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 (in the presence of Ca(2+)) with pde-1, madf-3, rpl-7A, tax-6, efk-1, npp-1, obr-4, sos-1, akt-1, unc-13, tag-196, ugt-48, nmy-2, F27D4.4, ddx-23, efa-6 and R11H6.4. This protein has four functional calcium-binding sites. Belongs to the calmodulin family.