) derived from SarGly (sarcosine-glycine), which can be easily exchanged to other peptide carriers, its oxide (OPh2PCH2-Sar-Gly-OH, OPSG) and the first copper(I) complex ([CuI(dmp)(P(Ph)2CH2-Sar-Gly-OH)], 1-PSG, where dmp stands for 2,9-dimethyl-1,10-phenanthroline). The compounds were characterized b...
Source: Journal of Inorganic Biochemistry - June 18, 2018 Category: Biochemistry Authors: Komarnicka UK, Kozieł S, Starosta R, Kyzioł A Tags: J Inorg Biochem Source Type: research

Interactions between metal binding viral proteins and human targets as revealed by network-based bioinformatics.
Abstract The role of metal ions in virus-host interactions is largely unknown. In the present computational study, the putative zinc, manganese, magnesium, and iron metalloproteomes of 226 different viruses were identified and then the human proteins interacting the viral metalloproteomes were retrieved through network-based bioinformatics. Protein features such as abundance, function and structurally disorder were classified according to the metal type bound to viral proteins. Likely perturbations of host cellular metal homeostasis by viral metal binders are also discussed. Furthermore, possible molecular linkage...
Source: Journal of Inorganic Biochemistry - June 15, 2018 Category: Biochemistry Authors: Chasapis CT Tags: J Inorg Biochem Source Type: research

Cross-linked cytochrome P450 BM3 aggregates promoted by Ru(II)-diimine complexes bearing aldehyde groups.
Abstract Cross-linked enzyme aggregate (CLEA) methodology has been applied to immobilize cytochrome P450 BM3 variants (F87A and 21B3) with peroxygenase activity. Several Ru(II)-diimine complexes were found to be suitable cross-linking agents, surpassing the traditional glutaraldehyde and dextran aldehyde. They offer modular numbers of aldehyde functionalities and a more rigid framework than their organic counterparts. The F87A CLEAs display significant activity loss compared to the protein in solution. Meanwhile, for the 21B3 CLEAs, high activity recovery (up to 95%) is obtained. In order to minimize enzyme leachi...
Source: Journal of Inorganic Biochemistry - June 5, 2018 Category: Biochemistry Authors: Do MQ, Henry E, Kato M, Cheruzel L Tags: J Inorg Biochem Source Type: research

Bifunctional 3-hydroxy-4-pyridinones as effective aluminium chelators: synthesis, solution equilibrium studies and in vivo evaluation.
Abstract This paper reports the results on the study of a set of synthesized bifunctional 3-hydroxy-4-pyridinones chelators as potential aluminium sequestering agents. They were N-functionalized with alkyl-amino, -carboxylic and -(amino-carboxylic) groups, envisaging the improvement of the Al3+ sequestering capacity, in comparison with the marketed chelating drug deferiprone. The main focus of this work was given to the assessment of their binding ability towards Al3+, which was studied by potentiometric and UV-Vis spectrophotometric measurements carried out at T = 298.15 K. The speciation models were charac...
Source: Journal of Inorganic Biochemistry - May 30, 2018 Category: Biochemistry Authors: Irto A, Cardiano P, Chand K, Cigala RM, Crea F, De Stefano C, Gano L, Sammartano S, Santos MA Tags: J Inorg Biochem Source Type: research

Determining the glycation site specificity of human holo-transferrin.
, Rangel M Abstract Understanding the effect of glycation on the function of transferrin, the systemic iron transporter, is fundamental to fully grasp the mechanisms leading to the loss of iron homeostasis observed in diabetes mellitus (DM). The spontaneous reaction with protein amino groups is one of the main causes of glucose toxicity, but the site specificity of this reaction is still poorly understood. Here in, an in vitro approach was used to study human holo-transferrin glycation in detail. Lysine residues 103, 312 and 380 proved to be the most reactive sites, and overall glycation specificity was found to b...
Source: Journal of Inorganic Biochemistry - May 26, 2018 Category: Biochemistry Authors: Silva AMN, Coimbra JTS, Castro MM, Oliveira Â, Brás NF, Fernandes PA, Ramos MJ, Rangel M Tags: J Inorg Biochem Source Type: research

