The CH domain is found in both cytoskeletal proteins and signal transduction proteins [1]. 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 [4]. Most member proteins have from two to four copies of the CH domain, however some proteins such as calponin and Swiss:P15498 have only a single copy.

1: Does Vav bind to F-actin through a CH domain? Castresana J, Saraste M; FEBS Lett 1995;374:149-151. PMID:7589522

2: Crystal structure of a calponin homology domain. Carugo KD, Banuelos S, Saraste M; Nat Struct Biol 1997;4:175-179. PMID:9164454

3: CH domains revisited. Stradal T, Kranewitter W, Winder SJ, Gimona M; FEBS Lett 1998;431:134-137. PMID:9708889

4: The single CH domain of calponin is neither sufficient nor necessary for F-actin binding. Gimona M, Mital R; J Cell Sci 1998;111:1813-1821. PMID:9625744