title: Genomic and phenotypic characterization of a nonpigmented variant of Pantoea vagans biocontrol strain C9-1 lacking the 530-kb megaplasmid pPag3.
abstract: A 530-kb megaplasmid pPag3 contributing 10.8% of the total genome of Pantoea vagans biocontrol strain C9-1 was sequenced. A rare nonpigmented variant C9-1W was obtained and shown to have lost pPag3, but retained all other plasmids (pPag1, pPag2). Phenotypic characterization of the variant confirmed the function of several annotated genes that may influence ecological fitness and efficacy. Metabolic profiling revealed important plasmid-based carbon utilization phenotypes. Plasmid loss resulted in thiamine auxotrophy, absence of carotenoid pigmentation, desferrioxamine diffusible siderophore biosynthesis, inherent ampicillin resistance and expression of AI-1 quorum-sensing signaling. This confirmed the functional expression of the corresponding genes located on pPag3 in P. vagans.
authors.affiliation: Division of Plant Protection, Agroscope Changins-Wädenswil ACW, Wädenswil, Switzerland. theo.smits@acw.admin.ch
authors.forename: Theo H M
authors.initials: TH
authors.lastname: Smits
authors.forename: Fabio
authors.initials: F
authors.lastname: Rezzonico
authors.forename: Cosima
authors.initials: C
authors.lastname: Pelludat
authors.forename: Alexander
authors.initials: A
authors.lastname: Goesmann
authors.forename: Jürg E
authors.initials: JE
authors.lastname: Frey
authors.forename: Brion
authors.initials: B
authors.lastname: Duffy
mesh_terms: D000668:Ampicillin Resistance; D002244:Carbon / Q000378:metabolism; D002338:Carotenoids / Q000096:biosynthesis; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics*; D003676:Deferoxamine / Q000378:metabolism; D005798:Genes, Bacterial; D007501:Iron / Q000378:metabolism; D053858:Metabolic Networks and Pathways / Q000235:genetics; D008969:Molecular Sequence Data; D020636:Pantoea / Q000235:genetics* / Q000378:metabolism*; D010957:Plasmids; D053038:Quorum Sensing; D017422:Sequence Analysis, DNA; D013831:Thiamine / Q000096:biosynthesis
chemical_list: D004269:DNA, Bacterial; D002338:Carotenoids; D002244:Carbon; D007501:Iron; D003676:Deferoxamine; D013831:Thiamine