title: Dissection of homologous translocon operons reveals a distinct role for YopD in type III secretion by Yersinia pseudotuberculosis.
abstract: The homologous pcrGVHpopBD and lcrGVHyopBD translocase operons of Pseudomonas aeruginosa and pathogenic Yersinia spp., respectively, are responsible for the translocation of anti-host effectors into the cytosol of infected eukaryotic cells. In Yersinia, this operon is also required for yop-regulatory control. To probe for key molecular interactions during the infection process, the functional interchangeability of popB/yopB and popD/yopD was investigated. Secretion of PopB produced in trans in a deltayopB null mutant of Yersinia was only observed when co-produced with its native chaperone PcrH, but this was sufficient to complement the yopB translocation defect. The Yersinia deltayopD null mutant synthesized and secreted PopD even in the absence of native PcrH, yet this did not restore YopD-dependent yop-regulatory control or effector translocation. Thus, this suggests that key residues in YopD, which are not conserved in PopD, are essential for functional Yersinia type III secretion.
authors.affiliation: Department of Molecular Biology, Umeå University, SE-901 87 Umeå, Sweden.|Department of Medical Countermeasures, Swedish Defence Research Agency, FOI NBC-Defence, SE-901 82 Umeå, Sweden.
authors.forename: Jeanette E
authors.initials: JE
authors.lastname: Bröms
authors.affiliation: Department of Molecular Biology, Umeå University, SE-901 87 Umeå, Sweden.|Department of Medical Countermeasures, Swedish Defence Research Agency, FOI NBC-Defence, SE-901 82 Umeå, Sweden.
authors.forename: Anna-Lena
authors.initials: AL
authors.lastname: Forslund
authors.affiliation: Department of Molecular Biology, Umeå University, SE-901 87 Umeå, Sweden.|Department of Medical Countermeasures, Swedish Defence Research Agency, FOI NBC-Defence, SE-901 82 Umeå, Sweden.
authors.forename: Åke
authors.initials: Å
authors.lastname: Forsberg
authors.affiliation: Department of Molecular Biology, Umeå University, SE-901 87 Umeå, Sweden.
authors.forename: Matthew S
authors.initials: MS
authors.lastname: Francis
mesh_terms: D001425:Bacterial Outer Membrane Proteins / Q000235:genetics* / Q000378:metabolism / Q000502:physiology*; D016680:Genome, Bacterial; D006367:HeLa Cells; D006801:Humans; D008969:Molecular Sequence Data; D009876:Operon / Q000502:physiology*; D011550:Pseudomonas aeruginosa / Q000235:genetics / Q000472:pathogenicity; D017385:Sequence Homology; D015011:Yersinia pseudotuberculosis / Q000235:genetics* / Q000378:metabolism
chemical_list: D001425:Bacterial Outer Membrane Proteins; C078910:YopD protein, Yersinia