Biofilm formation in empowers the bacteria to lead a dual lifestyle and enhances its infectivity. While the formation and dispersal of the biofilm involves multiple components-both proteinaceous and non-proteinaceous, the key to the regulatory control lies with the ubiquitous secondary signaling molecule, cyclic-di-GMP (c-di-GMP). A number of different cellular components may interact with c-di-GMP, but the onus of synthesis of this molecule lies with a class of enzymes known as diguanylate cyclases (DGCs). DGC activity is generally associated with proteins possessing a GGDEF domain, ubiquitously present across all bacterial systems. is also endowed with multiple DGCs and information about some of them have been pouring in over the past decade. This review summarizes the DGCs confirmed till date in , and emphasizes the importance of DGCs and their product, c-di-GMP in the virulence and lifecycle of the bacteria.
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http://dx.doi.org/10.3389/fcimb.2020.582947 | DOI Listing |
bioRxiv
December 2024
Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA.
Surface sensing is a key aspect of the early stage of biofilm formation. For , the type IV pili (TFP), the TFP alignment complex and PilY1 were shown to play a key role in c-di-GMP signaling upon surface contact. The role of the flagellar machinery in surface sensing is less well understood in .
View Article and Find Full Text PDFProc Biol Sci
December 2024
Department of Molecular Biology, Umeå University, Umeå, Sweden.
Improving evolutionary forecasting requires progressing from studying repeated evolution of a single genotype under identical conditions to formulating broad principles. These principles should enable predictions of how similar species will adapt to similar selective pressures. Evolve-and-resequence experiments with multiple species allow testing forecasts on different biological levels and elucidating the causes for failed predictions.
View Article and Find Full Text PDFJ Microbiol Immunol Infect
November 2024
Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan; Research Center for Cancer Biology, China Medical University, Taichung, Taiwan. Electronic address:
Background: Vibrio vulnificus is a Gram-negative pathogen that infects humans through foodborne or wound infections. Victims of V. vulnificus infections face significant health risks, including cellulitis and septicemia, which have rapid disease progression and high mortality rates.
View Article and Find Full Text PDFAppl Environ Microbiol
November 2024
National Key Laboratory of Agricultural Microbiology, Huazhong Agriculture University, Wuhan, China.
The overuse and wanton discharge of antibiotics produces a threat to bacteria in the environment, which, in turn, stimulates the more rapid emergence of antibiotic-resistant bacteria. actively forms biofilms to protect the population under tetracycline stress, but the molecular mechanism remains unclear. This study found that tetracycline at sub-minimal inhibitory concentrations increased cyclic diguanylate (c-di-GMP), a second messenger that positively regulates biofilm formation.
View Article and Find Full Text PDFbioRxiv
November 2024
Interfaculty Institute of Microbiology and Infection Medicine, Organismic Interactions Department, Cluster of Excellence "Controlling Microbes to Fight Infections", Eberhard Karls University of Tübingen, 72076 Tübingen, Germany.
Cyclic dimeric GMP (c-di-GMP) is a widespread bacterial second messenger that controls a variety of cellular functions, including protein and polysaccharide secretion, motility, cell division, cell development, and biofilm formation, and contributes to the virulence of some important bacterial pathogens. While the genes for diguanylate cyclases and c-di-GMP hydrolases (active or mutated) can be easily identified in microbial genomes, the list of c-di-GMP receptor domains is quite limited, and only two of them, PliZ and MshEN, are found across multiple bacterial phyla. Recently, a new c-di-GMP receptor protein, named CdgR or ComFB, has been identified in cyanobacteria and shown to regulate their cell size and, more recently, natural competence.
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