Binding properties of chiral ruthenium(II) complexes Λ- and Δ-[Ru(bpy)2dppz-11-CO2Me]2+ toward the triplex RNA poly(U)•poly(A)*poly(U).
Binding properties of chiral ruthenium(II) complexes Λ- and Δ-[Ru(bpy)2dppz-11-CO2Me]2+ toward the triplex RNA poly(U)•poly(A)*poly(U). J Inorg Biochem. 2018 May 24;186:51-59 Authors: Ni W, Liu X, Tan L Abstract Two chiral ruthenium(II) complexes containing ligand dppz-CO2Me (dppz-11-CO2Me = dipyrido[3,2-a,2',3'-c]phenazine-11-carboxylic acid methyl ester), Δ-[Ru(bpy)2dppz-11-CO2Me]2+ (bpy = 2,2'-bipyridine; Δ-1) and Λ-[Ru(bpy)2dppz-11-CO2Me]2+ (Λ-1), were synthesized and characterized. The binding of the two enantiomers with the triplex RNA poly(U)&...
Source: Journal of Inorganic Biochemistry - May 24, 2018 Category: Biochemistry Authors: Ni W, Liu X, Tan L Tags: J Inorg Biochem Source Type: research

The trans-[Ru(PPh3)2(N,N-dimethyl-N'-thiophenylthioureato-k2O,S)(bipy)]PF6 complex has pro-apoptotic effects on triple negative breast cancer cells and presents low toxicity in vivo.
Abstract Triple negative breast cancer (TNBC) is a heterogeneous subtype of breast tumors that does not exhibit the expression of estrogen and progesterone receptors, neither the amplification of the human epidermal growth factor receptor 2 (HER-2) gene. Despite all the advances in cancer treatments, the development of new anticancer drugs for TNBC tumors is still a challenge. There is an increasing interest in new agents to be used in cancer treatment. Ruthenium is a metal that has unique characteristics and important in vivo and in vitro results achieved for cancer treatment. Thus, in this work, with the aim to ...
Source: Journal of Inorganic Biochemistry - May 24, 2018 Category: Biochemistry Authors: Becceneri AB, Popolin CP, Plutin AM, Maistro EL, Castellano EE, Batista AA, Cominetti MR Tags: J Inorg Biochem Source Type: research

Gallium(III) complexes of α-N-heterocyclic piperidylthiosemicarbazones: Synthesis, structure-activity relationship, cellular uptake and activation of caspases-3/7/9.
Gallium(III) complexes of α-N-heterocyclic piperidylthiosemicarbazones: Synthesis, structure-activity relationship, cellular uptake and activation of caspases-3/7/9. J Inorg Biochem. 2018 May 23;186:42-50 Authors: Qi J, Yao Q, Qian K, Tian L, Cheng Z, Wang Y Abstract Two types of α-N-heterocyclic piperidylthiosemicarbazone ligands and related Ga(III) complexes were synthesized. The structure of Ga4 and Ga5 were characterized by X-ray single crystal diffraction. We generated the related α-N-heterocycliperidinylthiosemicarbazone analogs to examine the effect of aldehydes or ketones in ...
Source: Journal of Inorganic Biochemistry - May 23, 2018 Category: Biochemistry Authors: Qi J, Yao Q, Qian K, Tian L, Cheng Z, Wang Y Tags: J Inorg Biochem Source Type: research

Combination of 7-hydroxycoumarin in a platinum(IV) complex derived from cisplatin enhanced cytotoxicity with multiple mechanisms of action.
Abstract A novel compound, Cou-platin, composed of 7-hydroxycoumarin and a platinum(IV) moiety derived from cisplatin was designed and synthesized. Significantly, Cou-platin exhibited more potent in vitro antitumor activity against all tested cancer cell lines than that of cisplatin, which was mainly attributed to the liberation of cisplatin and 7-hydroxycoumarin upon reduction with a biomolecular agent. Besides, cellular accumulation of Cou-platin was dramatically increased among several cancer cells in contrast to cisplatin. Flow cytometry study revealed that Cou-platin arrested cell cycle at G2 phase and induce...
Source: Journal of Inorganic Biochemistry - May 23, 2018 Category: Biochemistry Authors: Hua W, Zhao J, Hu W, Gou S Tags: J Inorg Biochem Source Type: research

Interaction of 17 α-hydroxylase, 17(20)-lyase (CYP17A1) inhibitors - abiraterone and galeterone - with human sterol 14α-demethylase (CYP51A1).
Interaction of 17α-hydroxylase, 17(20)-lyase (CYP17A1) inhibitors - abiraterone and galeterone - with human sterol 14α-demethylase (CYP51A1). J Inorg Biochem. 2018 May 21;186:24-33 Authors: Masamrekh R, Kuzikov A, Veselovsky A, Toropygin I, Shkel T, Strushkevich N, Gilep A, Usanov S, Archakov A, Shumyantseva V Abstract Abiraterone and galeterone induce type I differential spectral changes in human sterol 14α-demethylase (cytochrome P450 51A1, CYP51A1) with the sigmoidal shape of the binding curve. After approximation of the data by Hill model, the half-saturation concentrations (K0.5...
Source: Journal of Inorganic Biochemistry - May 21, 2018 Category: Biochemistry Authors: Masamrekh R, Kuzikov A, Veselovsky A, Toropygin I, Shkel T, Strushkevich N, Gilep A, Usanov S, Archakov A, Shumyantseva V Tags: J Inorg Biochem Source Type: research

