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https://www.readbyqxmd.com/read/28647124/putative-protein-vc0395_0300-from-vibrio-cholerae-is-a-diguanylate-cyclase-with-a-role-in-biofilm-formation
#1
Divya Bandekar, Om Prakash Chouhan, Swati Mohapatra, Mousumi Hazra, Saugata Hazra, Sumit Biswas
The hallmark of the lifecycle of Vibrio cholerae is its ability to switch between two lifestyles - the sessile, non-pathogenic form and the motile, infectious form in human hosts. One of these changes is in the formation of surface biofilms, when in sessile aquatic habitats. The cell-cell interactions within a V. cholerae biofilm are stabilized by the production of an exopolysachharide (EPS) matrix, which in turn is regulated by the ubiquitous secondary messenger, cyclic di-GMP (c-di-GMP), synthesized by proteins containing GGD(/E)EF domains in all prokaryotic systems...
September 2017: Microbiological Research
https://www.readbyqxmd.com/read/28645224/a-symphony-of-cyclases-specificity-in-diguanylate-cyclase-signaling
#2
Kurt M Dahlstrom, George A O'Toole
Cyclic diguanylate (c-di-GMP) is a near universal signaling molecule produced by diguanylate cyclases that can direct a variety of bacterial behaviors. A major area of research over the last several years has been aimed at understanding how a cell with dozens of diguanylate cyclases can deploy a given subset of them to produce a desired phenotypic outcome without undesired cross talk between c-di-GMP-dependent systems. Several models have been put forward to address this question, including specificity of cyclase activation, tuned binding constants of effector proteins, and physical interaction between cyclases and effectors...
June 23, 2017: Annual Review of Microbiology
https://www.readbyqxmd.com/read/28642753/suhb-regulates-the-motile-sessile-switch-in-pseudomonas-aeruginosa-through-the-gac-rsm-pathway-and-c-di-gmp-signaling
#3
Kewei Li, Guangjian Yang, Alexander B Debru, Pingping Li, Li Zong, Peizhen Li, Teng Xu, Weihui Wu, Shouguang Jin, Qiyu Bao
Many Pseudomonas aeruginosa virulence traits that contribute to human infections are accepted as being associated with its environmental lifestyle. Therefore, identifying the molecular mechanisms that govern the lifestyle choice is of high significance. We previously reported that a mutation in suhB results in a decrease in swimming motility and increased biofilm formation compared to the wild-type strain. Yet, little is known about how this occurs. In this study, we demonstrated that SuhB inversely regulates motility and biofilm formation through the GacA-RsmY/Z-RsmA cascade...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28638070/thioesterase-ybgc-affects-motility-by-modulating-c-di-gmp-levels-in-shewanella-oneidensis
#4
Tong Gao, Qiu Meng, Haichun Gao
Because of ubiquity of thioesters, thioesterases play a critical role in metabolism, membrane biosynthesis, signal transduction, and gene regulation. In many bacteria, YbgC is such an enzyme, whose coding gene mostly resides in the tol-pal cluster. Although all other proteins encoded in the tol-pal cluster are clearly involved in maintaining cell envelope integrity and cell division, little is known about the physiological role of YbgC. In this study, we identify in Shewanella oneidensis, a γ-proteobacterium used as a research model for environmental microbes, YbgC as a motility regulator...
June 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28636257/covalent-attachment-and-pro-pro-endopeptidase-ppep-1-mediated-release-of-clostridium-difficile-cell-surface-proteins-involved-in-adhesion
#5
REVIEW
Jeroen Corver, Valentina Cordo', Hans C van Leeuwen, Oleg I Klychnikov, Paul J Hensbergen
In the past decade, Clostridium difficile has emerged as an important gut pathogen. This anaerobic, Gram-positive bacterium is the main cause of infectious nosocomial diarrhea. Whereas much is known about the mechanism through which the C. difficile toxins cause diarrhea, relatively little is known about the dynamics of adhesion and motility, which is mediated by cell surface proteins. This review will discuss the recent advances in our understanding of the sortase-mediated covalent attachment of cell surface (adhesion) proteins to the peptidoglycan layer of C...
