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- W1561282483 abstract "The interactions between Factor B (B), its activation products Ba and Bb, properdin (P) and C3i or C3b, components that together form the alternative-pathway C3 convertase enzyme of human complement, have been analysed. Fluid-phase complexes of the purified components C3i, B and P were probed with the homobifunctional cross-linking reagent disuccinimidyl tartarate, and efficient cross-linking of B to P was observed. The 140 kDa B-P conjugate formed was cleaved by Factor D to yield a single product of 85 kDa. This is consistent with a Ba-P heterodimer, and suggests that the initial interaction of B and P includes an interaction of P with the Ba domain of intact B. (The Ba fragment is not retained in the active P-stabilized complex, C3bBbP). By contrast, no cross-linking of P to the Bb domain of B could be demonstrated. Binding studies on cellular intermediates also provided evidence for a site of interaction between B and P, with high concentrations of B inhibiting P binding to EAC3b (sheep erythrocytes coated with antibody and C3b). Neither isolated Ba nor Bb had any effect on the P-EAC3b interaction. High concentrations of B also accelerated the decay of the functional EAC3bBbP complex. These data indicate that the positive co-operativity of binding to C3i or to C3b between B and P is mediated, at least in part, through a direct interaction between B and P." @default.
- W1561282483 created "2016-06-24" @default.
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- W1561282483 date "1988-08-01" @default.
- W1561282483 modified "2023-09-23" @default.
- W1561282483 title "Analysis of the interaction between properdin and factor B, components of the alternative-pathway C3 convertase of complement" @default.
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- W1561282483 doi "https://doi.org/10.1042/bj2530667" @default.
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