Collagen promotes matrix vesicle-mediated mineralization by vascular smooth muscle cells.
Abstract Vascular calcification (VC) is a hallmark of atherosclerotic plaques. Calcification of advanced plaques shares common features with endochondral ossification of long bones and appears to be protective. On the other hand, microcalcification of early plaques, which is poorly understood, is thought to be harmful. Tissue-nonspecific alkaline phosphatase (TNAP) and collagen are the two proteins necessary for physiological mineralization. Here, we demonstrate the presence of membrane-bound TNAP, detected by immunofluorescence, that seems to form clusters on the plasma membrane of vascular smooth muscle cells (V...
Source: Journal of Inorganic Biochemistry - May 18, 2018 Category: Biochemistry Authors: Roszkowska M, Strzelecka-Kiliszek A, Bessueille L, Buchet R, Magne D, Pikula S Tags: J Inorg Biochem Source Type: research

Functional modeling of the MnCAT active site with a dimanganese(III) complex of an unsymmetrical polydentate N3O3 ligand.
gnorella SR Abstract A new diMnIII complex, [Mn2L(OAc)2(H2O)](BPh4)·3H2O (1), obtained with the unsymmetrical N3O3-ligand H3L = 1-[N-(2-pyridylmethyl),N-(2-hydroxybenzyl)amino]-3-[N'-(2-hydroxybenzyl),N'-(benzyl)amino]propan-2-ol, has been prepared and characterized. The unsymmetrical hexadentate ligand L3- leads to coordination dissymmetry (dissimilar donor atoms) around each Mn ion (N2O4 and NO4(solvent), respectively) leaving one labile site on one of the two Mn ions that facilitates interaction of the metal center with H2O2, as in Mn catalase. 1 is able to catalyze H2O2 disproportionation in acetoni...
Source: Journal of Inorganic Biochemistry - May 18, 2018 Category: Biochemistry Authors: Ledesma GN, Anxolabéhère-Mallart E, Sabater L, Hureau C, Signorella SR Tags: J Inorg Biochem Source Type: research

A survey of methionine-aromatic interaction geometries in the oxidoreductase class of enzymes: What could Met-aromatic interactions be doing near metal sites?
Abstract Redox reactions of the aromatic amino acids tyrosine (Tyr) and tryptophan (Trp) are crucial for the biological functions of many metalloproteins. An important question is how biological systems can use the protein environment to move electrons through proteins in a controlled manner. Methionine (Met)-aromatic interactions are common in proteins, but little is known about redox reactions of such motifs. Here, we explore methionine sulfur-aromatic interactions in the oxidoreductase (EC 1) class of proteins and their proximity to metal sites. We also propose a new metric for classifying Met-aromatic interact...
Source: Journal of Inorganic Biochemistry - May 18, 2018 Category: Biochemistry Authors: Weber DS, Warren JJ Tags: J Inorg Biochem Source Type: research

Cationic Au(I) complexes with aryl-benzothiazoles and their antibacterial activity.
Abstract Two cationic Au(I) complexes derived from aryl-benzothiazoles, namely [(PPh3)Au(pbt)](OTf) (1) and [(PPh3)Au(qbt)](OTf) (2) (where pbt = 2‑(pyridyl)benzothiazole and qbt = (quinolyl)benzothiazole, and OTf- = trifluoromethanesulfonate anion), have been synthesized and structurally characterized by X-ray crystallography. Both complexes exhibit strong antibacterial effects against Gram-negative bacteria such as Acinetobacter baumannii and Pseudomonas Aeruginosa. Results of examination of the reactions of 1 and 2 indicate that these cationic Au(I) complexes rapidly cross the bacterial membrane a...
Source: Journal of Inorganic Biochemistry - May 11, 2018 Category: Biochemistry Authors: Stenger-Smith J, Chakraborty I, Mascharak PK Tags: J Inorg Biochem Source Type: research

