title: Two type IV secretion systems with different functions in Burkholderia cenocepacia K56-2.
abstract: Bacterial type IV secretion systems (T4SS) perform two fundamental functions related to pathogenesis: the delivery of effector molecules to eukaryotic target cells, and genetic exchange. Two T4SSs have been identified in Burkholderia cenocepacia K56-2, a representative of the ET12 lineage of the B. cepacia complex (Bcc). The plant tissue watersoaking (Ptw) T4SS encoded on a resident 92 kb plasmid is a chimera composed of VirB/D4 and F-specific subunits, and is responsible for the translocation of effector(s) that have been linked to the Ptw phenotype. The bc-VirB/D4 system located on chromosome II displays homology to the VirB/D4 T4SS of Agrobacterium tumefaciens. In contrast to the Ptw T4SS, the bc-VirB/D4 T4SS was found to be dispensable for Ptw effector(s) secretion, but was found to be involved in plasmid mobilization. The fertility inhibitor Osa did not affect the secretion of Ptw effector(s) via the Ptw system, but did disrupt the mobilization of a RSF1010 derivative plasmid.
authors.affiliation: Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77840, USA.
authors.forename: Ruifu
authors.initials: R
authors.lastname: Zhang
authors.affiliation: Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
authors.forename: John J
authors.initials: JJ
authors.lastname: LiPuma
authors.affiliation: Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77840, USA.
authors.forename: Carlos F
authors.initials: CF
authors.lastname: Gonzalez
mesh_terms: D016960:Agrobacterium tumefaciens / Q000235:genetics / Q000502:physiology; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D001483:Base Sequence; D042602:Burkholderia cepacia complex / Q000235:genetics / Q000472:pathogenicity / Q000502:physiology*; D004269:DNA, Bacterial / Q000235:genetics; D005798:Genes, Bacterial; D005816:Genetic Complementation Test; D016297:Mutagenesis, Site-Directed; D019697:Onions / Q000382:microbiology; D010957:Plasmids / Q000235:genetics; D013045:Species Specificity
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial