HENRYK - An endless source of metal coordination surprises.
Abstract The basic knowledge about biological inorganic chemistry, thermodynamics and metal binding sites of metalloproteins is crucial for the understanding of their metal binding-structure-function relationship. Metal-peptide complexes are useful and commonly used models of metal-enzyme active sites, among which copper and zinc models are one of the most extensively studied. HENRYK is a peptide sequence present in numerous proteins, and serves as a potentially tempting binding site for Cu(2+) and Zn(2+). Maybe more importantly, HENRYK also happens to be the first name of our group leader. The results of this wor...
Source: Journal of Inorganic Biochemistry - February 28, 2016 Category: Biochemistry Authors: Kołkowska P, Hecel A, Kędzierska D, Ostrowska M, Walencik PK, Wątły J, Zdyb K, Spodzieja M, Rodziewicz-Motowidło S, Potocki S, Łuczkowski M, Gumienna-Kontecka E, Rowińska-Żyrek M Tags: J Inorg Biochem Source Type: research

Inhibition of adhesion, migration and of α5β1 integrin in the HCT-116 colorectal cancer cells treated with the ruthenium drug NAMI-A.
Inhibition of adhesion, migration and of α5β1 integrin in the HCT-116 colorectal cancer cells treated with the ruthenium drug NAMI-A. J Inorg Biochem. 2016 Feb 27; Authors: Pelillo C, Mollica H, Eble JA, Grosche J, Herzog L, Codan B, Sava G, Bergamo A Abstract NAMI-A, imidazolium trans-imidazoledimethylsulfoxidetetrachlororuthenate, is a ruthenium-based drug characterised by the selective activity against tumour metastases. Previously we have shown the influence of the hepatic microenvironment to direct the arrest of the metastatic cells of colorectal cancer. Here we used the experimental m...
Source: Journal of Inorganic Biochemistry - February 27, 2016 Category: Biochemistry Authors: Pelillo C, Mollica H, Eble JA, Grosche J, Herzog L, Codan B, Sava G, Bergamo A Tags: J Inorg Biochem Source Type: research

Endocytosis of the tachykinin neuropeptide, neurokinin B, in astrocytes and its role in cellular copper uptake.
Abstract The tachykinin neuropeptide, neurokinin B (NKB), belongs to a family of peptides having diverse roles in the brain. NKB, along with several other tachykinins, has been identified as a copper-binding peptide, however the physiological relevance of the binding is unclear. Previously, NKB was shown to limit the ability of copper to enter astrocytes and disrupt calcium homeostasis and it was thought that the peptide was sequestering the metal extracellularly. Here we use a fluorescein-labelled NKB peptide (F-NKB) to show that NKB is not retained extracellularly, but is endocytosed within 10-20min after additi...
Source: Journal of Inorganic Biochemistry - February 27, 2016 Category: Biochemistry Authors: Shahzad R, Jones MR, Viles JH, Jones CE Tags: J Inorg Biochem Source Type: research

Water-soluble Ru(II)- and Ru(III)-halide-PTA complexes (PTA=1,3,5-triaza-7-phosphaadamantane): Chemical and biological properties.
Abstract Four structurally related Ru(II)-halide-PTA complexes, of general formula trans- or cis-[Ru(PTA)4X2] (PTA=1,3,5-triaza-7-phosphaadamantane, X=Cl (1, 2), Br (3, 4), were prepared and characterized. Whereas compounds 1 and 2 are known, the corresponding bromo derivatives 3 and 4 are new. The Ru(III)-PTA compound trans-[RuCl4(PTAH)2]Cl (5, PTAH=PTA protonated at one N atom), structurally similar to the well-known Ru(III) anticancer drug candidates (Na)trans-[RuCl4(ind)2] (NKP-1339, ind=indazole) and (Him)trans-[RuCl4(dmso-S)(im)] (NAMI-A, im=imidazole), was also prepared and similarly investigated. Notably, ...
Source: Journal of Inorganic Biochemistry - February 16, 2016 Category: Biochemistry Authors: Battistin F, Scaletti F, Balducci G, Pillozzi S, Arcangeli A, Messori L, Alessio E Tags: J Inorg Biochem Source Type: research

Glycosidase- and β-lactamase-like activity of dinuclear copper(II) patellamide complexes.
This study reports their β-lactamase as well as α- and β-glycosidase activity with kcat=(11.34±0.91)ˑ10(-4)s(-1) for β-lactamase, kcat=(1.55±0.13)ˑ10(-4)s(-1) for α-glycosidase and kcat=(1.22±0.09)ˑ10(-4)s(-1) for β-glycosidase activity. PMID: 26921720 [PubMed - as supplied by publisher] (Source: Journal of Inorganic Biochemistry)
Source: Journal of Inorganic Biochemistry - February 13, 2016 Category: Biochemistry Authors: Comba P, Eisenschmidt A, Kipper N, Schießl J Tags: J Inorg Biochem Source Type: research

A Mn(II) complex of boradiazaindacene (BODIPY) loaded graphene oxide as both LED light and H2O2 enhanced anticancer agent.
In this report, a photo-active Mn(II) complex of boradiazaindacene derivatives (Mn1) was used as a dioxygen generator under irradiation with LED light in water. Moreover, the in vitro biological evaluation for Mn1 and its loaded graphene oxide (herein called Mn1@GO) on HepG-2 cells in normal and hypoxic conditions has been performed. In particular, Mn1@GO can react with H2O2 resulting active anticancer species, which show high inhibition on both HepG-2 cells and CoCl2-treated HepG-2 cells (hypoxic cancer cells). The mechanism of LED light enhanced anticancer activity for Mn1@GO on HepG-2 cells was discussed. Our results sh...
Source: Journal of Inorganic Biochemistry - February 13, 2016 Category: Biochemistry Authors: Xu XL, Shao J, Chen QY, Li CH, Kong MY, Fang F, Ji L, Boison D, Huang T, Gao J, Feng CJ Tags: J Inorg Biochem Source Type: research