June 21, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28635593/the-protein-slr1143-is-an-active-diguanylate-cyclase-in-synechocystis-sp-pcc-6803-and-interacts-with-the-photoreceptor-cph2
#6
Veronika Angerer, Philipp Schwenk, Thomas Wallner, Volkhard Kaever, Andreas Hiltbrunner, Annegret Wilde
Cyclic-di-GMP is an ubiquitous second messenger in bacteria. Several c-di-GMP receptor proteins have been identified to date, and downstream signalling pathways are often mediated through protein-protein interactions. The photoreceptor Cph2 from the cyanobacterium Synechocystis sp. PCC 6803 comprises three domains related to c-di-GMP metabolism: two GGDEF and one EAL domain. It has been shown that the C-terminal GGDEF domain acts as blue-light triggered c-di-GMP producer thereby inhibiting motility of the cells in blue light...
June 21, 2017: Microbiology
https://www.readbyqxmd.com/read/28620360/cytr-homolog-of-pectobacterium-carotovorum-subsp-carotovorum-controls-air-liquid-biofilm-formation-by-regulating-multiple-genes-involved-in-cellulose-production-c-di-gmp-signaling-motility-and-type-iii-secretion-system-in-response-to-nutritional-and-environmental
#7
M M Haque, M M H Oliver, Kamrun Nahar, Mohammad Z Alam, Hisae Hirata, Shinji Tsuyumu
Pectobacterium carotovorum subsp. carotovorum [Pcc (formerly Erwinia carotovora subsp. carotovora)] PC1 causes soft-rot disease in a wide variety of plant species by secreting multiple pathogenicity-related traits. In this study, regulatory mechanism of air-liquid (AL) biofilm formation was studied using a cytR homolog gene deletion mutant (ΔcytR) of Pcc PC1. Compared to the wild type (Pcc PC1), the ΔcytR mutant produced fragile and significantly (P < 0.001) lower amounts of AL biofilm on salt-optimized broth plus 2% glycerol (SOBG), yeast peptone dextrose adenine, and also on King's B at 27°C after 72 h incubation in static condition...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28619510/crystal-structure-of-brlr-with-c-di-gmp
#8
Harikiran Raju, Rohan Sharma
The transcriptional regulator BrlR is a member of the MerR family of multidrug transport activators in Pseudomonas aeruginosa. Recent study indicates that BrlR is a novel 3',5'-cyclic diguanylic acid (c-di-GMP) receptor and can be activated by c-di- GMP. To gain insight into BrlR function, we determined the structure of BrlR with c-di-GMP complex structure to 2.5 Å. The structure and SEC data revealed BrlR forms a tetramer and each BrlR protomer consists of three parts, DNA-binding domain, a coiled-coil region and GyrI-like domain...
June 12, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28619035/an-evolutionary-optimization-of-a-rhodopsin-based-phototrophic-metabolism-in-escherichia-coli
#9
Hyun Aaron Kim, Hyun Ju Kim, Jihoon Park, Ah Reum Choi, Kyoo Heo, Haeyoung Jeong, Kwang-Hwan Jung, Yeong-Jae Seok, Pil Kim, Sang Jun Lee
BACKGROUND: The expression of the Gloeobacter rhodopsin (GR) in a chemotrophic Escherichia coli enables the light-driven phototrophic energy generation. Adaptive laboratory evolution has been used for acquiring desired phenotype of microbial cells and for the elucidation of basic mechanism of molecular evolution. To develop an optimized strain for the artificially acquired phototrophic metabolism, an ancestral E. coli expressing GR was adaptively evolved in a chemostat reactor with constant illumination and limited glucose conditions...
June 15, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28611182/the-lost-language-of-the-rna-world
#10
REVIEW
James W Nelson, Ronald R Breaker
The possibility of an RNA World is based on the notion that life on Earth passed through a primitive phase without proteins, a time when all genomes and enzymes were composed of ribonucleic acids. Numerous apparent vestiges of this ancient RNA World remain today, including many nucleotide-derived coenzymes, self-processing ribozymes, metabolite-binding riboswitches, and even ribosomes. Many of the most common signaling molecules and second messengers used by modern organisms are also formed from RNA nucleotides or their precursors...
