Phagocytosis Escape by a Staphylococcus aureus Protein That Connects Complement and Coagulation Proteins at the Bacterial Surface.
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Authors
Ko, Ya-PingKuipers, Annemarie
Freitag, Claudia M
Jongerius, Ilse
Medina, Eva
van Rooijen, Willemien J
Spaan, András N
van Kessel, Kok P M
Höök, Magnus
Rooijakkers, Suzan H M
Issue Date
2013-12
Metadata
Show full item recordAbstract
Upon contact with human plasma, bacteria are rapidly recognized by the complement system that labels their surface for uptake and clearance by phagocytic cells. Staphylococcus aureus secretes the 16 kD Extracellular fibrinogen binding protein (Efb) that binds two different plasma proteins using separate domains: the Efb N-terminus binds to fibrinogen, while the C-terminus binds complement C3. In this study, we show that Efb blocks phagocytosis of S. aureus by human neutrophils. In vitro, we demonstrate that Efb blocks phagocytosis in plasma and in human whole blood. Using a mouse peritonitis model we show that Efb effectively blocks phagocytosis in vivo, either as a purified protein or when produced endogenously by S. aureus. Mutational analysis revealed that Efb requires both its fibrinogen and complement binding residues for phagocytic escape. Using confocal and transmission electron microscopy we show that Efb attracts fibrinogen to the surface of complement-labeled S. aureus generating a 'capsule'-like shield. This thick layer of fibrinogen shields both surface-bound C3b and antibodies from recognition by phagocytic receptors. This information is critical for future vaccination attempts, since opsonizing antibodies may not function in the presence of Efb. Altogether we discover that Efb from S. aureus uniquely escapes phagocytosis by forming a bridge between a complement and coagulation protein.Citation
Phagocytosis Escape by a Staphylococcus aureus Protein That Connects Complement and Coagulation Proteins at the Bacterial Surface. 2013, 9 (12):e1003816 PLoS Pathog.Affiliation
RG Infection immunology, Helmholtz Centre for infection research (HZI), Inhoffenstr. 7, D-38125 Braunschweig, GermanyJournal
PLoS pathogensPubMed ID
24348255Type
ArticleLanguage
enISSN
1553-7374ae974a485f413a2113503eed53cd6c53
10.1371/journal.ppat.1003816
Scopus Count
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