Protein-based ferrogels.
We present a novel synthesis in which hemoglobin and Fe(2+) react, in the presence of KNO3 and KOH, to produce protein microgels that contain magnetic iron oxide nanoparticles. The synthesis results in microgels with polymer properties (denaturing and glass transition temperatures) that are consistent with the dried protein. The iron oxide nanoparticles that exhibit an average diameter of 22nm, are ferrimagnetic, and display properties consistent with Fe3O4. The multiple functional capabilities displayed by these materials: biocompatibility, magnetism, dye uptake and controlled release, and other properties archetypal of h...
Source: Journal of Inorganic Biochemistry - February 12, 2016 Category: Biochemistry Authors: Mody P, Hart C, Romano S, El-Magbri M, Esson MM, Ibeh T, Knowlton ED, Zhang M, Wagner MJ, Hartings MR Tags: J Inorg Biochem Source Type: research

Unbound position II in MXCXXC metallochaperone model peptides impacts metal binding mode and reactivity: Distinct similarities to whole proteins.
Abstract The effect of position II in the binding sequence of copper metallochaperones, which varies between Thr and His, was investigated through structural analysis and affinity and oxidation kinetic studies of model peptides. A first Cys-Cu(I)-Cys model obtained for the His peptide at acidic and neutral pH, correlated with higher affinity and more rapid oxidation of its complex; in contrast, the Thr peptide with the Cys-Cu(I)-Met coordination under neutral conditions demonstrated weaker and pH dependent binding. Studies with human antioxidant protein 1 (Atox1) and three of its mutants where S residues were repl...
Source: Journal of Inorganic Biochemistry - February 12, 2016 Category: Biochemistry Authors: Shoshan MS, Dekel N, Goch W, Shalev DE, Danieli T, Lebendiker M, Bal W, Tshuva EY Tags: J Inorg Biochem Source Type: research

Topoisomerase I inhibition and DNA cleavage by zinc, copper, and nickel derivatives of 2-[2-bromoethyliminomethyl]-4-[ethoxymethyl]phenol complexes exhibiting anti-proliferation and anti-metastasis activity.
Abstract Three transition metal derivatives (Zn, Cu, and Ni) of 2-[2-bromoethyliminomethyl]-4-[ethoxymethyl]phenol (L) were synthesized by the reaction of the metal salts with the Schiff base ligand in one pot. In the crystal structure of [Zn(L)Br], the Schiff base ligand binds to the metal center through its phenolate oxygen and imine nitrogen, and adopts a distorted tetrahedral geometry. These compounds were found to inhibit topoisomerase I (topo I) activity, induce DNA cleavage and show DNA binding activity. Moreover, these compounds were found to be cytotoxic towards several cancer cell lines (A2780, MCF-7, HT...
Source: Journal of Inorganic Biochemistry - February 11, 2016 Category: Biochemistry Authors: Lee SK, Tan KW, Ng SW Tags: J Inorg Biochem Source Type: research

Preparation, optical and electrochemical properties, and molecular orbital calculations of tetraazaporphyrinato ruthenium (II) bis(4-methylpyridine) fused with one to four diphenylthiophene units.
Abstract 2,5-Diphenyl-3,4-dicyanothiophene (1) and phthalonitrile (2) were mixed and treated with ruthenium (III) trichloride, 4-methylpyridine, and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in 2-ethoxyethanol at 135°C, to produce low-symmetrical tetraazaporphyrins (TAPs) (3), (4), (5), and (6) with one to three thiophene rings. Two thiophene-annelated tetraazaporphyrins were isolated as opposite and adjacent isomers 4 and 5. The structure of 3 was determined by X-ray crystallography, showing that the thiophene ring linked at the 3,4-positions on the tetraazaporphyrin scaffold deviates from the mean plane of th...
Source: Journal of Inorganic Biochemistry - January 28, 2016 Category: Biochemistry Authors: Kimura T, Murakami N, Suzuki E, Furuyama T, Nakahodo T, Fujihara H, Kobayashi N Tags: J Inorg Biochem Source Type: research

Synthesis, characterization, in vitro cytotoxicity and anticancer effects of ruthenium(II) complexes on BEL-7402 cells.
Abstract Four new ruthenium(II) polypyridyl complexes [Ru(dmb)2(DQTT)](ClO4)2 (1) (DQTT=12-(1,4-dihydroquinoxalin-6-yl)-4,5,9,14-tetraazabenzo[b]triphenylene, dmb=4,4'-dimethyl-2,2'-bipyridine), [Ru(bpy)2(DQTT)](ClO4)2 (2) (bpy=2,2'-bipyridine), [Ru(phen)2(DQTT)](ClO4)2 (3) (phen=1,10-phenanthroline) and [Ru(dmp)2(DQTT)](ClO4)2 (4) (dmp=2,9-dimethyl-1,10-phenanthroline) were synthesized and characterized by elemental analysis, ESI-MS, (1)H NMR and (13)C NMR. The cytotoxic activity in vitro of the complexes was evaluated against human BEL-7402, A549, HeLa, HepG-2 and MG-63 cancer cell lines by MTT (3-(4,5-dimethylt...
Source: Journal of Inorganic Biochemistry - January 22, 2016 Category: Biochemistry Authors: Zhang C, Han BJ, Zeng CC, Lai SH, Li W, Tang B, Wan D, Jiang GB, Liu YJ Tags: J Inorg Biochem Source Type: research

Bovine serum albumin binding, antioxidant and anticancer properties of an oxidovanadium(IV) complex with luteolin.
ms PA Abstract Chemotherapy using metal coordination compounds for cancer treatment is the work of the ongoing research. Continuing our research on the improvement of the anticancer activity of natural flavonoids by metal complexation, a coordination compound of the natural antioxidant flavone luteolin (lut) and the oxidovanadium(IV) cation has been synthesized and characterized. Using different physicochemical measurements some structural aspects of [VO(lut)(H2O)2]Na·3H2O (VOlut) were determined. The metal coordinated to two cis-deprotonated oxygen atoms (ArO(-)) of the ligand and two H2O molecules. Magnet...
Source: Journal of Inorganic Biochemistry - January 22, 2016 Category: Biochemistry Authors: Naso LG, Lezama L, Valcarcel M, Salado C, Villacé P, Kortazar D, Ferrer EG, Williams PA Tags: J Inorg Biochem Source Type: research

