Probable calcium-dependent phospholipid-binding protein that may play a role in calcium-mediated intracellular processes. Interacts (via VWFA domain) with ACTB, BCOR, BICD2, CCDC22, CDC42BPB, CEP162, MYCBP2, NONO, PDCD6, PITPNM2, RDX, SKIL, SKT, SPTBN1, UBE2O and WTAP (PubMed:12522145). Widely expressed (PubMed:12670487, PubMed:12949241). Expressed strongly in the brain, heart and prostate (PubMed:12670487, PubMed:12949241). Expressed strongly in peripheral blood leukocytes (PubMed:12949241). Belongs to the copine family.