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The C3 convertase of the classical pathway of complement is composed of fragments C4b and C2a resulting from cleavage of C4 and C2 by activated C1. The limited proteolysis of these two different substrates by the same protease, C1s, has been studied in the fluid phase using purified proteins. The turnover numbers of C2 and C4 cleavage by C1s were affected to different extents, depending on whether...
Heating of the serpin C1-inhibitor above 55°C induced the formation of inactive polymers. Western blotting of non-denaturing gels showed that the polymers bound to the conformation specific monoclonal antibody 4C3, suggesting that a similar conformational change to that occurring in complexed or cleaved inhibitor had taken place. N-Terminal analysis of tryptic peptides which bound to 4C3 showed that...
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