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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...
Polyubiquitinated proteins tagged with multi-ubiquitin chains are substrates preferred by the 26 S proteasome (a ubiquitin/ATP-dependent proteolytic complex). Here, we developed a simple method for the efficient preparation of polyubiquitinated proteins which are degraded by the 26 S proteasome in an ATP-dependent manner. Our efficient method enabled us to produce ten monoclonal antibodies that recognized...
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