Applied and Environmental Microbiology This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

Opposing genetic polymorphisms of two ABC transporters contribute to the variation of nukacin resistance in Streptococcus mutans 
In conclusion, we identified a novel nukacin resistance factor, MukFEG, and either LctFEG or MukFEG was active in most strains via genetic polymorphisms depending on mukA-T genes.IMPORTANCEStreptococcus mutans is an important pathogenic bacterium not only for dental caries but also for systemic diseases. S. mutans is known to produce a variety of bacteriocins and to retain resistance these bacteriocins. In this study, two ABC transporters, LctFEG and MukFEG, were implicated in nukacin resistance and each ABC transporter has two subtypes, active and inactive. Of the two ABC transporters, only one ABC transporter was always ...
Source: Applied and Environmental Microbiology - February 27, 2024 Category: Microbiology Authors: Naoki Sadaoka Mi Nguyen-Tra Le Miki Kawada-Matsuo Sopongselamuny Eng Takeshi Zendo Jun Nakanishi Katsuhiro Takeda Hideki Shiba Hitoshi Komatsuzawa Source Type: research

Identification of bacterial dissimilatory antimonate reductase AnrA: genes and proteins involved in antimonate respiration and resistance in Geobacter sp. strain SVR
In this study, we demonstrated that the Sb(V) reductase (Anr) of an Sb(V)-respiring bacterium (Geobacter sp. SVR) is a novel member of the dimethyl sulfoxide (DMSO) reductase family. In addition, we found that strain SVR copes with Sb stress by modulating pleiotropic processes, including the Ant and Ars systems, and upregulating the antioxidant and quality control protein levels. Considering the abundance and diversity of putative anr genes in the environment, Anr may play a significant role in global Sb cycling in both marine and terrestrial environments.PMID:38411083 | DOI:10.1128/aem.01729-23 (Source: Applied and Enviro...
Source: Applied and Environmental Microbiology - February 27, 2024 Category: Microbiology Authors: Ryoya Kambara Shigeki Yamamura Seigo Amachi Source Type: research

Prebiotic effect of galacto- N -biose on the intestinal lactic acid bacteria as enhancer of acetate production and hypothetical colonization
In this study, we found that GNB could enhance the beneficial properties of intestinal lactic acid bacteria that inhabit the human GI tract, stimulating acetate production and promoting intestinal colonization. Our findings provide a rationale for the addition of GNB to lactic acid bacteria-based functional foods. This has also led to the development of therapeutics supported by more rational prebiotic and probiotic selection, leading to an improved healthy lifestyle for humans.PMID:38411084 | DOI:10.1128/aem.01445-23 (Source: Applied and Environmental Microbiology)
Source: Applied and Environmental Microbiology - February 27, 2024 Category: Microbiology Authors: Chiaki Matsuzaki Hiroki Takagi Sorachi Saiga Yuun Kinoshita Misako Yamaguchi Yasuki Higashimura Kenji Yamamoto Masanori Yamaguchi Source Type: research

Lineage-specific evolution of Aquibium , a close relative of Mesorhizobium , during habitat adaptation
Appl Environ Microbiol. 2024 Feb 27:e0209123. doi: 10.1128/aem.02091-23. Online ahead of print.ABSTRACTThe novel genus Aquibium that lacks nitrogenase was recently reclassified from the Mesorhizobium genus. The genomes of Aquibium species isolated from water were smaller and had higher GC contents than those of Mesorhizobium species. Six Mesorhizobium species lacking nitrogenase were found to exhibit low similarity in the average nucleotide identity values to the other 24 Mesorhizobium species. Therefore, they were classified as the non-N2-fixing Mesorhizobium lineage (N-ML), an evolutionary intermediate species. The resul...
Source: Applied and Environmental Microbiology - February 27, 2024 Category: Microbiology Authors: Minkyung Kim Wonjae Kim Yerim Park Jaejoon Jung Woojun Park Source Type: research

Retraction for Yadav et al., "The bidirectional extracellular electron transfer process aids iron cycling by Geoalkalibacter halelectricus in a highly saline-alkaline condition"
Appl Environ Microbiol. 2024 Feb 26:e0236523. doi: 10.1128/aem.02365-23. Online ahead of print.NO ABSTRACTPMID:38407065 | DOI:10.1128/aem.02365-23 (Source: Applied and Environmental Microbiology)
Source: Applied and Environmental Microbiology - February 26, 2024 Category: Microbiology Authors: Sukrampal Yadav Chetan Sadhotra Sunil A Patil Source Type: research

