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Xanthomonas campestris DSF autoinduction. RpfC inhibits the activity of the DSF synthase RpfF at low cell density. As the cell density increases and basal DSF production allows for signal accumulation, an RpfC conformational change mediated by DSF promotes the release of RpfF to synthesize more DSF and also to initiate phosphorelay from RpfC to RpfG, which will trigger the expression of target genes in the DSF regulon (adapted from He & Zhang 2008).