How does binuclear zinc amidohydrolase FwdA work in the initial step of methanogenesis: From formate to formyl-methanofuran.
Abstract The initial step of methanogenesis is the fixation of CO2 to formyl-methanofuran (formyl-MFR) catalyzed by formyl-MFR dehydrogenase, which can be divided into two half reactions. Herein, the second half reaction catalyzed by FwdA (formyl-methanofuran dehydrogenase subunit A), i.e., from formate to formyl-methanofuran, has been investigated using density functional theory and a chemical model based on the X-ray crystal structure. The calculations indicate that, compared with other well-known di-zinc hydrolases, the FwdA reaction employs a reverse mechanism, including the nucleophilic attack of MFR amine on...
Source: Journal of Inorganic Biochemistry - May 11, 2018 Category: Biochemistry Authors: Zhang XW, Chen SL Tags: J Inorg Biochem Source Type: research

Effects on estrogen-dependent and triple negative breast cancer cells growth of Ni(II), Zn(II) and Cd(II) complexes with the Schiff base derived from pyridine-2-carboxaldehyde and 5,6-diamino-1,3-dimethyluracil explored through the renin-angiotensin system (RAS)-regulating aminopeptidases.
Martínez-Martos JM, Moreno-Carretero MN Abstract A series of Ni(II), Zn(II) and Cd(II) complexes with the Schiff base derived from the condensation 1:1 from pyridine-2-carboxaldehyde and 5,6-diamino-1,3-dimethyluracil (6-amino-1,3-dimethyl-5-[(pyridin-2-ylmethylidene)-amino]pyrimidine-2,4(1H,3H)-dione, DAAUPic) were synthesized and subsequently characterized by means of elemental analysis, FT-IR, NMR and nine of them by X-ray diffraction. Except the [Zn(μ-O,O'-AcO)(N5,N6,N1F-DAAUPicH-1)]2 and [Cd(O,O'-NO3)(μ-O4,(N5,N6,N1F)-DAAUPicH-1)(H2O)]2·2H2O dimers and the [Cd(μ-S,N-SCN)(N5,N6,N1F-DAAU...
Source: Journal of Inorganic Biochemistry - May 9, 2018 Category: Biochemistry Authors: Illán-Cabeza NA, Jiménez-Pulido SB, Hueso-Ureña F, Ramírez-Expósito MJ, Sánchez-Sánchez P, Martínez-Martos JM, Moreno-Carretero MN Tags: J Inorg Biochem Source Type: research

Investigating Cytochrome P450 specificity during glycopeptide antibiotic biosynthesis through a homologue hybridization approach.
Abstract Cytochrome P450 enzymes perform an impressive range of oxidation reactions against diverse substrate scaffolds whilst generally maintaining a conserved tertiary structure and active site chemistry. Within secondary metabolism, P450 enzymes play widespread and important roles in performing crucial modifications of precursor molecules, with one example of the importance of such reactions being found in the biosynthesis of the glycopeptide antibiotics (GPAs). In GPA biosynthesis P450s, known as Oxy enzymes, are key players in the cyclization of the linear GPA peptide precursor, which is a process that is bot...
Source: Journal of Inorganic Biochemistry - May 3, 2018 Category: Biochemistry Authors: Brieke C, Tarnawski M, Greule A, Cryle MJ Tags: J Inorg Biochem Source Type: research

Novel polypyridyl ruthenium complexes acting as high affinity DNA intercalators, potent transcription inhibitors and antitumor reagents.
Abstract Six novel polypyridyl ruthenium complexes with (E)-2-styryl-1H- imidazo[4,5-f][1,10]phenanthroline ligand and its analogues have been designed to enhance the DNA intercalation ability of their model compound [Ru(bpy)2(pip)]2+ (bpy = 2,2'-bipyridine, pip = 2-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline). As shown in the optimized geometry of the complexes, the introduction of styryl group not only extended the conjugated area of the intercalative ligand, but also retained the excellent planarity. These two merits have been proven to be beneficial for their DNA intercalation, thus greatly improved t...
Source: Journal of Inorganic Biochemistry - May 2, 2018 Category: Biochemistry Authors: Ma GL, Bi XD, Gao F, Feng Z, Zhao DC, Lin FJ, Yan R, Liu D, Liu P, Chen J, Zhang H Tags: J Inorg Biochem Source Type: research

Structure of cytochrome P450 2B4 with an acetate ligand and an active site hydrogen bond network similar to oxyferrous P450cam.
PMID: 29730233 [PubMed - as supplied by publisher] (Source: Journal of Inorganic Biochemistry)
Source: Journal of Inorganic Biochemistry - April 30, 2018 Category: Biochemistry Authors: Yang Y, Bu W, Im S, Meagher J, Stuckey J, Waskell L Tags: J Inorg Biochem Source Type: research

