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Virulence Regulation

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https://www.readbyqxmd.com/read/27933456/penicillin-v-acylases-from-gram-negative-bacteria-degrade-n-acylhomoserine-lactones-and-attenuate-virulence-in-pseudomonas-aeruginosa
#1
Avinash Vellore Sunder, Putri Dwi Utari, Sureshkumar Ramasamy, Ronald van Merkerk, Wim Quax, Archana Pundle
Virulence pathways in gram-negative pathogenic bacteria are regulated by quorum sensing mechanisms, through the production and sensing of N-acylhomoserine lactone (AHL) signal molecules. Enzymatic degradation of AHLs leading to attenuation of virulence (quorum quenching) could pave the way for the development of new antibacterials. Penicillin V acylases (PVAs) belong to the Ntn hydrolase superfamily, together with AHL acylases. PVAs are exploited widely in the pharmaceutical industry, but their role in the natural physiology of their native microbes is not clearly understood...
December 8, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27933042/the-role-of-stress-and-stress-adaptations-in-determining-the-fate-of-the-bacterial-pathogen-listeria-monocytogenes-in-the-food-chain
#2
REVIEW
Kerrie NicAogáin, Conor P O'Byrne
The foodborne pathogen Listeria monocytogenes is a highly adaptable organism that can persist in a wide range of environmental and food-related niches. The consumption of contaminated ready-to-eat foods can cause infections, termed listeriosis, in vulnerable humans, particularly those with weakened immune systems. Although these infections are comparatively rare they are associated with high mortality rates and therefore this pathogen has a significant impact on food safety. L. monocytogenes can adapt to and survive a wide range of stress conditions including low pH, low water activity, and low temperature, which makes it problematic for food producers who rely on these stresses for preservation...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27933036/functional-analysis-of-the-nitrogen-metabolite-repression-regulator-gene-nmra-in-aspergillus-flavus
#3
Xiaoyun Han, Mengguang Qiu, Bin Wang, Wen-Bing Yin, Xinyi Nie, Qiuping Qin, Silin Ren, Kunlong Yang, Feng Zhang, Zhenhong Zhuang, Shihua Wang
In Aspergillus nidulans, the nitrogen metabolite repression (NMR) regulator NmrA plays a major role in regulating the activity of the GATA transcription factor AreA during nitrogen metabolism. However, the function of nmrA in A. flavus has not been previously studied. Here, we report the identification and functional analysis of nmrA in A. flavus. Our work showed that the amino acid sequences of NmrA are highly conserved among Aspergillus species and that A. flavus NmrA protein contains a canonical Rossmann fold motif...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27932543/members-of-the-zinc-cluster-factor-family-alters-virulence-in-candida-albicans
#4
Luca Issi, Rhys A Farrer, Kelly Pastor, Benjamin Landry, Toni Delorey, George W Bell, Dawn A Thompson, Christina A Cuomo, Reeta P Rao
Virtually all humans are colonized with Candida albicans However, in immunocompromised individuals this benign commensal organism becomes a serious, life-threatening pathogen. Here, we describe and analyze the regulatory networks that modulate innate responses in the host niches. We identified Zcf15 and Zcf29, two Zinc Cluster transcription Factors (ZCF) that are required for C. albicans virulence. Previous sequence analysis of clinical C. albicans isolates from immunocompromised patients indicates that both ZCF genes diverged during clonal evolution...
December 7, 2016: Genetics
https://www.readbyqxmd.com/read/27929533/the-yersinia-type-iii-secretion-effector-yopm-is-an-e3-ubiquitin-ligase-that-induced-necrotic-cell-death-by-targeting-nlrp3
#5
Congwen Wei, Ying Wang, Zongmin Du, Kai Guan, Ye Cao, Huiying Yang, Pengyu Zhou, Feixiang Wu, Jiankang Chen, Penghao Wang, Zirui Zheng, Pingping Zhang, Yanhong Zhang, Shengli Ma, Ruifu Yang, Hui Zhong, Xiang He
Yersinia pestis uses type III effector proteins to target eukaryotic signaling systems. The Yersinia outer protein (Yop) M effector from the Y. pestis strain is a critical virulence determinant; however, its role in Y. pestis pathogenesis is just beginning to emerge. Here we first identify YopM as the structural mimic of the bacterial IpaH E3 ligase family in vitro, and establish that the conserved CLD motif in its N-terminal is responsible for the E3 ligase function. Furthermore, we show that NLRP3 is a novel target of the YopM protein...
