Cation channel sperm-associated protein subunit delta (Catsperd)

Auxiliary component of the CatSper complex, a complex involved in sperm cell hyperactivation. Sperm cell hyperactivation is necessary for sperm motility which is essential late in the preparation of sperm for fertilization.

Required for CATSPER1 stability before intraflagellar transport and/or incorporation of the CatSper complex channel to the flagellar membrane. .