Calmodulin mediates the control of a large number of enzymes, ion channels and other proteins by Ca(2+). Among the enzymes to be stimulated by the calmodulin-Ca(2+) complex are a number of protein kinases and phosphatases. Interacts with KCBP and CIP111 (PubMed:10531384, PubMed:11346951). Binds to IQD1 and IQD20 (PubMed:23204523). Recruited by IQD1 to microtubules. A number of isoforms are produced. According to EST sequences. This protein has four functional calcium-binding sites. Belongs to the calmodulin family.