Complexation and molecular modeling studies of europium(III)-gallic acid-amino acid complexes.
Abstract With many metal-based drugs extensively used today in the treatment of cancer, attention has focused on the development of new coordination compounds with antitumor activity with europium(III) complexes recently introduced as novel anticancer drugs. The aim of this work is to design new Eu(III) complexes with gallic acid, an antioxida'nt phenolic compound. Gallic acid was chosen because it shows anticancer activity without harming health cells. As antioxidant, it helps to protect human cells against oxidative damage that implicated in DNA damage, cancer, and accelerated cell aging. In this work, the forma...
Source: Journal of Inorganic Biochemistry - January 21, 2016 Category: Biochemistry Authors: Taha M, Khan I, Coutinho JA Tags: J Inorg Biochem Source Type: research

The structures, cytotoxicity, apoptosis and molecular docking controlled by the aliphatic chain of palladium(II) complexes.
Abstract A new series of Pd(II) complexes derived from benzenealkyl dicarboxylate ligands, [Pd(Ln)(phen)] (phen=2,9-dimethyl-1,10-phenanthroline, complex 1: L1=phenylmalonate; complex 2: L2=benzylmalonate; complex 3: L3=(2-phenylethyl)malonate; complex 4: L4=(3-phenylpropyl)malonate) have been synthesized under room temperature condition. These complexes contain a long dicarboxylate aliphatic chain. They were characterized by elemental analysis, infrared spectroscopy, single crystal X-ray diffraction. The binding of complexes with fish sperm DNA (FS-DNA) was investigated by UV absorption and fluorescence spectra. ...
Source: Journal of Inorganic Biochemistry - January 21, 2016 Category: Biochemistry Authors: Zhu M, Cui X, Zhang S, Liu L, Han Z, Gao E Tags: J Inorg Biochem Source Type: research

Apomaghemite as a doxorubicin carrier for anticancer drug delivery.
, Gálvez N Abstract Protein cages have well-defined structures and can be chemically and biologically engineered in many ways, making them useful platforms for drug delivery applications. Taking advantage of the unique structure feature of apoferritin, a new theranostic nanocarrier is proposed herein. The apoferritin protein is effective for the encapsulation of maghemite nanoparticles and for loading a significant dose of doxorubicin (DOX) drug. This simultaneous loading of maghemite nanoparticles and DOX has been achieved using either co-encapsulation or surface-binding approaches. Maghemite nanoparticles...
Source: Journal of Inorganic Biochemistry - January 21, 2016 Category: Biochemistry Authors: Jurado R, Frączek P, Droetto M, Sánchez P, Valero E, Domínguez-Vera JM, Gálvez N Tags: J Inorg Biochem Source Type: research

Catalytic reduction of dioxygen with modified Thermus thermophilus cytochrome c552.
Abstract Efficient catalysis of the oxygen reduction reaction (ORR) is of central importance to function in fuel cells. Metalloproteins, such as laccase (Cu) or cytochrome c oxidase (Cu/Fe-heme) carry out the 4H(+)/4e(-) reduction quite efficiently, but using large, complex protein frameworks. Smaller heme proteins also can carry out ORR, but less efficiently. To gain greater insight into features that promote efficient ORR, we expressed, characterized, and investigated the electrochemical behavior of six new mutants of cytochrome c552 from Thermus thermophilus: V49S/M69A, V49T/M69A, L29D/V49S/M69A, P27A/P28A/L29D...
Source: Journal of Inorganic Biochemistry - January 20, 2016 Category: Biochemistry Authors: Husband J, Aaron MS, Bains RK, Lewis AR, Warren JJ Tags: J Inorg Biochem Source Type: research

Toward a better understanding of the oxaliplatin mode of action upon the steric hindrance of 1,2-diaminocyclohexane and its analogue.
Abstract The present research is concerned with the mechanism investigation on the interaction between oxaliplatin and guanosine 5'-monophosphate (GMP) in the presence of glutathione (GSH). The binding modes of oxaliplatin with GMP and GSH were explored by HPLC and LC-MS techniques, respectively, in which four key intermediates were found and five adducts were determined in the reaction. The results indicated that GSH can interfere with the reaction between oxaliplatin and DNA in two ways. One is by competing with GMP to bind the active platinum unit, and the other is by substituting the guanine-N7 atom of DNA to ...
Source: Journal of Inorganic Biochemistry - January 15, 2016 Category: Biochemistry Authors: Wang Z, Wu M, Gou S Tags: J Inorg Biochem Source Type: research

Synthesis, characterization and biological evaluation of novel Ru(II)-arene complexes containing intercalating ligands.
pka S Abstract Three new ruthenium(II)-arene complexes, namely [(η(6)-p-cymene)Ru(Me2dppz)Cl]PF6 (1), [(η(6)-benzene)Ru(Me2dppz)Cl]PF6 (2) and [(η(6)-p-cymene)Ru(aip)Cl]PF6 (3) (Me2dppz=11,12-dimethyldipyrido[3,2-a:2',3'-c]phenazine; aip=2-(9-anthryl)-1H-imidazo[4,5-f] [1,10] phenanthroline) have been synthesized and characterized using different spectroscopic techniques including elemental analysis. The complexes were found to be well soluble and stable in DMSO. The biological activity of the three complexes was tested in three different human cancer cell lines (A549, MDA-MB-231 and HeLa) and in one h...
Source: Journal of Inorganic Biochemistry - January 11, 2016 Category: Biochemistry Authors: Nikolić S, Rangasamy L, Gligorijević N, Aranđelović S, Radulović S, Gasser G, Grgurić-Šipka S Tags: J Inorg Biochem Source Type: research

