Calponin homology domain

Calponin homology actin-binding domain (or CH domain) is a superfamily of actin binding domains found in both cytoskeletal proteins and signal transduction proteins. It comprises the following groups of actin-binding domains:


 * Actinin-type (including spectrin, fimbrin, ABP-280)
 * Calponin-type

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

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. Most proteins have two copies of the CH domain, however some proteins such as calponin and the human vav proto-oncogene have only a single copy. The structure of an example CH-domain has recently been solved.

Examples
Human genes encoding calponin homology domain-containing proteins include:
 * ACTN1, ACTN2, ACTN3, ACTN4, ARHGEF6, ARHGEF7, ASPM,
 * CLMN, CNN1, CNN2, CNN3,
 * DIXDC1, DMD, DST,
 * EHBP1, EHBP1L1,
 * FLNA, FLNB, FLNC,
 * GAS2, GAS2L1, GAS2L2, GAS2L3,
 * IQGAP1, IQGAP2, IQGAP3,
 * LCP1, LIMCH1, LMO7, LRCH1, LRCH2, LRCH3, LRCH4,
 * MACF1, MAPRE1, MAPRE2, MAPRE3, MICAL1, MICAL2, MICAL2PV1, MICAL2PV2, MICAL3, MICALL1, MICALL2,
 * NAV2, NAV3,
 * PARVA, PARVB, PARVG, PLEC1, PLS1, PLS3, PP14183,
 * SMTN, SMTNL2, SPECC1, SPECC1L, SPNB4, SPTB, SPTBN1, SPTBN2, SPTBN4, SPTBN5, SYNE1, SYNE2,
 * TAGLN, TAGLN2, TAGLN3,
 * UTRN, and
 * VAV1, VAV2, VAV3