December 8, 2016: Cell Death & Disease
https://www.readbyqxmd.com/read/27924027/crystal-structure-of-pseudomonas-aeruginosa-rsal-bound-to-promoter-dna-reaffirms-its-role-as-a-global-regulator-involved-in-quorum-sensing
#6
Huaping Kang, Jianhua Gan, Jingru Zhao, Weina Kong, Jing Zhang, Miao Zhu, Fan Li, Yaqin Song, Jin Qin, Haihua Liang
Pseudomonas aeruginosa possesses at least three well-defined quorum-sensing (QS) (las, rhl and pqs) systems that control a variety of important functions including virulence. RsaL is a QS repressor that reduces QS signal production and ensures homeostasis by functioning in opposition to LasR. However, its regulatory role in signal homeostasis remains elusive. Here, we conducted a ChIP-seq assay and revealed that RsaL bound to two new targets, the intergenic regions of PA2228/PA2229 and pqsH/cdpR, which are required for PQS synthesis...
October 18, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27923956/adaptation-to-potassium-limitation-is-essential-for-acinetobacter-baumannii-pneumonia-pathogenesis
#7
Reham Samir, Salma H Hussein, Noha M Elhosseiny, Marwa S Khattab, Alaa E Shawky, Ahmed S Attia
BACKGROUND:  Acinetobacter baumannii is challenging the healthcare community as the cause of a wide range of untreatable infections. New targets need to be explored for the development of therapeutics. METHODS:  The potassium-dependent protein (Kdp) system was investigated via bioinformatics and genetic tools. An isogenic mutant was constructed in kdpE and complemented in trans Gene expression and the ability to grow under potassium-limited conditions were investigated...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27921081/a-fungus-specific-protein-domain-is-essential-for-rasa-mediated-morphogenetic-signaling-in-aspergillus-fumigatus
#8
Qusai Al Abdallah, Tiffany S Norton, Amy M Hill, Lawrence L LeClaire, Jarrod R Fortwendel
Ras proteins function as conserved regulators of eukaryotic growth and differentiation and are essential signaling proteins orchestrating virulence in pathogenic fungi. Here, we report the identification of a novel N-terminal domain of the RasA protein in the filamentous fungus Aspergillus fumigatus. Whereas this domain is absent in Ras homologs of higher eukaryotes, the N-terminal extension is conserved among fungi and is characterized by a short string of two to eight amino acids terminating in an invariant arginine...
November 2016: MSphere
https://www.readbyqxmd.com/read/27920769/transcriptional-profiling-of-type-ii-toxin-antitoxin-genes-of-helicobacter-pylori-under-different-environmental-conditions-identification-of-hp0967-hp0968-system
#9
María G Cárdenas-Mondragón, Miguel A Ares, Leonardo G Panunzi, Sabino Pacheco, Margarita Camorlinga-Ponce, Jorge A Girón, Javier Torres, Miguel A De la Cruz
Helicobacter pylori is a Gram-negative bacterium that colonizes the human gastric mucosa and is responsible for causing peptic ulcers and gastric carcinoma. The expression of virulence factors allows the persistence of H. pylori in the stomach, which results in a chronic, sometimes uncontrolled inflammatory response. Type II toxin-antitoxin (TA) systems have emerged as important virulence factors in many pathogenic bacteria. Three type II TA systems have previously been identified in the genome of H. pylori 26695: HP0315-HP0316, HP0892-HP0893, and HP0894-HP0895...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27920756/salmonella-typhimurium-and-multidirectional-communication-in-the-gut
#10
REVIEW
Elena V Gart, Jan S Suchodolski, Thomas H Welsh, Robert C Alaniz, Ronald D Randel, Sara D Lawhon
The mammalian digestive tract is home to trillions of microbes, including bacteria, archaea, protozoa, fungi, and viruses. In monogastric mammals the stomach and small intestine harbor diverse bacterial populations but are typically less populated than the colon. The gut bacterial community (microbiota hereafter) varies widely among different host species and individuals within a species. It is influenced by season of the year, age of the host, stress and disease. Ideally, the host and microbiota benefit each other...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27920294/effects-of-increasing-the-affinity-of-card-for-rna-polymerase-on-mycobacterium-tuberculosis-growth-rrna-transcription-and-virulence
#11
Ashley L Garner, Jayan Rammohan, Jeremy P Huynh, Lucas M Onder, James Chen, Brian Bae, Drake Jensen, Leslie A Weiss, Ana Ruiz Manzano, Seth A Darst, Elizabeth A Campbell, Bryce E Nickels, Eric A Galburt, Christina L Stallings
: CarD is an essential RNA polymerase (RNAP) interacting protein in Mycobacterium tuberculosis (Mtb) that stimulates formation of RNAP-promoter open complexes. CarD plays a complex role in Mtb growth and virulence that is not fully understood. Therefore, to gain further insight into the role of CarD in Mtb growth and virulence we determined the effect of increasing the affinity of CarD for RNAP. Using site-directed mutagenesis guided by crystal structures of CarD bound to RNAP, we identified amino acid substitutions that increase the affinity of CarD for RNAP...
