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- W2071336102 abstract "Virulent group A streptococci have been found to express a cell-surface factor that has the capability of inactivating complement-derived chemotactic factors. To determine the mechanism of action of this factor, we examined the interaction of purified inactivator with pure C5a chemotaxin. Ligand-receptor binding studies demonstrated that streptococcal chemotactic factor inactivator (SCFI)-treated C5a expressed a greatly reduced ability to bind to receptors of polymorphonuclear leukocytes as compared with native C5a. The inactivation of C5a occurred by a nonstoichiometric and temperature-dependent process. NaDodSO4/PAGE analysis indicated that SCFI mediated a small decrease in the molecular weight of C5adesArg, and sequencing of the carboxyl terminus of inactivated C5a demonstrated that a six-residue peptide was lost. The release of discrete peptide fragments from denatured bovine serum albumin upon prolonged incubation with SCFI was indicative of endoprotease activity. Although denatured bovine serum albumin was inefficiently cleaved, native bovine serum albumin and other native proteins were highly resistant to SCFI proteolysis; this indicated that activity was specific in nature." @default.
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- W2071336102 date "1985-12-01" @default.
- W2071336102 modified "2023-09-28" @default.
- W2071336102 title "Mechanism of action of the group A streptococcal C5a inactivator." @default.
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- W2071336102 doi "https://doi.org/10.1073/pnas.82.23.8144" @default.
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