Calponin
Calponin Homology Domain | |||||||||
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File:1WYP.png
CH domain from H.Sapiends Calponin 1. PDB 1wyp
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Identifiers | |||||||||
Symbol | CH | ||||||||
Pfam | PF00307 | ||||||||
Pfam clan | CL0188 | ||||||||
InterPro | IPR001715 | ||||||||
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calponin 1, basic, smooth muscle | |
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File:1WYP.png
Solution structure of the CH domain of human Calponin 1. Rainbow colored cartoon (N-terminus = blue, C-terminus = red).[1]
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Identifiers | |
Symbol | CNN1 |
Entrez | 1264 |
HUGO | 2155 |
OMIM | 600806 |
PDB | 1WYP |
RefSeq | NM_001299 |
UniProt | P51911 |
Other data | |
Locus | Chr. 19 p13.2-13.1 |
calponin 2 | |
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Identifiers | |
Symbol | CNN2 |
Entrez | 1265 |
HUGO | 2156 |
OMIM | 602373 |
RefSeq | NM_004368 |
UniProt | Q99439 |
Other data | |
Locus | Chr. 21 q11.1 |
calponin 3, acidic | |
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Identifiers | |
Symbol | CNN3 |
Entrez | 1266 |
HUGO | 2157 |
OMIM | 602374 |
RefSeq | NM_001839 |
UniProt | Q6FHA7 |
Other data | |
Locus | Chr. 1 p22-p21 |
Calponin is a calcium binding protein. Calponin tonically inhibits the ATPase activity of myosin in smooth muscle. Phosphorylation of calponin by a protein kinase, which is dependent upon calcium binding to calmodulin, releases the calponin's inhibition of the smooth muscle ATPase.
Structure and function
Calponin is mainly made up of α-helices with hydrogen bond turns. It is a binding protein and is made up of three domains. These domains in order of appearance are Calponin Homology (CH), regulatory domain (RD), and Click-23, domain that contains the calponin repeats. At the CH domain calponin binds to α-actin and filamin and binds to actin within the RD domain. Calmodulin, when activated by calcium may bind weakly to the CH domain and inhibit calponin binding with α-actin.[2] Calponin is responsible for binding many actin binding proteins, phospholipids, and regulates the actin/myosin interaction. Calponin is also thought to negatively affect the bone making process due to being expressed in high amounts in osteoblasts.[3]
References
External links
- Calponin at the US National Library of Medicine Medical Subject Headings (MeSH)
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