Conserved cysteine residues are necessary for nickel-induced allosteric regulation of the metalloregulatory protein YqjI (NfeR) in E. coli.
Abstract Transition metal homeostasis is necessary to sustain life. First row transition metals act as cofactors within the cell, performing vital functions ranging from DNA repair to respiration. However, intracellular metal concentrations exceeding physiological requirements may be toxic. In E. coli, the YqjH flavoprotein is thought to play a role in iron homeostasis. YqjH is transcriptionally regulated by the ferric uptake regulator and a newly discovered regulator encoded by yqjI. The apo-form of YqjI is a transcriptional repressor of both the yqjH and yqjI genes. YqjI repressor function is disrupted upon bind...
Source: Journal of Inorganic Biochemistry - April 26, 2018 Category: Biochemistry Authors: Blahut M, Dzul S, Wang S, Kandegedara A, Grossoehme NE, Stemmler T, Outten FW Tags: J Inorg Biochem Source Type: research

A combined computational and experimental study on selective flucloxacillin hydroxylation by cytochrome P450 BM3 variants.
Abstract The 5'-hydroxymethyl metabolite of the penicillin based antibiotic flucloxacillin (FLX) is considered to be involved in bile duct damage occurring in a small number of patients. Because 5'-hydroxymethyl FLX is difficult to obtain by organic synthesis, biosynthesis using highly active and regioselective biocatalysts would be an alternative approach. By screening an in-house library of Cytochrome P450 (CYP) BM3 mutants, mutant M11 L437E was identified as a regioselective enzyme with relatively high activity in production of 5'-hydroxymethyl FLX as was confirmed by mass spectrometry and NMR. In contrast, inc...
Source: Journal of Inorganic Biochemistry - April 24, 2018 Category: Biochemistry Authors: Luirink RA, Dekker SJ, Capoferri L, Janssen LFH, Kuiper CL, Ari ME, Vermeulen NPE, Vos JC, Commandeur JNM, Geerke DP Tags: J Inorg Biochem Source Type: research

Modeling the hydrogen sulfide binding to heme.
Abstract The binding of hydrogen sulfide to a model heme compound is investigated by coupled-cluster singles-doubles augmented by a perturbative triple excitations, CCSD(T), and density functional theory, DFT. The minimum energy path for the H2S addition to an isolated heme center of the heme protein is evaluated by adopting as a model the heme compound FeP(Im) (P = porphyrin; Im = imidazole). The FeP(Im)-H2S aduct is bound by 13.7 kcal/mol at the CCSD(T) level of theory. Relaxed potential energy curves for the lowest lying spin states of the H2S to FeP(Im) binding using DFT reveal that the binding proce...
Source: Journal of Inorganic Biochemistry - April 21, 2018 Category: Biochemistry Authors: Ostojić BD, Schwerdtfeger P, Đorđević DS Tags: J Inorg Biochem Source Type: research

Role of the HSPA9/HSC20 chaperone pair in promoting directional human iron-sulfur cluster exchange involving monothiol glutaredoxin 5.
Abstract Iron‑sulfur clusters are essential cofactors found across all domains of life. Their assembly and transfer are accomplished by highly conserved protein complexes and partners. In eukaryotes a [2Fe-2S] cluster is first assembled in the mitochondria on the iron‑sulfur cluster scaffold protein ISCU in tandem with iron, sulfide, and electron donors. Current models suggest that a chaperone pair interacts with a cluster-bound ISCU to facilitate cluster transfer to a monothiol glutaredoxin. In humans this protein is glutaredoxin 5 (GLRX5) and the cluster can then be exchanged with a variety of target apo pro...
Source: Journal of Inorganic Biochemistry - April 11, 2018 Category: Biochemistry Authors: Olive JA, Cowan JA Tags: J Inorg Biochem Source Type: research

Refolding kinetics of cytochrome c studied with microsecond timescale continuous-flow UV-vis spectroscopy and rapid freeze-quench EPR.
Abstract The study of the structure, function, folding and conformational transitions of cytochrome c is of great interest because this protein plays an important role in biological electron transport and apoptosis. The different native and non-native conformations have been studied extensively under equilibrium conditions at different pH values, however, kinetic studies are rare because they require technically challenging rapid mixing and spectroscopic monitoring techniques. Here we present the refolding kinetics of acid denatured cytochrome c using the pH jump technique from pH 2 to pH 4.7 in combination wi...
Source: Journal of Inorganic Biochemistry - April 11, 2018 Category: Biochemistry Authors: Srour B, Strampraad MJF, Hagen WR, Hagedoorn PL Tags: J Inorg Biochem Source Type: research

