Plasmids are mobile DNAs that can adjust host cell functions for their own amplification and dissemination. We identified Quorum sensing flagella small RNA regulator (QfsR), a small RNA, transcribed from the virulence tumour-inducing (Ti) plasmid in the phytopathogen Agrobacterium fabrum. QfsR is widely conserved throughout RepABC plasmids carried by Rhizobiaceae.
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