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Title: Immune evasion by a staphylococcal inhibitor of myeloperoxidase

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

Staphylococcus aureus is highly adapted to its host and has evolved many strategies to resist opsonization and phagocytosis. Even after uptake by neutrophils, S. aureus shows resistance to killing, which suggests the presence of phagosomal immune evasion molecules. With the aid of secretome phage display, we identified a highly conserved protein that specifically binds and inhibits human myeloperoxidase (MPO), a major player in the oxidative defense of neutrophils. We have named this protein “staphylococcal peroxidase inhibitor” (SPIN). To gain insight into inhibition of MPO by SPIN, we solved the cocrystal structure of SPIN bound to a recombinant form of human MPO at 2.4-Å resolution. This structure reveals that SPIN acts as a molecular plug that prevents H2O2 substrate access to the MPO active site. In subsequent experiments, we observed that SPIN expression increases inside the neutrophil phagosome, where MPO is located, compared with outside the neutrophil. Furthermore, bacteria with a deleted gene encoding SPIN showed decreased survival compared with WT bacteria after phagocytosis by neutrophils. Taken together, our results demonstrate that S. aureus secretes a unique proteinaceous MPO inhibitor to enhance survival by interfering with MPO-mediated killing.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institutes of Health (NIH); ZonMw Grant
Grant/Contract Number:
W-31-109-Eng-38; AI111203; GM121511; R01AI1090046; PAR98-072; RR020185; 205200004
OSTI ID:
1408117
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, Issue 35; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 58 works
Citation information provided by
Web of Science

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Cited By (6)

1H, 15N, and 13C resonance assignments of the third domain from the S. aureus innate immune evasion protein Eap journal January 2018
Intracellular Pathogens: Host Immunity and Microbial Persistence Strategies journal April 2019
Immune Signaling Networks: Sources of Robustness and Constrained Evolvability during Coevolution journal December 2017
Aspartic Acid Residue 51 of SaeR Is Essential for Staphylococcus aureus Virulence journal December 2018
A transgenic zebrafish line for in vivo visualisation of neutrophil myeloperoxidase journal April 2019
Messing with the Sentinels—The Interaction of Staphylococcus aureus with Dendritic Cells journal August 2018