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Dissection of homologous translocon operons reveals a distinct role for YopD in type III secretion by Yersinia pseudotuberculosis

¹ Department of Medical Countermeasures, Swedish Defence Research Agency, FOI NBC-Defence, SE-901 82 Umeå, Sweden
² Department of Molecular Biology, Umeå University, SE-901 87 Umeå, Sweden

Correspondence
Matthew S. Francis
matthew.francis{at}molbiol.umu.se

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 yopB 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 yopD 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.

The nucleotide sequence of the pcrGVHpopBD operon of Pseudomonas aeruginosa PAK has been deposited in GenBank under accession number AY232997.

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