Binding of protein S to C4b-binding protein. Mutagenesis of protein S.
نویسندگان
چکیده
منابع مشابه
Protein S enhances C4b binding protein interaction with neutrophils.
Protein S, an inhibitor of coagulation, interacts reversibly with C4b binding protein (C4bBP). The physiologic role of this complex formation remains unknown. In this study we examined the possibility that protein S would facilitate C4bBP binding to the surface of neutrophils where, in turn, this complex could help protect the cell from complement-mediated damage at the site of inflammation. Ne...
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We screened 29 strains of Neisseria gonorrhoeae and found 16/21 strains that resisted killing by normal human serum and 0/8 serum sensitive strains that bound the complement regulator, C4b-binding protein (C4bp). Microbial surface-bound C4bp demonstrated cofactor activity. We constructed gonococcal strains with hybrid porin (Por) molecules derived from each of the major serogroups (Por1A and Po...
متن کاملNovel subunit in C4b-binding protein required for protein S binding.
C4b-binding protein (C4BP) is a multimeric protein with regulatory functions in the complement system. It also interacts with vitamin K-dependent protein S, which is involved in the regulation of the coagulation system. It has been demonstrated that C4BP consists of seven disulfide-linked, identical 70-kDa subunits, which are arranged to give the molecule a spider-like structure. We now have ev...
متن کاملLow total protein S antigen but high protein S activity due to decreased C4b-binding protein in neonates.
Protein S, a vitamin K-dependent cofactor for activated protein C, exists in normal adult plasma in a free anticoagulantly active form and in an inactive form complexed to C4b-binding protein. Immunologic and functional levels of protein S and C4b-binding protein in plasma were determined for 20 newborn infants and compared with adult normal pooled plasma. Total protein S antigen levels average...
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The carboxy-terminal region of protein S has been recently been observed to be involved in the interaction between protein S and C4b-binding protein (Walker, F. J. 1989. J. Biol. Chem. 264:17645-17658). A synthetic peptide, GVQLDLDEAI, corresponding to that region of protein S has been used to investigate the protein S/C4b-binding protein interaction in vitro and in vivo. Rabbit activated prote...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1992
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)42418-0