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Complement receptor type 1 (CR1 or CD35) is a multiple modular protein that mediates the immune adherence phenomenon, a fundamental event for destroying microbes and initiating an immunological response. It fulfills this role through binding C3b/C4b-opsonized foreign antigens. The structure of the principal C3b/C4b binding site (residues 901-1095) of CR1 is reported, revealing three complement control...
Vaccinia virus complement control protein (VCP) inhibits both pathways of complement activation through binding the third and fourth components. A homolog of mammalian regulators of complement activation, its ability to bind heparin endows VCP with additional activities of significance to viral infectivity. The structure of VCP reveals a highly extended molecule with a putative heparin recognition...
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