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Immune evasion by a staphylococcal inhibitor of myeloperoxidase #MMPMID28808028
de Jong NWM; Ramyar KX; Guerra FE; Nijland R; Fevre C; Voyich JM; McCarthy AJ; Garcia BL; van Kessel KPM; van Strijp JAG; Geisbrecht BV; Haas PJA
Proc Natl Acad Sci U S A 2017[Aug]; 114 (35): 9439-44 PMID28808028show ga
Staphylococcus aureus secretes numerous proteins to evade our innate immune system, for example to evade opsonization and phagocytosis by neutrophils. Here we describe the discovery that S. aureus has evolved a protein, called SPIN, that specifically binds and inhibits the human myeloperoxidase enzyme (MPO). MPO is located inside the granules of neutrophils and is important in the oxidative burst against pathogens. We identify the molecular mode of action of SPIN inhibiting MPO, illustrate this with the cocrystal structure, and show that SPIN is important for bacterial survival by MPO-dependent killing. Our study shows that S. aureus fights back after it is engulfed by neutrophils, which will help our understanding of the complex nature of S. aureus infections.