Potentially involved in docking of synaptic vesicles at presynaptic active zones. May mediate Ca(2+)-regulation of exocytosis acrosomal reaction in sperm (By similarity).
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Cellular Localization:
[Isoform 1]: Membrane ; Single-pass type IV membrane protein .; [Isoform 2]: Nucleus . Cytoplasm, cytoskeleton, microtubule organizing center, centrosome . Cytoplasm, cytoskeleton, spindle . Colocalizes with Lamin A/C and NuMA in interphasic nuclei, and with NuMA and gamma-tubulin in the pericentrosomal region of the mitotic spindle in dividing cells.