Liposomal formulations of magnesium sulfanyl tribenzoporphyrazines for the photodynamic therapy of cancer.
In this study, previously synthesized dendritic magnesium tribenzoporphyrazines were incorporated into four types of liposomes containing either 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) or 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE) as the zwitterionic lipids. The addition of either l-α-phosphatidyl-dl-glycerol (PG) or 1,2-dioleoyl-3-trimethylammoniumpropane (DOTAP) imparted a negative or positive charge, respectively. Novel formulations were tested in oral squamous cell carcinoma cell lines (CAL 27, HSC-3) as well as cervical adenocarcinoma cells (HeLa). Positively charged DOTAP:POPC liposome...
Source: Journal of Inorganic Biochemistry - April 9, 2018 Category: Biochemistry Authors: Piskorz J, Mlynarczyk DT, Szczolko W, Konopka K, Düzgüneş N, Mielcarek J Tags: J Inorg Biochem Source Type: research

Alpha lipoic acid attenuates cadmium-induced nephrotoxicity via the mitochondrial apoptotic pathways in rat.
Abstract Alpha lipoic acid (α-LA), a potent antioxidant, is protective against acute nephrotoxicity. In the present study, the attenuation of cadmium (Cd)-induced kidney injury by α-LA on was investigated in a rat model. Exposure to 50 mg/L Cd for 12 weeks increased kidney index and Cd content, malondialdehyde (MDA) levels, and histological damage to the renal cortex, and decreased the activities of glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), catalase (CAT), and glutathione (GSH). Treatment with 50 mg/L Cd also damaged renal cell mitochondria and nuclei, and activated the mitocho...
Source: Journal of Inorganic Biochemistry - April 7, 2018 Category: Biochemistry Authors: Chen S, Liu G, Long M, Zou H, Cui H Tags: J Inorg Biochem Source Type: research

Influence of copper(II) ions on the noncovalent interactions between cytidine-5'-diphosphate or cytidine-5'-triphosphate and biogenic amines putrescine or spermidine.
Abstract Potentiometric and NMR spectroscopic studies of the nucleotide (NucP)/polyamine (PA) system (where NucP = CDP, CTP, PA = putrescine or spermidine) revealed the formation of molecular complexes (NucP)(Hx+y)(PA) (where Hx+y = number of protons; x - from NucP and y - from PA). Their thermodynamic parameters were determined and the modes of their interactions were proposed. The main reaction centers were found to be the protonated amine groups of polyamine (positive centers) and phosphate groups of nucleotide (negative centers). The pH ranges in which the complex occurs correspond to those of amin...
Source: Journal of Inorganic Biochemistry - April 6, 2018 Category: Biochemistry Authors: Bregier-Jarzębowska R, Łomozik L, Gąsowska A Tags: J Inorg Biochem Source Type: research

EPR evidence for a fast-relaxing iron center in Na+-translocating NADH:quinone-oxidoreductase.
Abstract A paramagnetic Cys4[Fe] center was detected by pulse EPR in Na+-translocating NADH:quinone-oxidoreductase (Na+-NQR) by influence of this center on transverse and longitudinal spin relaxation of Na+-NQR flavin radicals. The oxidation state of the Cys4[Fe] center was Fe3+ in the oxidized and Fe2+ in the reduced Na+-NQR, as deduced from the temperature dependence of spin relaxation rates of different flavin radicals. A high-spin state of iron in the Cys4[Fe] center was assigned to both forms of Na+-NQR. PMID: 29635097 [PubMed - as supplied by publisher] (Source: Journal of Inorganic Biochemistry)
Source: Journal of Inorganic Biochemistry - April 6, 2018 Category: Biochemistry Authors: Kulik LV, Bertsova YV, Bogachev AV Tags: J Inorg Biochem Source Type: research

Evolution of phosphotriesterase activities of the metallo- β-lactamase family: A theoretical study.
Evolution of phosphotriesterase activities of the metallo-β-lactamase family: A theoretical study. J Inorg Biochem. 2018 Apr 06;184:8-14 Authors: Zhang H, Yang L, Yan LF, Liao RZ, Tian WQ Abstract Metallo-β-lactamase (MβL) is a eubacterial zinc metallo-hydrolase superfamily. Despite their well-known lactamase activities, MβL family members also have the ability to catalyze phosphotriester hydrolysis with different phosphotriesterase activities. In the present study, based on crystal structure comparisons of the related MβL members, a series of models was constructed and calcul...
Source: Journal of Inorganic Biochemistry - April 6, 2018 Category: Biochemistry Authors: Zhang H, Yang L, Yan LF, Liao RZ, Tian WQ Tags: J Inorg Biochem Source Type: research