June 13, 2017: Science Signaling
https://www.readbyqxmd.com/read/28607158/the-two-component-signal-transduction-system-vxrab-positively-regulates-vibrio-cholerae-biofilm-formation
#11
Jennifer K Teschler, Andrew T Cheng, Fitnat H Yildiz
Two-component signal transduction systems (TCSs), typically composed of a sensor histidine kinase (HK) and a response regulator (RR), are the primary mechanism by which pathogenic bacteria sense and respond to extracellular signals. The pathogenic bacterium Vibrio cholerae is no exception and encodes for 52 RR genes. Using in frame deletion mutants of each RR gene, we performed a systematic analysis of their role in V. cholerae biofilm formation. We determined that 7 RRs impacted expression of an essential biofilm gene and found that the recently characterized RR, VxrB, regulates expression of key structural and regulatory biofilm-genes in V...
June 12, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28607054/electron-shuttling-antibiotics-structure-bacterial-communities-by-modulating-cellular-levels-of-c-di-gmp
#12
Chinweike Okegbe, Blanche L Fields, Stephanie J Cole, Christopher Beierschmitt, Chase J Morgan, Alexa Price-Whelan, Richard C Stewart, Vincent T Lee, Lars E P Dietrich
Diverse organisms secrete redox-active antibiotics, which can be used as extracellular electron shuttles by resistant microbes. Shuttle-mediated metabolism can support survival when substrates are available not locally but rather at a distance. Such conditions arise in multicellular communities, where the formation of chemical gradients leads to resource limitation for cells at depth. In the pathogenic bacterium Pseudomonas aeruginosa PA14, antibiotics called phenazines act as oxidants to balance the intracellular redox state of cells in anoxic biofilm subzones...
June 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28601495/structural-and-enzymatic-characterization-of-a-camp-dependent-diguanylate-cyclase-from-pathogenic-leptospira-species
#13
Fernanda Nogales da Costa Vasconcelos, Nikolas Koshiyama Maciel, Denize Cristina Favaro, Luciana Coutinho de Oliveira, Angela Silva Barbosa, Roberto Kopke Salinas, Robson Francisco de Souza, Chuck Shaker Farah, Cristiane Rodrigues Guzzo
Leptospira interrogans serovar Copenhageni is a human pathogen that causes leptospirosis, a worldwide zoonosis. The L. interrogans genome codes for a wide array of potential diguanylate cyclase enzymes with characteristic GGDEF domains capable of synthesizing the cyclic dinucleotide c-di-GMP, known to regulate transitions between different cellular behavioural states in bacteria. Among such enzymes, LIC13137 (Lcd1), which has an N-terminal GAF domain and a C-terminal GGDEF domain, is notable for having close orthologs present only in pathogenic Leptospira species...
June 7, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28579350/azithromycin-modulates-3-5-cyclic-diguanylic-acid-signaling-in-pseudomonas-aeruginosa
#14
Soichiro Kimura, Nobuaki Mori, Toshihiro Kai, Yoshikazu Ishii, Keizo Yamaguchi, Kazuhiro Tateda
Macrolides have been reported to exert a variety of effects on both host immunomodulation and repression of bacterial pathogenicity. In this study, we report that the 3',5'-cyclic diguanylic acid (c-di-GMP) signaling system, which regulates virulence in Pseudomonas aeruginosa, is affected by the macrolide azithromycin. Using DNA microarray analysis, we selected a gene encoding PA2567 related to c-di-GMP metabolism that was significantly affected by azithromycin treatment. Expression of the PA2567 gene was significantly repressed by azithromycin in a time- and dose-dependent manner, whereas no difference in PA2567 gene expression was observed in the absence of azithromycin...
June 1, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/28559336/arac-like-transcriptional-activator-cuxr-binds-c-di-gmp-by-a-pilz-like-mechanism-to-regulate-extracellular-polysaccharide-production
#15
Simon Schäper, Wieland Steinchen, Elizaveta Krol, Florian Altegoer, Dorota Skotnicka, Lotte Søgaard-Andersen, Gert Bange, Anke Becker
Cyclic dimeric GMP (c-di-GMP) has emerged as a key regulatory player in the transition between planktonic and sedentary biofilm-associated bacterial lifestyles. It controls a multitude of processes including production of extracellular polysaccharides (EPSs). The PilZ domain, consisting of an N-terminal "RxxxR" motif and a β-barrel domain, represents a prototype c-di-GMP receptor. We identified a class of c-di-GMP-responsive proteins, represented by the AraC-like transcription factor CuxR in plant symbiotic α-proteobacteria...
