a cysteine string protein that inhibits N-type calcium channels which is blocked by huntingtin mutants. May have an important role in presynaptic function. May be involved in calcium-dependent neurotransmitter release at nerve endings. Modulates the maturation of cystic fibrosis transmembrane conductance regulator. Two splice-variant isoforms have been described. Note: This description may include information from UniProtKB.
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.