ATOX1 gene silencing increases susceptibility to anticancer therapy based on copper ionophores or chelating drugs.
Abstract Copper is a catalytic cofactor required for the normal function of many enzymes involved in fundamental biological processes but highly cytotoxic when in excess. Therefore its homeostasis and distribution is strictly regulated by a network of transporters and intracellular chaperones. ATOX1 (antioxidant protein 1) is a copper chaperone that plays a role in copper homeostasis by binding and transporting cytosolic copper to ATPase proteins in the trans-Golgi network. In the present study the Caco-2 cell line, a colon carcinoma cell line, was used as an in vitro model to evaluate if ATOX1 deficiency could af...
Source: Journal of Inorganic Biochemistry - January 11, 2016 Category: Biochemistry Authors: Barresi V, Spampinato G, Musso N, Trovato Salinaro A, Rizzarelli E, Condorelli DF Tags: J Inorg Biochem Source Type: research

One-dimensional chiral copper (II) complexes with novel nano-structures and superior antitumor activity.
Abstract Three novel copper(II) compounds of formulas {[Cu(Phen)(Ala)]·NO3·H2O}n (1), {[Cu(Phen)(Ala)]·NO3}n (2) and [Cu(Ala)2]n (3) have been synthesized and determined by X-ray diffraction. 1 and 2 are shown in one dimensional long-chain chiral structures, and 3 is a two dimensional checkerboard-type structure. Both 1 and 2 displayed a higher anticancer activity than 3 against various cancer cells, even higher than the similar mononuclear complexes and clinical anticancer drug 5-fluorouracil. The noncancerous cell lines (CCC-HEL-1) have showed that complexes 1-3 have hardly any cytotoxicity....
Source: Journal of Inorganic Biochemistry - January 11, 2016 Category: Biochemistry Authors: Zhang WC, Tang X, Lu X Tags: J Inorg Biochem Source Type: research

Distinct mechanisms for DNA cleavage by myoglobin with a designed heme active center.
This study provides valuable insights into the distinct mechanisms for DNA cleavage by heme proteins, and lays down a base for creating artificial DNA endonucleases by rational design of heme proteins. Moreover, this study suggests that the diverse functions of heme proteins can be fine-tuned by rational design of the heme active center with a hydrogen-bonding network. PMID: 26775281 [PubMed - as supplied by publisher] (Source: Journal of Inorganic Biochemistry)
Source: Journal of Inorganic Biochemistry - January 11, 2016 Category: Biochemistry Authors: Zhao Y, Du KJ, Gao SQ, He B, Wen GB, Tan X, Lin YW Tags: J Inorg Biochem Source Type: research

Dinuclear ruthenium complexes display loop isomer selectivity to c-MYC DNA G-quadriplex and exhibit anti-tumour activity.
Abstract G-quadruplex DNA, especially the cellular-myelocytomatosis viral oncogene (c-MYC) is closely associated with cell-cycle regulation, proliferation of tumour cells. In this work, the interaction between the c-MYC and two dinuclear Ru(II) complexes [(bpy)2Ru(bpibp)Ru(bpy)2](ClO4)4 (compound 1) and [(phen)2Ru(bpibp)Ru(phen)2](ClO4)4 (compound 2) have been studied. The data from UV-Visible, PCR-stop and Fluorescence resonance energy transfer (FRET) showed that two complexes can stabilize the structure of G-quadruplex in the c-MYC promoter and targeting the G-quadruplex loop isomers. Interestingly, the complex ...
Source: Journal of Inorganic Biochemistry - January 11, 2016 Category: Biochemistry Authors: Zheng C, Liu Y, Liu Y, Qin X, Zhou Y, Liu J Tags: J Inorg Biochem Source Type: research

The use of isomeric testosterone dimers to explore allosteric effects in substrate binding to cytochrome P450 CYP3A4.
Kincaid JR Abstract Cytochrome P450 CYP3A4 is the main drug-metabolizing enzyme in the human liver, being responsible for oxidation of 50% of all pharmaceuticals metabolized by human P450 enzymes. Possessing a large substrate binding pocket, it can simultaneously bind several substrate molecules and often exhibits a complex pattern of drug-drug interactions. In order to better understand structural and functional aspects of binding of multiple substrate molecules to CYP3A4 we used resonance Raman and UV-VIS spectroscopy to document the effects of binding of synthetic testosterone dimers of different configuration...
Source: Journal of Inorganic Biochemistry - December 31, 2015 Category: Biochemistry Authors: Denisov IG, Mak PJ, Grinkova YV, Bastien D, Bérubé G, Sligar SG, Kincaid JR Tags: J Inorg Biochem Source Type: research

The studies on the cytotoxicity in vitro, cellular uptake, cell cycle arrest and apoptosis-inducing properties of ruthenium methylimidazole complex [Ru(MeIm)4(p-cpip)](2.)
Abstract A new ruthenium methylimidazole complex [Ru(MeIm)4(p-cpip)](2+) (Ru1, p-cpip=2-(4-chlorophenyl)-1H-imidazo[4,5-f][1,10]phenanthroline, MeIm=1-methylimidazole) has been synthesized and characterized. The cellular uptake, in vitro cytotoxicities, cell cycle arrest and apoptosis-inducing mechanism of this Ru(II) complex have been extensively explored by Inductively Coupled Plasma Mass Spectrometry (ICP-MS), 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, flow cytometry, Comet assay, inverted fluorescence microscope as well as Western blotting experimental techniques. Notably, Ru1 di...
Source: Journal of Inorganic Biochemistry - December 31, 2015 Category: Biochemistry Authors: Chen LM, Peng F, Li GD, Jie XM, Cai KR, Cai C, Zhong Y, Zeng H, Li W, Zhang Z, Chen JC Tags: J Inorg Biochem Source Type: research

Selective binding and magnetic separation of histidine-tagged proteins using Fe3O4/Cu-apatite nanoparticles.
Abstract Hierarchical Fe3O4@Cu-apatite nanoparticles (NPs) were synthesized via a facile hydrothermal method. The Fe3O4 cores present spherical shape and have a mean diameter of 300nm, and the Cu-apatite shell with thickness of about 50nm is composed of a large number of sheets. Using the high affinity of Cu(2+) on the surface toward histidine tags, the Fe3O4@Cu-apatite NPs can be applied to enrich and magnetically separate histidine tagged (His-tagged) proteins directly from the mixture of lysed cells. Research results indicated that the Fe3O4@Cu-apatite NPs presented negligible nonspecific protein adsorption and...
Source: Journal of Inorganic Biochemistry - December 30, 2015 Category: Biochemistry Authors: Li P, Li L, Zhao Y, Sun L, Zhang Y Tags: J Inorg Biochem Source Type: research