December 5, 2016: Journal of Bacteriology
https://www.readbyqxmd.com/read/27919444/mechanistic-genomic-and-proteomic-study-on-the-effects-of-bisgma-derived-biodegradation-product-on-cariogenic-bacteria
#12
Lida Sadeghinejad, Dennis G Cvitkovitch, Walter L Siqueira, Justin Merritt, J Paul Santerre, Yoav Finer
OBJECTIVES: Investigate the effects of a Bis-phenyl-glycidyl-dimethacrylate (BisGMA) biodegradation product, bishydroxypropoxyphenyl-propane (BisHPPP), on gene expression and protein synthesis of cariogenic bacteria. METHODS: Quantitative real-time polymerase chain reaction was used to investigate the effects of BisHPPP on the expression of specific virulence-associated genes, i.e. gtfB, gtfC, gbpB, comC, comD, comE and atpH in Streptococcus mutans UA159. Possible mechanisms for bacterial response to BisHPPP were explored using gene knock-out and associated complemented strains of the signal peptide encoding gene, comC...
December 2, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27918582/investigating-conservation-of-the-cell-cycle-regulated-transcriptional-program-in-the-fungal-pathogen-cryptococcus-neoformans
#13
Christina M Kelliher, Adam R Leman, Crystal S Sierra, Steven B Haase
The pathogenic yeast Cryptococcus neoformans causes fungal meningitis in immune-compromised patients. Cell proliferation in the budding yeast form is required for C. neoformans to infect human hosts, and virulence factors such as capsule formation and melanin production are affected by cell-cycle perturbation. Thus, understanding cell-cycle regulation is critical for a full understanding of virulence factors for disease. Our group and others have demonstrated that a large fraction of genes in Saccharomyces cerevisiae is expressed periodically during the cell cycle, and that proper regulation of this transcriptional program is important for proper cell division...
December 2016: PLoS Genetics
https://www.readbyqxmd.com/read/27917181/nitric-oxide-responsive-heavy-metal-associated-gene-athmad1-contributes-to-development-and-disease-resistance-in-arabidopsis-thaliana
#14
Q Muhammad Imran, Noreen Falak, Adil Hussain, Bong-Gyu Mun, Arti Sharma, Sang-Uk Lee, Kyung-Min Kim, Byung-Wook Yun
Exposure of plants to different biotic and abiotic stress condition instigates significant change in the cellular redox status; resulting in the elevation of reactive nitrogen species that play signaling role in mediating defense responses. Heavy metal associated (HMA) domain containing genes are required for spatio-temporal transportation of metal ions that bind with various enzymes and co-factors within the cell. To uncover the underlying mechanisms mediated by AtHMA genes, we identified 14 Arabidopsis HMA genes that were differentially expressed in response to nitrosative stress through RNA-seq analysis...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27916940/h-ns-its-family-members-and-their-regulation-of-virulence-genes-in-shigella-species
#15
REVIEW
Michael A Picker, Helen J Wing
The histone-like nucleoid structuring protein (H-NS) has played a key role in shaping the evolution of Shigella spp., and provides the backdrop to the regulatory cascade that controls virulence by silencing many genes found on the large virulence plasmid. H-NS and its paralogue StpA are present in all four Shigella spp., but a second H-NS paralogue, Sfh, is found in the Shigella flexneri type strain 2457T, which is routinely used in studies of Shigella pathogenesis. While StpA and Sfh have been proposed to serve as "molecular backups" for H-NS, the apparent redundancy of these proteins is questioned by in vitro studies and work done in Escherichia coli...
