Fems Microbiology Letters最新文献_第9页

Essential oils from Cuminum cyminum and Laurus nobilis and their principal constituents: evaluation of antifungal and antimycotoxigenic potential in Aspergillus species. 孜然和月桂的精油及其主要成分：对曲霉菌抗真菌和抗霉菌毒素潜力的评估。

IF 2.2 4区生物学

Fems Microbiology Letters Pub Date : 2024-01-09 DOI: 10.1093/femsle/fnae081

Gabriela Aguiar Campolina, Maria das Graças Cardoso, Carolina Salles Freire, Alex Rodrigues Silva Caetano, Anna Beatriz de Souza Campos, Vanuzia Rodrigues Fernandes Ferreira, Eduardo Alves, David Lee Nelson, Luis Roberto Batista

{"title":"Essential oils from Cuminum cyminum and Laurus nobilis and their principal constituents: evaluation of antifungal and antimycotoxigenic potential in Aspergillus species.","authors":"Gabriela Aguiar Campolina, Maria das Graças Cardoso, Carolina Salles Freire, Alex Rodrigues Silva Caetano, Anna Beatriz de Souza Campos, Vanuzia Rodrigues Fernandes Ferreira, Eduardo Alves, David Lee Nelson, Luis Roberto Batista","doi":"10.1093/femsle/fnae081","DOIUrl":"10.1093/femsle/fnae081","url":null,"abstract":"The antifungal and antimycotoxigenic activities of the essential oils (EO) from Cuminum cyminum and Laurus nobilis, and their respective principal compounds, cuminaldehyde and 1,8-cineole, were evaluated against fungi of the genus Aspergillus: A. carbonarius, A. niger, A. ochraceus, and A. westerdijkiae. The antifungal activity was determined by the contact method and the mycelial growth of the fungi was evaluated. Scanning electron microscopic (SEM) images were obtained to suggest modes of action of the compounds analysed. The antimycotoxigenic activity was determined by high-performance liquid chromatograph. Aspergillus carbonarius was completely inhibited by cumin EO (500 µl l-1), by laurel EO and by cuminaldehyde (5000 µl l-1). The cumin EO (500 µl l-1) completely inhibited the growth of A. niger. All the samples inhibited the mycelial growth of A. ochraceus, especially cumin EO and cuminaldehyde (250 µl l-1). Aspergillus westerdijkiae was completely inhibited by cumin EO and cuminaldehyde (1000 µl l-1), by laurel EO and 1,8-cineole (10 000 µl l-1). A decrease in the production of ochratoxin A (OTA) was observed post-treatment, except in A. ochraceus, only inhibited by laurel EO. SEM images showed morphological changes in fungal structures and spore inhibition post-treatment. The results confirmed the antifungal and antimycotoxigenic effect of EO and their principal constituents on fungi evaluated.","PeriodicalId":12214,"journal":{"name":"Fems Microbiology Letters","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142371406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bacteria involved in the sulfur cycle in tarballs collected from the Alabama Gulf Coast. 从阿拉巴马州海湾沿岸收集的焦油球中参与硫循环的细菌。

IF 2.1 4区生物学

Fems Microbiology Letters Pub Date : 2024-01-09 DOI: 10.1093/femsle/fnae003

Joo-Han Gwak, Sung-Keun Rhee, Joong-Wook Park

引用次数: 0

Metabolic reprogramming in the food-borne pathogen Listeria monocytogenes as a critical defence against acid stress. 食源性病原体单核细胞增生李斯特菌的代谢重编程是抵御酸胁迫的关键。