June 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28542593/lack-of-the-pga-exopolysaccharide-in-salmonella-as-an-adaptive-trait-for-survival-in-the-host
#16
Maite Echeverz, Begoña García, Amaia Sabalza, Jaione Valle, Toni Gabaldón, Cristina Solano, Iñigo Lasa
Many bacteria build biofilm matrices using a conserved exopolysaccharide named PGA or PNAG (poly-β-1,6-N-acetyl-D-glucosamine). Interestingly, while E. coli and other members of the family Enterobacteriaceae encode the pgaABCD operon responsible for PGA synthesis, Salmonella lacks it. The evolutionary force driving this difference remains to be determined. Here, we report that Salmonella lost the pgaABCD operon after the divergence of Salmonella and Citrobacter clades, and previous to the diversification of the currently sequenced Salmonella strains...
May 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28539286/-expression-purification-and-activity-analysis-of-ggdef-and-eal-domain-containing-proteins-from-lactobacillus-acidophilus
#17
Jia-Hui He, Jie-Li Sun, Wen-Juan Yan, Fang Wang
OBJECTIVE: To identify the functions of the proteins containing the GGDEF or EAL domain in Lactobacillus acidophilus for investigation of the regulatory mechanism of c-di-GMP in this strain. METHODS: The DNA fragments of NH13_07045-GGDEF, NH13_07050 and NH13_07055 from Lactobacillus acidophilus ATCC4356 were amplified by PCR and cloned into the expression vector pMAL-His-c2. After sequencing, the recombinant plasmids were transformed into competent Escherichia coli cells, which were induced by IPTG to express the recombinant proteins fused with maltose binding protein (MBP)...
May 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28536559/new-functions-and-subcellular-localization-patterns-of-c-di-gmp-components-ggdef-domain-proteins-in-b-subtilis
#18
Patricia Bedrunka, Peter L Graumann
The universal and pleiotropic cyclic dinucleotide second messenger c-di-GMP is most prominently known to inversely regulate planktonic and sessile lifestyles of Gram-negative species. In the Gram-positive model organism Bacillus subtilis, intracellular c-di-GMP levels are modulated by a concise set of three diguanylate cylases (DgcK, DgcP, DgcW) and one phosphodiesterase (PdeH). Two recent studies have reported the negative influence of the c-di-GMP receptor DgrA (PilZ domain protein) on swarming motility indicating a conserved role of this second messenger across the bacterial domain...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28535292/adaptive-radiation-of-p-fluorescens-sbw25-in-experimental-microcosms-provides-an-understanding-of-the-evolutionary-ecology-and-molecular-biology-of-a-l-interface-biofilm-formation
#19
Anna Koza, Anna Kusmierska, Kimberley McLaughlin, Olena Moshynets, Andrew J Spiers
Combined experimental evolutionary and molecular biology approaches have been used to investigate the adaptive radiation of Pseudomonas fluorescens SBW25 in static microcosms leading to the colonisation of the air-liquid interface by biofilm-forming mutants such as the Wrinkly Spreader. In these microcosms, the ecosystem engineering of the early wild-type colonists establish the niche space for subsequent WS evolution and colonisation. Random WS mutations occurring in the developing population that de-regulate diguanylate cyclases and c-di-GMP homeostasis result in cellulose-based biofilms at the air-liquid interface...
May 23, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28517238/flen-and-fleq-play-a-synergistic-role-in-regulating-lapa-and-bcs-operons-in-pseudomonas-putida-kt2440
#20
Hailing Nie, Yujie Xiao, Huizhong Liu, Jinzhi He, Wenli Chen, Qiaoyun Huang
FleN generally functions as an antagonist of FleQ in regulating flagellar genes and biofilm matrix related genes in Pseudomonas aeruginosa. Here we found that in Pseudomonas putida KT2440, FleN and FleQ play a synergistic role in regulating two biofilm matrix coding operons, lapA and bcs. FleN deletion decreased transcription of lapA and increased transcription of bcs operon, the same trend was observed in fleQ deletion mutant before. In vitro experiments showed that FleN promoted binding of FleQ to the lapA/bcs promoter DNA especially in the presence of ATP...
May 18, 2017: Environmental Microbiology Reports
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