Journal
ANNUAL REVIEW OF MICROBIOLOGY
Volume 77, Issue -, Pages 213-231Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-micro-032521-030537
Keywords
Ralstonia solanacearum; Ralstonia pseudosolanacearum; cell-cell communication; quorum sensing; pathogenicity; virulence
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Ralstonia solanacearum species complex (RSSC) strains are devastating plant pathogens distributed worldwide. The primary cell density-dependent gene expression system in RSSC strains is phc quorum sensing (QS), which regulates the expression of about 30% of all genes. The specificity in generating and receiving its QS signal, but their signaling pathways might not differ significantly. This review discusses the genetic and biochemical factors involved in QS signal input, the regulatory network, and the interactions with soil fungi.
Ralstonia solanacearum species complex (RSSC) strains are devastating plant pathogens distributed worldwide. The primary cell density-dependent gene expression system in RSSC strains is phc quorum sensing (QS). It regulates the expression of about 30% of all genes, including those related to cellular activity, primary and secondary metabolism, pathogenicity, and more. The phc regulatory elements encoded by the phcBSRQ operon and phcA gene play vital roles. RSSC strains use methyl 3-hydroxymyristate (3-OH MAME) or methyl 3-hydroxypalmitate (3-OH PAME) as the QS signal. Each type of RSSC strain has specificity in generating and receiving its QS signal, but their signaling pathways might not differ significantly. In this review, I describe the genetic and biochemical factors involved in QS signal input and the regulatory network and summarize control of the phc QS system, new cell-cell communications, and QS-dependent interactions with soil fungi.
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