Comparative Raman study of four plant metallothionein isoforms: Insights into their Zn(II) clusters and protein conformations.
In conclusion, this work illustrates the attractive potential of Raman spectroscopy, combined with other techniques, to be a very informative tool for evidencing structural differences among in vivo synthesized metal-MT complexes. PMID: 26775276 [PubMed - as supplied by publisher] (Source: Journal of Inorganic Biochemistry)
Source: Journal of Inorganic Biochemistry - December 30, 2015 Category: Biochemistry Authors: Tomas M, Tinti A, Bofill R, Capdevila M, Atrian S, Torreggiani A Tags: J Inorg Biochem Source Type: research

Synthesis and structure elucidation of new μ-oxamido-bridged dicopper(II) complexes showing in vitro anticancer activity: Evaluation of DNA/protein-binding properties by experiment and molecular docking.
Synthesis and structure elucidation of new μ-oxamido-bridged dicopper(II) complexes showing in vitro anticancer activity: Evaluation of DNA/protein-binding properties by experiment and molecular docking. J Inorg Biochem. 2015 Dec 30;156:75-88 Authors: Zheng K, Liu F, Li YT, Wu ZY, Yan CW Abstract Two new μ-oxamido-bridged dicopper(II) complexes formulated as [Cu2(hmdoxd)(H2O)(Me2bpy)]-(ClO4)·DMF (1) and [Cu2(hmdoxd)(bpy)](ClO4)·CH3OH (2), where H3hmdoxd is N-(2-hydroxy-5-methylphenyl)-N'-[2-(dimethylamino)ethyl]oxamide; Me2bpy and bpy stand for 4,4'-dimethyl-2,2'-bipyridine and 2,2...
Source: Journal of Inorganic Biochemistry - December 30, 2015 Category: Biochemistry Authors: Zheng K, Liu F, Li YT, Wu ZY, Yan CW Tags: J Inorg Biochem Source Type: research

Structural and functional effects of benzimidazole/thioether-copper complexes with antitumor activity on cell membranes and molecular models.
nzález-Ugarte AK Abstract Two cytotoxic copper(II) complexes with N-H and N-methylated benzimidazole-derived ligands (Cu-L(2) and Cu-L(2Me)) were synthesized and made to interact with human erythrocytes and molecular models of their plasmatic membranes. The latter consisted in lipid bilayers of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE), lipids of the types present in the outer and inner monolayers of the human erythrocyte membrane, respectively. Initial assessment of the interaction of the complexes with DMPC and DMPE consisted of X-ray diffraction studies, which s...
Source: Journal of Inorganic Biochemistry - December 30, 2015 Category: Biochemistry Authors: Castillo I, Suwalsky M, Gallardo MJ, Troncoso V, Sánchez-Eguía BN, Santiago-Osorio E, Aguiñiga I, González-Ugarte AK Tags: J Inorg Biochem Source Type: research

Characterization of the full-length btuB riboswitch from Klebsiella pneumoniae.
ver M Abstract Riboswitches are cis-regulatory RNA elements on the mRNA level that control the expression of the downstream coding region. The interaction of the riboswitch with its specific metabolite, which is related to the function of the controlled gene, induces a structural change of the RNA architecture. Consequently, gene regulation is induced by un/masking of the ribosome binding site (RBS). In the genome of Klebsiella pneumoniae a sequence was identified by bioinformatics and proposed to be a B12 riboswitch regulated by coenzyme B12. Here we study this new coenzyme B12-dependent riboswitch system by in-l...
Source: Journal of Inorganic Biochemistry - December 21, 2015 Category: Biochemistry Authors: Palou-Mir J, Musiari A, Sigel RK, Barceló-Oliver M Tags: J Inorg Biochem Source Type: research

New antibacterial, non-genotoxic materials, derived from the functionalization of the anti-thyroid drug methimazole with silver ions.
In conclusion the silver complex 1 is an anti-bacterial and non-genotoxic material, which can be applied to antibacterial drug in the future. PMID: 26765999 [PubMed - as supplied by publisher] (Source: Journal of Inorganic Biochemistry)
Source: Journal of Inorganic Biochemistry - December 19, 2015 Category: Biochemistry Authors: Sainis I, Banti CN, Owczarzak AM, Kyros L, Kourkoumelis N, Kubicki M, Hadjikakou SK Tags: J Inorg Biochem Source Type: research

Dimerization and DNA recognition rules of mithramycin and its analogues.
Abstract The antineoplastic and antibiotic natural product mithramycin (MTM) is used against cancer-related hypercalcemia and, experimentally, against Ewing sarcoma and lung cancers. MTM exerts its cytotoxic effect by binding DNA as a divalent metal ion (Me(2+))-coordinated dimer and disrupting the function of transcription factors. A precise molecular mechanism of action of MTM, needed to develop MTM analogues selective against desired transcription factors, is lacking. Although it is known that MTM binds G/C-rich DNA, the exact DNA recognition rules that would allow one to map MTM binding sites remain incomplete...
Source: Journal of Inorganic Biochemistry - December 18, 2015 Category: Biochemistry Authors: Weidenbach S, Hou C, Chen JM, Tsodikov OV, Rohr J Tags: J Inorg Biochem Source Type: research

Evaluation of employing poly-lysine tags versus poly-histidine tags for purification and characterization of recombinant copper-binding proteins.
Abstract Quantitative characterization of metalloproteins at molecular and atomic levels generally requires tens of milligrams of highly purified samples, a situation frequently challenged by problems in generating unmodified native forms. A variety of affinity tags, such as the popular poly-histidine tag, have been developed to facilitate purification but they generally rely on expensive affinity resins and their presence may interfere with protein characterization. This paper documents that addition of a poly-lysine tag to the C-terminus enables, for the copper-binding proteins examined, ready purification in la...
Source: Journal of Inorganic Biochemistry - December 18, 2015 Category: Biochemistry Authors: Wijekoon CJ, Ukuwela AA, Wedd AG, Xiao Z Tags: J Inorg Biochem Source Type: research

