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Quorum Sensing
Published in Vineet Kumar, Vinod Kumar Garg, Sunil Kumar, Jayanta Kumar Biswas, Omics for Environmental Engineering and Microbiology Systems, 2023
Archisman Bhunia, Kumar Narayan, Abhilasha Singh, Asmeeta Sircar, Nivedita Chatterjee
Apart from the distinct quorum sensing inducers, another type of complex inducer is present in both gram-negative and gram-positive species, i.e., autoinducer-2 (AI-2) (Schauder et al, 2001; Xavier and Bassler, 2003). This AI-2, a furanosyl borate diester, is synthesized as a result of cleavage of the LuxS substrate S-adenosylmethionine and responds to cell density-dependent inter-species communication within the microbial niches (Subramani and Jayaprakashvel, 2019). A diverse inter-species cell-cell communication has been mentioned by Bassler (2002), which is regulated by AI-2. Some of these notable species mentioned are Vibrio harveyi, Shigella flexneri, Escherichia coli, Clostridium perfringens, Salmonella typhimurium, Borrelia burgdorferi, and Actinobacillus actinomycetemcomitans.
A review of quorum sensing regulating heavy metal resistance in anammox process: Relations, mechanisms and prospects
Published in Critical Reviews in Environmental Science and Technology, 2023
Caiyan Qu, Fan Feng, Jia Tang, Xi Tang, Di Wu, Ruiyang Xiao, Xiaobo Min, Chong-Jian Tang
The three QS signals drive multiple QS systems to regulate collective behaviors of anammox consortia. First, interactions between AHL, DSF and AI-2 induced the production of extracellular polymeric substances (EPS), facilitating biofilm formation. Second, microbiological and metabolomics analyses uncovered that AHL influenced bacterial activity by regulating electron shuttles, enhanced bacterial growth by modulating glycerophospholipid metabolism, and promoted floc aggregation by altering particle size distribution. Based on these metabolic regulations triggered by exogenous AHL, the specific anammox activity, nitrogen removal rate, and growth rate of anammox consortia significantly enhanced in the anammox process (Tang et al., 2018b). Third, anammox bacteria communicate with nitrifiers or heterotrophs to regulate nitrogen and amino acid recycling via the multiple QS systems. Therefore, QS exerts efficient regulation to biochemical behaviors of anammox consortia, achieving better nitrogen removal performance.
Structural variations on Salmonella biofilm by exposition to river water
Published in International Journal of Environmental Health Research, 2021
Contreras-Soto Mb, Medrano-Félix Ja, Sañudo-Barajas Ja, Vélez-de la Rocha R, Ibarra-Rodríguez Jr, Martínez-Urtaza J, Chaidez C, Castro-del Campo N
The presence of ribose, was detected in all strains and in all conditions, being higher in planktonic bacteria, where Typhimurium 14028 and Infantis Cli S-304 were the strains that had the greatest amount of this compound. The 5-carbon sugar ribose is an important component of nucleotides and is found in RNA; it is known that within the biofilm formation there are cells in the planktonic state and cells segmented to the exopolysaccharide matrix; this might explain the detection of ribose as a component of biofilms in this study. Interestingly, diverse studies demonstrated that D-ribose inhibited AI-2 (autoinducer 2) that induced biofilm growth and co-aggregation in Gram negative and Gram positive bacteria (Jang et al. 2013; Lee et al. 2015; Cho et al. 2016; Sintim and Gürsoy 2016; Liu L et al. 2017). There is no information about the role of ribose in Salmonella biofilms; however, the literature shows ribose as a biofilm inhibiting agent; therefore, these findings open an important source of opportunities to expand scientific search for knowledge about biofilm formation and composition in Salmonella and other enterobacterias.