IF 2.2 4区生物学

Fems Microbiology Letters Pub Date : 2024-01-09 DOI: 10.1093/femsle/fnae060

Jialun Wu, Chuhan Wang, Conor O'Byrne

{"title":"Metabolic reprogramming in the food-borne pathogen Listeria monocytogenes as a critical defence against acid stress.","authors":"Jialun Wu, Chuhan Wang, Conor O'Byrne","doi":"10.1093/femsle/fnae060","DOIUrl":"10.1093/femsle/fnae060","url":null,"abstract":"The ability to sense and respond effectively to acidic stress is important for microorganisms to survive and proliferate in fluctuating environments. As specific metabolic activities can serve to buffer the cytoplasmic pH, microorganisms rewire their metabolism to favour these reactions and thereby mitigate acid stress. The orally acquired pathogen Listeria monocytogenes exploits alternative metabolic activities to overcome the acidic stress encountered in the human stomach or food products. In this minireview, we discuss the metabolic processes in L. monocytogenes that mitigate acid stress, with an emphasis on the proton-depleting reactions, including glutamate decarboxylation, arginine/agmatine deimination, and fermentative acetoin production. We also summarize the recent findings on regulatory mechanisms that control the expression of genes that are responsible for these metabolic activities, including the general stress response regulator SigB, arginine repressor ArgR, and the recently discovered RofA-like transcriptional regulatory GadR. We further discuss the importance of this metabolic reprogramming in the context of food products and within the host. Finally, we highlight some outstanding challenges in the field, including an understanding of acid-sensing mechanisms, the role of intraspecies heterogeneity in acid resistance, and how a fundamental understanding of acid stress response can be exploited for food formulation to improve food safety and reduce food waste.","PeriodicalId":12214,"journal":{"name":"Fems Microbiology Letters","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11334721/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141906372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The influence of cigR gene on the pathogenicity of Salmonella paratyphi A in vitro and in vivo. cigR 基因对副伤寒甲型沙门氏菌体外和体内致病性的影响。

IF 2.2 4区生物学

Fems Microbiology Letters Pub Date : 2024-01-09 DOI: 10.1093/femsle/fnae067

Junlei Yin, Lijun Wang, Ronghua Shen, Jinjiao He, Shaozu Li, Huajian Wang, Zhao Cheng

{"title":"The influence of cigR gene on the pathogenicity of Salmonella paratyphi A in vitro and in vivo.","authors":"Junlei Yin, Lijun Wang, Ronghua Shen, Jinjiao He, Shaozu Li, Huajian Wang, Zhao Cheng","doi":"10.1093/femsle/fnae067","DOIUrl":"10.1093/femsle/fnae067","url":null,"abstract":"Salmonella Paratyphi A is the causative agent of paratyphoid fever A which is a serious threat to human health in many countries. The cigR gene located in Salmonella pathogenicity island 3 is a type III secretion system 2 effector gene. However, the influence of cigR gene on the pathogenicity of Salmonella Paratyphi A remains unclear. Here, a cigR gene deletion mutant of Salmonella Paratyphi A was constructed and its pathogenic changes were also evaluated. It was found that both the growth and biochemical features have not changed after the loss of cigR, but the absence of cigR significantly enhanced the replication and/or survival ability in phorbol-12-myristate-13-acetate (PMA)-differentiated human macrophage THP-1 cells and in mouse; the proliferative activity and apoptosis of PMA-differentiated THP-1 cell were significantly decreased and increased, respectively, after the lack of cigR gene; and the mutant showed increased virulence to a mouse infection model by decreased half-lethal dose (LD50) value and enhanced the proliferation ratio of bacteria in vivo. These results demonstrated that CigR is an anti-virulence factor and plays an important role in the pathogenicity of Salmonella Paratyphi A.","PeriodicalId":12214,"journal":{"name":"Fems Microbiology Letters","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142008540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In memoriam: Prof Yuri Alexandrovich Trotsenko (1941-2021). 悼念尤里-亚历山德罗维奇-特罗岑科教授（1941-2021）。

IF 2.1 4区生物学

Fems Microbiology Letters Pub Date : 2024-01-09 DOI: 10.1093/femsle/fnae024

Rich Boden

引用次数: 0

Metagenomics reveals the divergence of gut microbiome composition and function in two common pika species (Ochotona curzoniae and Ochotona daurica) in China. 元基因组学揭示了中国两种常见鼠兔（Ochotona curzoniae和Ochotona daurica）肠道微生物组组成和功能的差异。

