Protein
Complement C1s-B subcomponent
Function
C1s B chain is a serine protease that combines with C1q and C1r to form C1, the first component of the classical pathway of the complement system. C1r activates C1s so that it can, in turn, activate C2 and C4 (By similarity).
Similarity
Belongs to the peptidase S1 family.
Sequence
MWYLVLFSLLASFSAEPTMHGEILSPNYPQAYPNDVVKSWDIEVPEGFGIHLYFTHVDIEPSESCAYDSVQIISGGIEEGRLCGQRTSKSPNSPIIEEFQFPYNKLQVVFTSDFSIEEQFTGFAAYYTAIDVNECTDFTDVPCSHFCNNFIGGYFCSCPPEYFLHDDMRNCGVNCSGDVFTALIGEISSPNYPNPYPENSRCEYQIQLQEGFQVVVTMQREDFDVEPADSEGNCPDSLTFAAKNQQFGPYCGDGFPGPLTIRTQSNTLGIVFQTDLMGQKKGWKLRYHGDPISCPKESTANSNWEPDKAKYVFKDVVKITCVDGFEVVEGHVSSTSYYSTCQSDGQWSNSGLKCQPVYCGIPDPIANGKVEEPENSVFGTVIHYTCEEPYYYMEHEEGGEYRCAANGRWVNDQLGIELPRCIPVCGVPTEPFQVQQKIFGGQPAKIENFPWQVFFNHPTAGGALINEYWVLTAAHVVEKNSDPSMYAGITALRLADLENAQRLYTKRVIIHPGWKEDDDLNPRTNFDNDIALVQLKDPVKMGPKFSPICLPGTSSEYNLSPGDMGLISGWGRTEKRLHVINLRGAKVPVTSLETCKQVKEENPTARPEDYVITDNMICAGEKGVDSCKGDSGGAFAFQVPNVKAPKFYVAGLVSWGKKCGAYGVYTKVKNYVDWILKTMQENSGPRKD