Enables calcium-dependent protein binding activity. Involved in neuron development and synapse organization. Located in several cellular components, including dendrite; presynaptic active zone; and synaptic vesicle. Is anchored component of synaptic vesicle membrane. Is extrinsic component of synaptic vesicle membrane. Human ortholog(s) of this gene implicated in X-linked epilepsy with variable learning disabilities and behavior disorders and non-syndromic X-linked intellectual disability 50. Orthologous to human SYN1 (synapsin I). [provided by Alliance of Genome Resources, Apr 2022]