December 1, 2016: Genes
https://www.readbyqxmd.com/read/27916855/comparative-proteome-analysis-of-porcine-jejunum-tissues-in-response-to-a-virulent-strain-of-porcine-epidemic-diarrhea-virus-and-its-attenuated-strain
#16
Zhonghua Li, Fangzhou Chen, Shiyi Ye, Xiaozhen Guo, Atta Muhanmmad Memon, Meizhou Wu, Qigai He
Porcine epidemic diarrhea virus (PEDV), a predominant cause of acute enteric infection, leads to severe dehydrating diarrhea and mortality in piglets all over the world. A virulent PEDV YN13 strain, isolated in our laboratory, was attenuated to yield an attenuated PEDV strain YN144. To better understand the pathogenesis mechanism and the virus-host interaction during infection with both PEDV YN13 and YN144 strains, a comparative proteomic analysis was carried out to investigate the proteomic changes produced in the primary target organ, using isobaric tags for relative and absolute quantitation (iTRAQ) labeling, followed by liquid chromatography tandem-mass spectrometry (LC-MS/MS)...
November 29, 2016: Viruses
https://www.readbyqxmd.com/read/27915337/quercetin-assists-fluconazole-to-inhibit-biofilm-formations-of-fluconazole-resistant-candida-albicans-in-in-vitro-and-in-vivo-antifungal-managements-of-vulvovaginal-candidiasis
#17
Mei Gao, Hui Wang, LiJuan Zhu
BACKGROUND: Vulvovaginal candidiasis (VVC) is a common gynecological disease. Candida albicans is believed to be mainly implicated in VVC occurrence, the biofilm of which is one of the virulence factors responsible for resistance to traditional antifungal agents especially to fluconazole (FCZ). Quercetin (QCT) is a dietary flavonoid and has been demonstrated to be antifungal against C. albicans biofilm. METHODS: 17 C. albicans isolates including 15 clinical ones isolated from VVC patients were employed to investigate the effects of QCT and/or FCZ on the inhibition of C...
November 30, 2016: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/27915294/insightful-directed-evolution-of-escherichia-coli-quorum-sensing-promoter-region-of-the-lsracdbfg-operon-a-tool-for-synthetic-biology-systems-and-protein-expression
#18
Pricila Hauk, Kristina Stephens, Ryan Mckay, Chelsea Ryan Virgile, Hana Ueda, Marc Ostermeier, Kyoung-Seok Ryu, Herman O Sintim, William E Bentley
Quorum sensing (QS) regulates many natural phenotypes (e.q. virulence, biofilm formation, antibiotic resistance), and its components, when incorporated into synthetic genetic circuits, enable user-directed phenotypes. We created a library of Escherichia coli lsr operon promoters using error-prone PCR (ePCR) and selected for promoters that provided E. coli with higher tetracycline resistance over the native promoter when placed upstream of the tet(C) gene. Among the fourteen clones identified, we found several mutations in the binding sites of QS repressor, LsrR...
December 1, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27915248/comparative-proteomic-analysis-unravels-a-role-for-esrb-in-the-regulation-of-reactive-oxygen-species-stress-responses-in-edwardsiella-piscicida
#19
Kaiyu Yin, Qiyao Wang, Jingfan Xiao, Yuanxing Zhang
As a leading pathogen, Edwardsiella piscicida can cause hemorrhagic septicemia in fish and gastro-intestinal infections in humans. The two-component regulatory system EsrA-EsrB plays essential roles in pathogenesis through the type III and type VI secretion systems, and hemolysin production in E. piscicida It is unclear whether other virulence- or stress response-associated genes are regulated by EsrA-EsrB. In this study, the proteomes of wild type E. piscicida EIB202 and esrB mutant strains were compared to reveal EsrB regulon components after growth in LB...
December 2, 2016: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/27915049/csn1201-a-subunit-of-the-cop9-signalosome-regulates-the-virulence-in-cryptococcus-neoformans-infection
#20
Yibin Fan, Xiaohua Tao, Weili Pan, Wei Fang, Youming Huang, Mingyan Jia
The COP9 signalosome (CSN) is a multisubunit protein complex, and it now has been found to participate in diverse cellular and developmental processes in various eukaryotic organisms. Cryptococcus neoformans (C. neoformans) is an important basidiomycete pathogen that causes life-threatening meningoencephalitis primarily in the immune compromised population. Here, we generated CSN deletion mutants to investigate the role in Cryptococcus infection. Compared to other CSN mutants, we identified a CSN1201 mutant exhibited severely attenuated virulence...
November 30, 2016: Fungal Genetics and Biology: FG & B
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