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 cmbB, numA/nucleomorphin, pgkA/phosphoglycerate kinase, and thyB/thymidine kinase in the presence of Ca(2+). Interacts with dwwA in the absence of Ca(2+). Expressed during development. Expression levels decrease steadily from the initiation of development until late culmination. The N-terminus is blocked. Trimethylation of Lys-118 observed in other calmodulins is absent here. This protein has four functional calcium-binding sites. Loss-of-function mutant (antisense inhibition) fail to complete the final step of cytokinesis and form multinucleated cells. Belongs to the calmodulin family.