The inhibition of glycerol permeation through aquaglyceroporin-3 induced by mercury(II): A molecular dynamics study.
Abstract Mercurial compounds are known to inhibit water permeation through aquaporins (AQPs). Although in the last years some hypotheses were proposed, the exact mechanism of inhibition is still an open question and even less is known about the inhibition of the glycerol permeation through aquaglyceroporins. Molecular dynamics (MD) simulations of human aquaporin-3 (AQP3) have been performed up to 200ns in the presence of Hg(2+) ions. For the first time, we have observed the unbiased passage of a glycerol molecule from the extracellular to cytosolic side. Moreover, the presence of Hg(2+) ions covalently bound to Cy...
Source: Journal of Inorganic Biochemistry - December 18, 2015 Category: Biochemistry Authors: Spinello A, de Almeida A, Casini A, Barone G Tags: J Inorg Biochem Source Type: research

Simultaneous biosynthesis of putrebactin, avaroferrin and bisucaberin by Shewanella putrefaciens and characterisation of complexes with iron(III), molybdenum(VI) or chromium(V).
Abstract Cultures of Shewanella putrefaciens grown in medium containing 10mM 1,4-diamino-2-butanone (DBO) as an inhibitor of ornithine decarboxylase and 10mM 1,5-diaminopentane (cadaverine) showed the simultaneous biosynthesis of the macrocyclic dihydroxamic acids: putrebactin (pbH2), avaroferrin (avH2) and bisucaberin (bsH2). The level of DBO did not completely repress the production of endogenous 1,4-diaminobutane (putrescine) as the native diamine substrate of pbH2. The relative concentration of pbH2:avH2:bsH2 was 1:2:1, which correlated with the substrate selection of putrescine:cadaverine in a ratio of 1:1. T...
Source: Journal of Inorganic Biochemistry - December 17, 2015 Category: Biochemistry Authors: Soe CZ, Telfer TJ, Levina A, Lay PA, Codd R Tags: J Inorg Biochem Source Type: research

Prediction of logP for Pt(II) and Pt(IV) complexes: Comparison of statistical and quantum-chemistry based approaches.
This study addresses an issue with the absence of publicly available models to predict logP of Pt(IV) complexes. Following data collection and subsequent development of models based on 187 complexes from literature, we validate new and previously published models on a new set of 11 Pt(II) and 35 Pt(IV) complexes, which were kept blind during the model development step. The error of the consensus model, 0.65 for Pt(IV) and 0.37 for Pt(II) complexes, indicates its good accuracy of predictions. The lower accuracy for Pt(IV) complexes was attributed to experimental difficulties with logP measurements for some poorly-soluble co...
Source: Journal of Inorganic Biochemistry - December 11, 2015 Category: Biochemistry Authors: Tetko IV, Varbanov HP, Galanski M, Talmaciu M, Platts JA, Ravera M, Gabano E Tags: J Inorg Biochem Source Type: research

Chromogenic nitrophenolate-based substrates for light-driven hybrid P450 BM3 enzyme assay.
Abstract The incorporation of a p-nitrophenoxy moiety in substrates has enabled the development of colorimetric assays to rapidly screen for O-demethylation activity of P450 enzymes. For the light-driven hybrid P450 BM3 enzymes, where a Ru(II) photosensitizer powers the enzyme upon visible light irradiation, we have investigated a family of p-nitrophenoxy derivatives as useful chromogenic substrates compatible with the light-driven approach. The validation of this assay and its adaptability to a 96-well plate format will enable the screening of the next generation of hybrid P450 BM3 enzymes towards C-H bond functi...
Source: Journal of Inorganic Biochemistry - December 10, 2015 Category: Biochemistry Authors: Lam Q, Cortez A, Nguyen TT, Kato M, Cheruzel L Tags: J Inorg Biochem Source Type: research

Palladium(II) complexes with tris(2-carboxyethyl)phosphine, structure, reactions and cytostatic activity.
Abstract Water soluble and air stable P(RCOOH)3 (R=C2H4) (TCEP) is an efficient reducing agent used in biochemistry to break S-S bond in peptides, proteins and other compounds containing S-S bonds. The similarity between the coordination chemistry of Pd(II) and Pt(II) led to the investigations of antitumor activity of palladium(II) compounds however the Pd(II) complexes with TCEP were not investigated. New palladium(II) complexes with (TCEP): trans-[PdCl2(TCEP)2] (1) and trans-[Pd2(μ-Cl)2Cl2(TCEP)2] (2) were fully characterized by (1)H, (13)C, (31)P NMR, IR and ESI-MS spectroscopic techniques. Complexes are sta...
Source: Journal of Inorganic Biochemistry - December 9, 2015 Category: Biochemistry Authors: Pruchnik H, Lis T, Latocha M, Zielińska A, Pruchnik FP Tags: J Inorg Biochem Source Type: research

Novel enantiopure cyclopentadienyl Ti(IV) oximato compounds as potential anticancer agents.
oyo E Abstract The synthesis and characterization of new enantiopure cyclopentadienyl titanium oximato compounds (S,R)-[(η(5)-C5H5)Ti{к(2)NO,(R)NH·HCl}Cl2] (R=Ph (phenyl) 1a·HCl, Bn (benzyl) 1b·HCl, 2-pic (2-picolyl) 1c·HCl), (S,R)-[(η(5)-C5H5)TiCl2{к(2)NO,(Ph)NH}] (1a) and (S,R)-[(η(5)-C5H5)2TiCl{к(2)NO,(R)NH}] (R=Ph 2a, Bn 2b, 2-pic 2c), along with studies on their behavior in D2O at different pD values are reported. The structure of previously described ammonium-oxime (2S,5R)-{NOH,(Bn)NH·HCl} (b·HCl) and novel titanium derivative 1a have been determined b...
Source: Journal of Inorganic Biochemistry - December 9, 2015 Category: Biochemistry Authors: de la Cueva-Alique I, Muñoz-Moreno L, Benabdelouahab Y, Elie BT, El Amrani MA, Mosquera ME, Contel M, Bajo AM, Cuenca T, Royo E Tags: J Inorg Biochem Source Type: research