IF 2.2 4区生物学

Fems Microbiology Letters Pub Date : 2024-01-09 DOI: 10.1093/femsle/fnae092

Xueqian Hu, Jie Bi, Qiaoling Yu, Huan Li

{"title":"Metagenomics reveals the divergence of gut microbiome composition and function in two common pika species (Ochotona curzoniae and Ochotona daurica) in China.","authors":"Xueqian Hu, Jie Bi, Qiaoling Yu, Huan Li","doi":"10.1093/femsle/fnae092","DOIUrl":"10.1093/femsle/fnae092","url":null,"abstract":"Gut microbiome plays crucial roles in animal adaptation and evolution. However, research on adaptation and evolution of small wild high-altitude mammals from the perspective of gut microbiome is still limited. In this study, we compared differences in intestinal microbiota composition and function in Plateau pikas (Ochotona curzoniae) and Daurian pikas (O. daurica) using metagenomic sequencing. Our results showed that microbial community structure had distinct differences in different pika species. Prevotella, Methanosarcina, Rhizophagus, and Podoviridae were abundant bacteria, archaea, eukaryotes, and viruses in Plateau pikas, respectively. However, Prevotella, Methanosarcina, Ustilago, and Retroviridae were dominated in Daurian pikas. Functional pathways related to carbohydrate metabolism that refer to the utilization of pectin, hemicellulose, and debranching enzymes were abundant in Plateau pikas, while the function for degradation of chitin, lignin, and cellulose was more concentrated in Daurian pikas. Pika gut had abundant multidrug resistance genes, followed by glycopeptide and beta-lactamase resistance genes, as well as high-risk antibiotic resistance genes, such as mepA, tetM, and bacA. Escherichia coli and Klebsiella pneumoniae may be potential hosts of mepA. This research provided new insights for adaptation and evolution of wild animals from perspective of gut microbiome and broadened our understanding of high-risk antibiotic resistance genes and potential pathogens of wild animals.","PeriodicalId":12214,"journal":{"name":"Fems Microbiology Letters","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142581375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

PqqF inhibits T6SS secretion by decreasing the pH in Serratia marcescens FS14. PqqF 通过降低 Serratia marcescens FS14 的 pH 值来抑制 T6SS 的分泌。

IF 2.2 4区生物学

Fems Microbiology Letters Pub Date : 2024-01-09 DOI: 10.1093/femsle/fnae047

Fengyu Jia, Xuede Peng, Xiaomei Yang, Shenshen Qiu, Shanshan Jia, Tingting Ran, Weiwu Wang, Dongqing Xu

引用次数: 0

Menaquinone production in genetically engineered E. coli. 在基因工程大肠杆菌中生产甲萘醌。

IF 2.2 4区生物学

Fems Microbiology Letters Pub Date : 2024-01-09 DOI: 10.1093/femsle/fnae098

Jomkwan Jumpathong, Ikuhisa Nishida, Tomohiro Kaino, Makoto Kawamukai

{"title":"Menaquinone production in genetically engineered E. coli.","authors":"Jomkwan Jumpathong, Ikuhisa Nishida, Tomohiro Kaino, Makoto Kawamukai","doi":"10.1093/femsle/fnae098","DOIUrl":"10.1093/femsle/fnae098","url":null,"abstract":"Menaquinone (MK) is an important electron transporter in Escherichia coli. This isoprenoid quinone can transfer electrons to many terminal acceptors, such as fumarate and nitrate, which helps this organism survive under diverse and challenging conditions. As isoprenoid quinones with various lengths of isoprenyl tail are widely distributed in nature, the heterologous expression of polyprenyl diphosphate synthases (PDSs) has been investigated using its counterpart, ubiquinone (UQ). In this study, we investigated the MK production by the expression of various heterologous PDS genes from prokaryotic and eukaryotic species, including Saccharomyces cerevisiae COQ1 (hexa-PDS), Haemophilus influenzae hi0881 (hepta-PDS), Synechocystis sp. strain PCC6803 slr0611 (nona-PDS), and Gluconobacter suboxydans ddsA (deca-PDS) in E. coli. We detected specific isoforms of MK, including MK7, MK9, and MK10, via the expression of HI0881, Slr0611, and DdsA respectively, but barely detected MK6 via the expression of Coq1. As UQ6 was detected in E. coli harboring COQ1, the acceptance of the side chain lengths by MenA (prenyl transferase for MK) was narrower than UbiA (prenyl transferase for UQ). We also identified a mutation in menA in the E. coli AN386 strain and a transposon insertion of IS186 in menC in E. coli KO229 (∆ispB) and its parental strain FS1576. Taken together, these results elucidate the different nature of MenA from UbiA.","PeriodicalId":12214,"journal":{"name":"Fems Microbiology Letters","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142617287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An extensive ion-pair/hydrogen-bond network contributes to the thermostability of the MutL ATPase domain from Aquifex aeolicus. 广泛的离子对/氢键网络有助于提高 Aquifex aeolicus 的 MutL ATPase 结构域的耐热性。

