Calponin homology domain

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Calponin homology (CH) domain
Solution structure of calponin homology domain of IQGAP1[1]
Symbol CH
Pfam PF00307
InterPro IPR001715
SCOP 1aoa
CDD cd00014

Calponin homology domain (or CH domain) is a family of actin binding domains found in both cytoskeletal proteins and signal transduction proteins.[2] The domain is about 100 amino acids in length and is composed of four alpha helices.[3] It comprises the following groups of actin-binding domains:

A comprehensive review of proteins containing this type of actin-binding domains is given in.[4]

The CH domain is involved in actin binding in some members of the family. However in calponins there is evidence that the CH domain is not involved in its actin binding activity.[5] Most proteins have two copies of the CH domain, however some proteins such as calponin and the human vav proto-oncogene (P15498) have only a single copy. The structure of an example CH domain has been determined using X-ray crystallography.[6]


Human genes encoding calponin homology domain-containing proteins include:


  1. ^ PDB 2RR8; Umemoto R, Nishida N, Ogino S, Shimada I (September 2010). "NMR structure of the calponin homology domain of human IQGAP1 and its implications for the actin recognition mode". J. Biomol. NMR 48 (1): 59–64. doi:10.1007/s10858-010-9434-8. PMID 20644981. 
  2. ^ Saraste M, Castresana J (1995). "Does Vav bind to F-actin through a CH domain?". FEBS Lett. 374 (2): 149–151. doi:10.1016/0014-5793(95)01098-Y. PMID 7589522. 
  3. ^ Korenbaum, E.; Rivero, F. (Sep 2002). "Calponin homology domains at a glance.". J Cell Sci 115 (Pt 18): 3543–5. doi:10.1242/jcs.00003. PMID 12186940. 
  4. ^ Hartwig JH (1995). "Actin-binding proteins. 1: Spectrin super family". Protein Prof. 2 (7): 703–800. PMID 7584474. 
  5. ^ Gimona M, Mital R (1998). "The single CH domain of calponin is neither sufficient nor necessary for F-actin binding". J. Cell Sci. 111: 1813–1821. PMID 9625744. 
  6. ^ Saraste M, Carugo KD, Banuelos S (1997). "Crystal structure of a calponin homology domain". Nat. Struct. Biol. 4 (3): 175–179. doi:10.1038/nsb0397-175. PMID 9164454. 

This article incorporates text from the public domain Pfam and InterPro IPR001715