title: A general role for the lux autoinducer in bacterial cell signalling: control of antibiotic biosynthesis in Erwinia.
abstract: Micro-organisms have evolved complex and diverse mechanisms to sense environmental changes. Activation of a sensory mechanism typically leads to alterations in gene expression facilitating an adaptive response. This may take several forms, but many are mediated by response-regulator proteins. The luxR-encoded protein (LuxR) has previously been characterised as a member of the response-regulator superfamily and is known to respond to the small diffusible autoinducer signal molecule N-(beta-ketocaproyl) homoserine lactone (KHL). Observed previously in only a few marine bacteria, we now report that KHL is in fact produced by a diverse group of terrestrial bacteria. In one of these (Erwinia carotovora), we show that it acts as a molecular control signal for the expression of genes controlling carbapenem antibiotic biosynthesis. This represents the first substantive evidence to support the previous postulate that the lux autoinducer, KHL, is widely involved in bacterial signalling.
authors.affiliation: Department of Pharmaceutical Sciences, University of Nottingham, University Park, U.K.
authors.forename: N J
authors.initials: NJ
authors.lastname: Bainton
authors.forename: B W
authors.initials: BW
authors.lastname: Bycroft
authors.forename: S R
authors.initials: SR
authors.lastname: Chhabra
authors.forename: P
authors.initials: P
authors.lastname: Stead
authors.forename: L
authors.initials: L
authors.lastname: Gledhill
authors.forename: P J
authors.initials: PJ
authors.lastname: Hill
authors.forename: C E
authors.initials: CE
authors.lastname: Rees
authors.forename: M K
authors.initials: MK
authors.lastname: Winson
authors.forename: G P
authors.initials: GP
authors.lastname: Salmond
authors.forename: G S
authors.initials: GS
authors.lastname: Stewart
mesh_terms: D015107:4-Butyrolactone / Q000031:analogs & derivatives* / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics*; D015780:Carbapenems / Q000096:biosynthesis*; D002851:Chromatography, High Pressure Liquid; D015964:Gene Expression Regulation, Bacterial / Q000502:physiology*; D009876:Operon / Q000235:genetics; D016973:Pectobacterium carotovorum / Q000235:genetics*; D012097:Repressor Proteins; D015534:Trans-Activators; D014157:Transcription Factors / Q000235:genetics
chemical_list: D001426:Bacterial Proteins; D015780:Carbapenems; D012097:Repressor Proteins; D015534:Trans-Activators; D014157:Transcription Factors; C064778:LuxR autoinducer binding proteins; C030654:N-(3-oxohexanoyl)-3-aminodihydro-2(3H)-furanone; D015107:4-Butyrolactone