Guest editorial Keele12.
PMID: 29549913 [PubMed - in process] (Source: Journal of Inorganic Biochemistry)
Source: Journal of Inorganic Biochemistry - March 21, 2018 Category: Biochemistry Authors: Exley C Tags: J Inorg Biochem Source Type: research

Vanadium(IV)-chlorodipicolinate alleviates hepatic lipid accumulation by inducing autophagy via the LKB1/AMPK signaling pathway in vitro and in vivo.
Abstract Numerous studies have demonstrated that vanadium compounds are able to improve lipemia and triglyceridemia in both humans and animals. However, the molecular mechanism remains elusive. The present study was conducted to investigate the anti-hyperlipidemic effect of vanadium(IV) complex with 4-chlorodipicolinic acid (VOdipic-Cl)-induced autophagy on hepatic lipid accumulation. To explore the possible underlying mechanisms, primary rat hepatocytes, human hepatoma cell line HepG2, and liver tissue from C57BL/6 mice fed a high-fat diet (HFD) were used. In vitro, cultured primary rat hepatocytes were treated w...
Source: Journal of Inorganic Biochemistry - March 14, 2018 Category: Biochemistry Authors: Huang Y, Liu F, Zhang F, Liu P, Xu T, Ding W Tags: J Inorg Biochem Source Type: research

Insights from kinetic studies of photo-generated compound II models: Reactivity toward aryl sulfides.
Abstract Iron(IV)-oxo porphyrins [FeIV(Por)O] (Por = poprhyrin), commonly called compound II models, were produced in three electron-deficient ligands by visible light irradiation of highly photo-labile porphyrin-iron(III) bromates or chlorates. The kinetics of oxygen transfer atom (OAT) reactions with aryl sulfides by these photo-generated [FeIV(Por)O] (3) were studied in CH3CN solutions. The iron(IV)-oxo porphyrins under study include 5,10,15,20-tetra(2,6-dichlorophenyl)porphyrin-iron(IV)-oxo (3a), 5,10,15,20-tetra(2,6-difluorophenyl)porphyrin-iron(IV)-oxo (3b), and 5,10,15,20-tetra(pentafluorophenyl)porphyr...
Source: Journal of Inorganic Biochemistry - March 9, 2018 Category: Biochemistry Authors: Lee NF, Patel D, Liu H, Zhang R Tags: J Inorg Biochem Source Type: research

Biological evaluation of water soluble arene Ru(II) enantiomers with amino-oxime ligands.
a T, Royo E Abstract New water soluble, enantiopure arene ruthenium compound SRuSN-(1R,4S)-[(η6-p-cymene)Ru{ĸNH(Bn),ĸNOH}Cl]Cl (Bn = benzyl, 1a') has been synthesized. The novel compound along with that previously described RRuRN-(1S,4R)-[(η6-p-cymene)Ru{ĸNH(Bn),ĸNOH}Cl]Cl (1a) was evaluated by polarimetry, ultra-violet and circular dichroism spectroscopy. The structure of novel ruthenium derivative 1a' was determined by single crystal X-ray crystallography. Both enantiomers have been tested against several cancer cell lines in vitro: prostate PC-3, lung A-549, pancreas MIA PaCa-2, colorectal HCT-1...
Source: Journal of Inorganic Biochemistry - March 6, 2018 Category: Biochemistry Authors: de la Cueva-Alique I, Sierra S, Muñoz-Moreno L, Pérez-Redondo A, Bajo AM, Marzo I, Gude L, Cuenca T, Royo E Tags: J Inorg Biochem Source Type: research

Gradient coatings of strontium hydroxyapatite/zinc β-tricalcium phosphate as a tool to modulate osteoblast/osteoclast response.
Gradient coatings of strontium hydroxyapatite/zinc β-tricalcium phosphate as a tool to modulate osteoblast/osteoclast response. J Inorg Biochem. 2018 Mar 06;183:1-8 Authors: Boanini E, Torricelli P, Sima F, Axente E, Fini M, Mihailescu IN, Bigi A Abstract The chemistry, structure and morphology of the implant surface have a great influence on the integration of an implant material with bone tissue. In this work, we applied Combinatorial Matrix-Assisted Pulsed Laser Evaporation (C-MAPLE) to deposit gradient thin films with variable compositions of Sr-substituted hydroxyapatite (SrHA) and Zn-substi...
Source: Journal of Inorganic Biochemistry - March 6, 2018 Category: Biochemistry Authors: Boanini E, Torricelli P, Sima F, Axente E, Fini M, Mihailescu IN, Bigi A Tags: J Inorg Biochem Source Type: research

