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LCCL domain
In molecular biology, the LCCL domain is a protein domain which has been named after several well-characterised proteins that were found to contain it, namely Limulus clotting factor C, Coch-5b2 (Cochlin) and Lgl1. It is an about 100 amino acids domain whose C-terminal part contains a highly conserved histidine in a conserved motif YxxxSxxCxAAVHxGVI. The LCCL module is thought to be an autonomously folding domain that has been used for the construction of various modular proteins through exon-shuffling. It has been found in various metazoan proteins in association with complement B-type domains, C-type lectin domains, von Willebrand type A domains, CUB domains, discoidin lectin domains or CAP domains. It has been proposed that the LCCL domain could be involved in lipopolysaccharide (LPS) binding. Secondary structure prediction suggests that the LCCL domain contains six beta strands and two alpha helices.〔
Some proteins known to contain a LCCL domain include Limulus factor C, an LPS endotoxin-sensitive trypsin type serine protease which serves to protect the organism from bacterial infection; vertebrate cochlear protein cochlin or coch-5b2 (Cochlin is probably a secreted protein, mutations affecting the LCCL domain of coch-5b2 cause the deafness disorder DFNA9 in humans); and mammalian late gestation lung protein Lgl1, contains two tandem copies of the LCCL domain.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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