Interaction of metallacrown complexes with G-quadruplex DNA.
Abstract Interactions of the G-quadruplex (GQ) DNA with two pentacoordinate lanthanide (III) metallacrown (MC) complexes containing phenylalanine hydroxamic acid (pheHA) and copper(II) ions of the formula Eu 15-[MCCu,pheHA]-5 (1) and Tb 15-[MCCu,pheHA]-5 (2) were investigated. Binding of both metallacrowns to human telomeric G-quadruplex DNA was followed using CD spectroscopy, DNA melting profiles, and fluorescent intercalator displacement (FID) assay. A new G-quadruplex binding assay based of quenching of Tb(III)-GQ luminescence was proposed and evaluated. All performed tests confirmed interactions of MCs with st...
Source: Journal of Inorganic Biochemistry - December 2, 2015 Category: Biochemistry Authors: Rajczak E, Gluszynska A, Juskowiak B Tags: J Inorg Biochem Source Type: research

Silver(I) complexes with phthalazine and quinazoline as effective agents against pathogenic Pseudomonas aeruginosa strains.
nic J Abstract Five silver(I) complexes with aromatic nitrogen-containing heterocycles, phthalazine (phtz) and quinazoline (qz), were synthesized, characterized and analyzed by single-crystal X-ray diffraction analysis. Although different AgX salts reacted with phtz, only dinuclear silver(I) complexes of the general formula {[Ag(X-O)(phtz-N)]2(μ-phtz-N,N')2} were formed, X=NO3(-) (1), CF3SO3(-) (2) and ClO4(-) (3). However, reactions of qz with an equimolar amount of AgCF3SO3 and AgBF4 resulted in the formation of polynuclear complexes, {[Ag(CF3SO3-O)(qz-N)]2}n (4) and {[Ag(qz-N)][BF4]}n (5). Complexes 1-5 were...
Source: Journal of Inorganic Biochemistry - December 2, 2015 Category: Biochemistry Authors: Glišić BĐ, Senerovic L, Comba P, Wadepohl H, Veselinovic A, Milivojevic DR, Djuran MI, Nikodinovic-Runic J Tags: J Inorg Biochem Source Type: research

Palladium-benzodiazepine derivatives as promising metallodrugs for the development of antiepileptic therapies.
VR, Meneghetti MR Abstract We synthesized two organometallic diazepam-palladium(II) derivatives by C-H activation of diazepam (DZP) with palladium salts, i.e., PdCl2 and Pd(OAc)2 (OAc=acetate). Both compounds obtained are air stable and were isolated in good yields. The anticonvulsant potential of the complexes, labeled [(DZP)PdCl]2 and [(DZP)PdOAc]2, was evaluated through two animal models: pentylenetetrazole (PTZ)- and picrotoxin (PTX)-induced convulsions. The organometallic DZP-palladium(II) acetate complex, [(DZP)PdOAc]2, significantly increased (p
Source: Journal of Inorganic Biochemistry - December 2, 2015 Category: Biochemistry Authors: Barros WB, da Silva AH, Barbosa AS, Nunes ÁM, Reys JR, de Araújo-Filho HG, de Souza Siqueira Quintans J, Quintans-Júnior LJ, Pfeffer M, Dos Santos Malta VR, Meneghetti MR Tags: J Inorg Biochem Source Type: research

Synthesis of platinum complexes with 2-(5-perfluoroalkyl-1,2,4-oxadiazol-3yl)-pyridine and 2-(3-perfluoroalkyl-1-methyl-1,2,4-triazole-5yl)-pyridine ligands and their in vitro antitumor activity.
Abstract Five new mononuclear Pt(II) complexes with 5-perfluoroalkyl-1,2,4-oxadiazolyl-pyridine and 3-perfluoroalkyl-1,2,4-triazolyl-pyridine ligands are reported. The ligands 2-(5-perfluoroheptyl-1,2,4-oxadiazole-3yl)-pyridine (pfhop), 2-(5-perfluoropropyl)-1,2,4-oxadiazole-3yl)-pyridine (pfpop), 2-(3-perfluoroheptyl-1-methyl-1,2,4-triazole-5yl)-pyridine (pfhtp), 2-(3-perfluoropropyl-1-methyl-1,2,4-triazole-5yl)-pyridine (pfptp) and their complexes [PtCl2(pfhop)2]·1.5 DMSO (2a), [PtCl2(pfpop)2]·1.5 DMSO (3a), [PtCl2(pfhtp)2]·1.5 DMSO (4a), PtCl2(pfhtp) (4b), [PtCl2(pfptp)2]·1.5 DMSO (5...
Source: Journal of Inorganic Biochemistry - November 27, 2015 Category: Biochemistry Authors: Rubino S, Pibiri I, Costantino C, Buscemi S, Girasolo MA, Attanzio A, Tesoriere L Tags: J Inorg Biochem Source Type: research

Effect of concomitant oxidation and deprotonation of hydrated Mn centres in rationalising the FTIR difference silence of D1-Asp170 in Photosystem II.
Abstract The observation of negligible FTIR differences in carboxylate vibrational modes for the D1-Asp170 residue of Photosystem II (PSII) on successive one-electron oxidations of the Mn4CaO5 oxygen-evolving complex (OEC) is counterintuitive in light of the apparent ligation of D1-Asp170 to an oxidisable Mn ion in the X-ray crystallographic structures of PSII. Here, we show computational support for the hypothesis that suppression of the FTIR difference spectrum in the 1100cm(-1) to 1700cm(-1) region of D1-Asp170 occurs by concomitant Mn oxidation and deprotonation of water ligands bound to the ligated metal cent...
Source: Journal of Inorganic Biochemistry - November 25, 2015 Category: Biochemistry Authors: Terrett R, Frankcombe T, Pace R, Stranger R Tags: J Inorg Biochem Source Type: research

