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 rng2. In the growing tips and spindle pole body during interphase and in the septum during septation. Component of a ring structure that forms prior to septation. This protein has four functional calcium-binding sites. Belongs to the calmodulin family.