Retraction for Ni et al., "Autoregulation of Lantibiotic Bovicin HJ50 Biosynthesis by the BovK-BovR Two-Component Signal Transduction System in Streptococcus bovis HJ50"
Appl Environ Microbiol. 2024 Feb 26:e0000624. doi: 10.1128/aem.00006-24. Online ahead of print.NO ABSTRACTPMID:38407096 | DOI:10.1128/aem.00006-24 (Source: Applied and Environmental Microbiology)
Source: Applied and Environmental Microbiology - February 26, 2024 Category: Microbiology Authors: Jianqiang Ni Kunling Teng Gang Liu Caixia Qiao Liandong Huan Jin Zhong Source Type: research

Metal-oxide precipitation influences microbiome structure in hyporheic zones receiving acid rock drainage
Appl Environ Microbiol. 2024 Feb 23:e0198723. doi: 10.1128/aem.01987-23. Online ahead of print.ABSTRACTStreams impacted by historic mining activity are characterized by acidic pH, unique microbial communities, and abundant metal-oxide precipitation, all of which can influence groundwater-surface water exchange. We investigate how metal-oxide precipitates and hyporheic mixing mediate the composition of microbial communities in two streams receiving acid-rock and mine drainage near Silverton, Colorado, USA. A large, neutral pH hyporheic zone facilitated the precipitation of metal particles/colloids in hyporheic porewaters. A...
Source: Applied and Environmental Microbiology - February 23, 2024 Category: Microbiology Authors: Beth Hoagland Kalen L Rasmussen Kamini Singha John R Spear Alexis Navarre-Sitchler Source Type: research

UV-A radiation increases biomass yield by enhancing energy flow and carbon assimilation in the edible cyanobacterium Nostoc sphaeroides 
In this study, we investigated the effects of UV-A radiation on the growth, photosynthetic ability, and metabolome of the edible cyanobacterium Nostoc sphaeroides. Exposures to 5-15 W m-2 (15-46 µmol photons m-2 s-1) UV-A and 4.35 W m-2 (20 μmol photons m-2 s-1) visible light for 16 days significantly increased the growth rate and biomass production of N. sphaeroides cells by 18%-30% and 15%-56%, respectively, compared to the non-UV-A-acclimated cells. Additionally, the UV-A-acclimated cells exhibited a 1.8-fold increase in the cellular nicotinamide adenine dinucleotide phosphate (NADP) pool with an increase in photosynt...
Source: Applied and Environmental Microbiology - February 23, 2024 Category: Microbiology Authors: Zhen Chen Zu-Wen Yuan Wei-Xin Luo Xun Wu Jin-Long Pan Yong-Qi Yin Hai-Chen Shao Kui Xu Wei-Zhi Li Yuan-Liang Hu Zhe Wang Kun-Shan Gao Xiong-Wen Chen Source Type: research

Altitudinal patterns of alpine soil ammonia-oxidizing community structure and potential nitrification rate
Appl Environ Microbiol. 2024 Feb 22:e0007024. doi: 10.1128/aem.00070-24. Online ahead of print.ABSTRACTNitrogen availability limits the net primary productivity in alpine meadows on the Qinghai-Tibetan Plateau, which is regulated by ammonia-oxidizing microorganisms. However, little is known about the elevational patterns of soil ammonia oxidizers in alpine meadows. Here, we investigated the potential nitrification rate (PNR), abundance, and community diversity of soil ammonia-oxidizing microorganisms along the altitudinal gradient between 3,200 and 4,200 m in Qinghai-Tibetan alpine meadows. We found that both PNR and amoA ...
Source: Applied and Environmental Microbiology - February 22, 2024 Category: Microbiology Authors: Yuwei Zhao Ning Ling Xiang Liu Chao Li Xin Jing Jingjing Hu Junpeng Rui Source Type: research

The catabolism of lignin-derived p -methoxylated aromatic compounds by Rhodococcus jostii RHA1
This study expands our understanding of the bacterial catabolism of aromatic compounds and facilitates the development of biocatalysts for lignin valorization.IMPORTANCELignin, an abundant aromatic polymer found in plant biomass, is a promising renewable replacement for fossil fuels as a feedstock for the chemical industry. Strategies for upgrading lignin include processes that couple the catalytic fractionation of biomass and biocatalytic transformation of the resulting aromatic compounds with a microbial cell factory. Engineering microbial cell factories for this biocatalysis requires characterization of bacterial pathwa...
Source: Applied and Environmental Microbiology - February 21, 2024 Category: Microbiology Authors: Megan E Wolf Anne T Lalande Brianne L Newman Alissa C Bleem Chad T Palumbo Gregg T Beckham Lindsay D Eltis Source Type: research