Tracking live cell response to cadmium (II) concentrations by scanning electrochemical microscopy.
In this study, scanning electrochemical microscopy (SECM) was used as a noninvasive technique to monitor membrane permeability of single live human bladder cancer cells (T24) subjected to exposure of Cd (II) at various concentrations. The addition of a membrane permeable redox mediator, ferrocenemethanol (FcMeOH), in combination with depth scan imaging provided probe approach curves (PACs) to reveal changes in membrane homeostasis. To demonstrate the strength of SECM as a bioanalytical technique for cell physiology and pathology, we tested responses of live cells after 1h incubations with various concentrations of Cd (II)....
Source: Journal of Inorganic Biochemistry - November 23, 2015 Category: Biochemistry Authors: Henderson JD, Filice FP, Li MS, Ding Z Tags: J Inorg Biochem Source Type: research

Structure-function relationships in human cytochrome c: The role of tyrosine 67.
Abstract Spectroscopic and functional properties of human cytochrome c and its Tyr67 residue mutants (i.e., Tyr67His and Tyr67Arg) have been investigated. In the case of the Tyr67His mutant, we have observed only a very limited structural alteration of the heme pocket and of the Ω-loop involving, among others, the residue Met80 and its bond with the heme iron. Conversely, in the Tyr67Arg mutant the Fe-Met80 bond is cleaved; consequently, a much more extensive structural alteration of the Ω-loop can be envisaged. The structural, and thus the functional modifications, of the Tyr67Arg mutant are present i...
Source: Journal of Inorganic Biochemistry - November 12, 2015 Category: Biochemistry Authors: Tognaccini L, Ciaccio C, D'Oria V, Cervelli M, Howes BD, Coletta M, Mariottini P, Smulevich G, Fiorucci L Tags: J Inorg Biochem Source Type: research

Synthesis, crystal structure, DNA and protein binding studies of novel binuclear Pd(II) complex of 6-methoxy-2-oxo-1,2-dihydroquinoline-3-carbaldehyde-4(N,N)-dimethylthiosemicarbazone.
Abstract A novel binuclear palladium(II) complex [(AsPh3)2ClPd(L)PdCl] (LPd2) has been synthesized by reacting 2-oxo-1,2-dihydroquinoline-3-carbaldehyde-4(N,N)-dimethylthiosemicarbazone (HL) with [PdCl2(AsPh3)2], and the molecular structure was confirmed by single crystal X-ray diffraction studies. The DNA interactions of the free ligand and of the complex have been evaluated by absorption and ethidium bromide (EB) competitive studies which revealed that the complex could interact with calf thymus DNA (CT-DNA) through intercalation. In addition, the interactions with bovine serum albumin (BSA) were also studied sh...
Source: Journal of Inorganic Biochemistry - November 11, 2015 Category: Biochemistry Authors: Eswaran R, Bertani R, Sgarbossa P, Karuppannan N, Nattamai S P B Tags: J Inorg Biochem Source Type: research

Uncovering novel 3-hydroxy-4-pyridinone metal ion complexes with potential anti-inflammatory properties.
des E Abstract Ligands of the 3-hydroxy-4-pyridinone (3,4-HPO) type, with one (Hmpp) or two methyl groups (Hdmpp), have been reported to possess biomedical, chemical and analytical applications. In this first screening study aiming to uncover new promising agents to mitigate the oxidative damage highly present in several metabolic disorders, such as diabetes mellitus, we assessed the potential of twelve 3,4-HPO metal ion complexes to modulate oxidative burst in human neutrophils. Metal ion 3,4-HPO complexes of Ni, Fe, V, Co, Cu and Zn were synthesized and tested up to 15μM. Among all the compounds, [Cu(mpp)2] a...
Source: Journal of Inorganic Biochemistry - November 11, 2015 Category: Biochemistry Authors: Chisté RC, Ribeiro D, Freitas M, Leite A, Moniz T, Rangel M, Fernandes E Tags: J Inorg Biochem Source Type: research

Water soluble heterometallic potassium-dioxidovanadium(V) complexes as potential antiproliferative agents.
PMID: 26606289 [PubMed - as supplied by publisher] (Source: Journal of Inorganic Biochemistry)
Source: Journal of Inorganic Biochemistry - November 11, 2015 Category: Biochemistry Authors: Sutradhar M, Fernandes AR, Silva J, Mahmudov KT, Guedes da Silva MF, Pombeiro AJ Tags: J Inorg Biochem Source Type: research

Specific binding modes of Cu(I) and Ag(I) with neurotoxic domain of the human prion protein.
Abstract Prion diseases are neurodegenerative disorders associated with a conformational change of the normal cellular isoform of the prion protein (PrP(C)) to an abnormal scrapie isoform (PrP(Sc)). human prion protein (hPrP(C)) is able to bind up to six Cu(II) ions. Four of them are distributed in the octarepeat domain, containing four tandem-repetitions of the sequence PHGGGWGQ. Immediately outside the octarepeat domain, in so called PrP amyloidogenic region, two additional and independent Cu(II) binding sites, encompassing His96 and His111 residues, respectively, are present. Considering the potential involveme...
Source: Journal of Inorganic Biochemistry - November 11, 2015 Category: Biochemistry Authors: Valensin D, Padula EM, Hecel A, Luczkowski M, Kozlowski H Tags: J Inorg Biochem Source Type: research

Pd(2+)-mediated base pairing in oligonucleotides.
g T Abstract Two short glycol nucleic acid (GNA) oligonucleotides, having either a terminal or an intrachain nucleobase replaced by the pyridine-2,6-dicarboxamide chelate of Pd(2+), have been synthesized and their hybridization properties studied by melting temperature measurements. In the termini of a double-stranded oligonucleotide, the Pd(2+) chelates provided dramatic stabilization of the duplex relative to its metal-free counterpart, in all likelihood owing to formation of Pd(2+)-mediated base pairs between pyridine-2,6-dicarboxamide and the opposing nucleobase. In contrast, no stabilization was observed when...
Source: Journal of Inorganic Biochemistry - November 11, 2015 Category: Biochemistry Authors: Golubev O, Turc G, Lönnberg T Tags: J Inorg Biochem Source Type: research