Calponin repeat
IPR000557
Definition
Calponin [[cite:PMID:8130072], [cite:PMID:8144658]] is a thin filament-associated protein that is implicated in the regulation and modulation of smooth muscle contraction. It is capable of binding to actin, calmodulin, troponin C and tropomyosin. The interaction of calponin with actin inhibits the actomyosin MgATPase activity. Calponin is a basic protein of approximately 34 Kd. Multiple isoforms are found in smooth muscles. Calponin contains three repeats of a well conserved 26 amino acid domain. Such a domain is also found in vertebrate smooth muscle protein (SM22 or transgelin), and a number of other proteins whose physiological role is not yet established, including Drosophila synchronous flight muscle protein SM20, Caenorhabditis elegans unc-87 protein PMID:7929573, rat neuronal protein NP25 PMID:8015377, and an Onchocerca volvulus antigen PMID:7935620.
6 human proteins with this domain
Each is a reviewed human protein in the Seroatlas serome and a potential autoantibody target; this domain groups them into one antibody-relevant category. Every entry links to its own record.
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