Enables several functions, including calmodulin binding activity; disordered domain specific binding activity; and small GTPase binding activity. Involved in several processes, including cellular response to insulin stimulus; establishment of endoplasmic reticulum localization to postsynapse; and regulation of postsynaptic cytosolic calcium ion concentration. Acts upstream of or within several processes, including melanosome transport; regulation of inositol 1,4,5-trisphosphate-sensitive calcium-release channel activity; and secretion by cell. Located in several cellular components, including cytoplasmic vesicle; cytoskeleton; and photoreceptor outer segment. Part of unconventional myosin complex. Is active in glutamatergic synapse and postsynapse. Is expressed in nervous system and retina. Used to study Griscelli syndrome type 1. Human ortholog(s) of this gene implicated in Griscelli syndrome type 1. Orthologous to human MYO5A (myosin VA). [provided by Alliance of Genome Resources, Apr 2022]