title: Inactivation of Peroxiredoxin 6 by the Pla Protease of Yersinia pestis.
abstract: Pneumonic plague represents the most severe form of disease caused by Yersinia pestis due to its ease of transmission, rapid progression, and high mortality rate. The Y. pestis outer membrane Pla protease is essential for the development of pneumonic plague; however, the complete repertoire of substrates cleaved by Pla in the lungs is not known. In this study, we describe a proteomic screen to identify host proteins contained within the bronchoalveolar lavage fluid of mice that are cleaved and/or processed by Y. pestis in a Pla-dependent manner. We identified peroxiredoxin 6 (Prdx6), a host factor that contributes to pulmonary surfactant metabolism and lung defense against oxidative stress, as a previously unknown substrate of Pla. Pla cleaves Prdx6 at three distinct sites, and these cleavages disrupt both the peroxidase and phospholipase A2 activities of Prdx6. In addition, we found that infection with wild-type Y. pestis reduces the abundance of extracellular Prdx6 in the lungs compared to that after infection with Δpla Y. pestis, suggesting that Pla cleaves Prdx6 in the pulmonary compartment. However, following infection with either wild-type or Δpla Y. pestis, Prdx6-deficient mice exhibit no differences in bacterial burden, host immune response, or lung damage from wild-type mice. Thus, while Pla is able to disrupt Prdx6 function in vitro and reduce Prdx6 levels in vivo, the cleavage of Prdx6 has little detectable impact on the progression or outcome of pneumonic plague.
authors.affiliation: Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
authors.forename: Daniel L
authors.initials: DL
authors.lastname: Zimbler
authors.affiliation: Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
authors.forename: Justin L
authors.initials: JL
authors.lastname: Eddy
authors.affiliation: Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
authors.forename: Jay A
authors.initials: JA
authors.lastname: Schroeder
authors.affiliation: Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA lathem@northwestern.edu.
authors.forename: Wyndham W
authors.identifier: http://orcid.org/0000-0003-4347-089X
authors.initials: WW
authors.lastname: Lathem
mesh_terms: D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry; D018450:Disease Progression; D005260:Female; D008168:Lung / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009195:Peroxidase / Q000378:metabolism; D054465:Peroxiredoxin VI / Q000378:metabolism*; D054467:Phospholipases A2 / Q000378:metabolism; D010930:Plague / Q000382:microbiology; D010960:Plasminogen Activators / Q000235:genetics / Q000378:metabolism*; D015010:Yersinia pestis / Q000235:genetics / Q000276:immunology / Q000378:metabolism*
chemical_list: D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D054465:Peroxiredoxin VI; C515983:Prdx6 protein, mouse; D009195:Peroxidase; D054467:Phospholipases A2; C078140:Pla protease, Yersinia pestis; D010960:Plasminogen Activators