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.
This protein is a binding protein with three distinct domains: Calponin Homology (CH), regulatory domain (RD), and Click-23 domain containing calponin repeats.  The CH domain interacts with α-actin and filamin, while the RD domain binds to actin.