IF 2.1 4区生物学

Fems Microbiology Letters Pub Date : 2024-01-09 DOI: 10.1093/femsle/fnae020

Ayaka Shibuya, Maki Yokote, Atsushi Suzuki, Kenji Fukui, Takato Yano

引用次数: 0

Increasing community prevalence of extended-spectrum beta-lactamase-producing Escherichia coli in urine is associated with increasing district-level antibiotic consumption. 尿液中产广谱β-内酰胺酶大肠埃希菌社区流行率的增加与地区级抗生素消耗量的增加有关。

IF 2.2 4区生物学

Fems Microbiology Letters Pub Date : 2024-01-09 DOI: 10.1093/femsle/fnae038

Larissa Hermann de Souza Nunes, Victoria Stadler Tasca Ribeiro, Rafael Buttini Salviato, Ana Paula de Andrade, Paula Hansen Suss, Fernando José Vicenzi, Adriano Akira Ferreira Hino, João Paulo Telles, Felipe Francisco Tuon

{"title":"Increasing community prevalence of extended-spectrum beta-lactamase-producing Escherichia coli in urine is associated with increasing district-level antibiotic consumption.","authors":"Larissa Hermann de Souza Nunes, Victoria Stadler Tasca Ribeiro, Rafael Buttini Salviato, Ana Paula de Andrade, Paula Hansen Suss, Fernando José Vicenzi, Adriano Akira Ferreira Hino, João Paulo Telles, Felipe Francisco Tuon","doi":"10.1093/femsle/fnae038","DOIUrl":"10.1093/femsle/fnae038","url":null,"abstract":"This study aimed to analyze ESBL-producing Escherichia coli prevalence in urine samples collected between 2011-2019 in Curitiba, a large city in Brazil, and relating it to antibiotic consumption and sanitary conditions. This is a longitudinal study correlating prevalence of ESBL-producing E. coli isolates from urine samples with district-level antibiotic consumption and sociodemographic data during 2011-2019. E. coli isolates were tested for antibiotic susceptibility and ESBL by an automated method. Statistical analysis applied linear regressions, pooled ordinary least squares, and fixed effects models for districts or years. The Chow and Hausman tests indicated that the fixed effects model for individual districts fitted best. Chi-square test was used for qualitative variables (statistical significance was set when P < 0.05). Among the 886 535 urine sample cultures, 9.9% of isolates were ESBL-producing E. coli. Their prevalence increased from 4.7% in 2012 to 19.3% in 2019 (P < 0.0001; R2 = 0.922). This progressive increase correlated with age (P = 0.007; R2 = 0.8725) and male gender (P < 0.001) and increased antibiotic consumption (P = 0.0386; R2 = 0.47). The fixed effects model showed that district influences ESBL prevalence and that antibiotic consumption explains 20%-30% of this variation, with an increase of one defined daily dose accounting for an increase of 0.02084 percentage points of ESBL. The increasing prevalence of ESBL-producing E. coli can, to a considerable extent, be explained by increasing antibiotic consumption.","PeriodicalId":12214,"journal":{"name":"Fems Microbiology Letters","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141183937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0