title: Roles of cell division control factor SdiA: recognition of quorum sensing signals and modulation of transcription regulation targets.
abstract: In Gram-negative bacteria, N-acylhomoserine lactone (HSL) is used as a signal in cell-cell communication and quorum sensing (QS). The model prokaryote Escherichia coli lacks the system of HSL synthesis, but is capable of monitoring HSL signals in environment. Transcription factor SdiA for cell division control is believed to play a role as a HSL sensor. Using a collection of 477 species of chemically synthesized HSL analogues, we identified three synthetic signal molecules (SSMs) that bind in vitro to purified SdiA. After SELEX-chip screening of SdiA-binding DNA sequences, a striking difference was found between these SSMs in the pattern of regulation target genes on the E. coli genome. Based on Northern blot analysis in vivo, a set of target genes were found to be repressed by SdiA in the absence of effectors and derepressed by the addition of SSMs. Another set of genes were, however, expressed in the absence of effector ligands but repressed by the addition of SSMs. Taken together, we propose that the spectrum of taget gene selection by SdiA is modulated in multiple modes depending on the interacting HSL-like signal molecules.
authors.affiliation: Department of Frontier Bioscience, Hosei University, Koganei, Tokyo, 184-8584, Japan; Research Center for Micro-Nano Technology, Hosei University, Koganei, Tokyo, 184-8584, Japan; Chemical Resources Laboratory, Tokyo Institute of Technology, Nagatsuda, Yokohama, 226-8503, Japan.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Shimada
authors.forename: Kaori
authors.initials: K
authors.lastname: Shimada
authors.forename: Makoto
authors.initials: M
authors.lastname: Matsui
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Kitai
authors.forename: Jun
authors.initials: J
authors.lastname: Igarashi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Suga
authors.forename: Akira
authors.initials: A
authors.lastname: Ishihama
mesh_terms: D054742:Acyl-Butyrolactones / Q000737:chemistry* / Q000494:pharmacology; D002455:Cell Division / Q000502:physiology*; D004269:DNA, Bacterial / Q000737:chemistry; D048168:Escherichia coli K12 / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D029968:Escherichia coli Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D016680:Genome, Bacterial; D053038:Quorum Sensing / Q000235:genetics*; D015534:Trans-Activators / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
chemical_list: D054742:Acyl-Butyrolactones; D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; D015534:Trans-Activators; C490806:sdiA protein, E coli