5,10,15,20-Tetrakis(4-sulfonatophenyl)porphyrinato iron(III) chloride (FeTPPS), a peroxynitrite decomposition catalyst, catalyzes protein tyrosine nitration in the presence of hydrogen peroxide and nitrite.
Abstract 5,10,15,20-Tetrakis(4-sulfonatophenyl)porphyrinato iron(III) chloride (FeTPPS) is a water-soluble heme analog, which has been used as a scavenger of peroxynitrite in many studies. Similar to heme, it may also possess pseudo-peroxidase activity that could cause protein tyrosine nitration through the peroxidase-H2O2-NO2- pathway. In this paper, we used western blotting and spectrophotometry analysis to study the capability of FeTPPS in catalyzing protein tyrosine nitration. Furthermore, the capability of FeTPPS in catalyzing protein nitration in tissue homogenate and cultured cells was also investigated. Ou...
Source: Journal of Inorganic Biochemistry - March 6, 2018 Category: Biochemistry Authors: Zhang P, Ma L, Yang Z, Li H, Gao Z Tags: J Inorg Biochem Source Type: research

Oxidative modification of methionine80 in cytochrome c by reaction with peroxides.
Abstract The Met80-heme iron bond of cytochrome c (cyt c) is cleaved by the interaction of cyt c with cardiolipin (CL) in membranes. The Met80 dissociation enhances the peroxidase activity of cyt c and triggers cyt c release from mitochondrion to the cytosol at the early stage of apoptosis. This paper demonstrates the selective oxidation of Met80 for the reaction of ferric cyt c with a peroxide, meta-chloroperbenzoic acid (mCPBA), in the presence of CL-containing liposomes by formation of a ferryl species (Compound I). After the reaction of cyt c with mCPBA in the presence of 1,2-dioloeyl-sn-glycero-3-phosphocholi...
Source: Journal of Inorganic Biochemistry - February 24, 2018 Category: Biochemistry Authors: Nugraheni AD, Ren C, Matsumoto Y, Nagao S, Yamanaka M, Hirota S Tags: J Inorg Biochem Source Type: research

Nickel(II) bis(isatin thiosemicarbazone) complexes induced apoptosis through mitochondrial signaling pathway and G0/G1 cell cycle arrest in IM-9 cells.
Abstract Three novel complexes (1, 3 and 4) ligating N-substituted isatin thiosemicarbazone derivatives have been synthesized and their structural and biological characteristics have been compared with those of the known analogs (2, 5-7 and 8). In addition, the structure of the representative ligands (L1, L3 and L4) and complex (4) was confirmed by single crystal X-ray diffraction method. All the complexes (1-8) were assessed for their cytotoxic property against a panel of four human cancer cells such as HepG-2 (liver), MOLM-14 (acute monocytic leukemia), U937 (histiocytic lymphoma). and IM-9 (myeloma). Complex 4 ...
Source: Journal of Inorganic Biochemistry - February 24, 2018 Category: Biochemistry Authors: Balachandran C, Haribabu J, Jeyalakshmi K, Bhuvanesh NSP, Karvembu R, Emi N, Awale S Tags: J Inorg Biochem Source Type: research

Ruthenium anticancer agent KP1019 binds more tightly than NAMI-A to tRNAPhe.
Abstract The ruthenium-based anticancer agent NAMI-A (ImH[trans-RuCl4(dmso)(Im)], where Im = imidazole) has been shown to interact with RNA in vivo and in vitro. We hypothesized that the similarly structured drug KP1019 (IndH[trans-RuCl4(Ind)2], where Ind = indazole) binds to RNA as well. Fluorescence spectroscopy was employed to assay the interactions between either NAMI-A or KP1019 and tRNAPhe through an intrinsic fluorophore wybutosine (Y) base and by extrinsic displacement of the intercalating agent ethidium bromide. In both the intrinsic Y-base and extrinsic ethidium bromide studies, KP1019 exhibited ...
Source: Journal of Inorganic Biochemistry - February 24, 2018 Category: Biochemistry Authors: Dwyer BG, Johnson E, Cazares E, McFarlane Holman KL, Kirk SR Tags: J Inorg Biochem Source Type: research