C2CD6 is an auxiliary component of the CatSper complex, a channel complex involved in sperm cell hyperactivation. Hyperactivation is needed for sperm motility, which is essential late in the preparation of sperm for fertilisation. Within this system C2CD6 has a targeting role: it is required for CatSper complex targeting and trafficking into the quadrilinear nanodomains of the flagellum.

According to UniProt, C2CD6 targets preassembled CatSper complexes to elongating flagella, where it links the channel-carrying vesicles and motor proteins. The protein is annotated as localised to the flagellum membrane, a cell projection of the sperm cell. The C2CD6 protein contains a calcium-dependent membrane targeting C2 domain, a domain often found in proteins involved in membrane trafficking and signal transduction. HGNC places the gene in the C2 domain containing group and the CatSpermasome complex group.

The official gene symbol is CATSPERT (catsper channel auxiliary subunit tau), and the C2CD6 gene has also been listed as ALS2CR11 and FLJ25351. Earlier names, such as amyotrophic lateral sclerosis 2 chromosome region candidate 11, reflect the fact that an autosomal recessive form of juvenile amyotrophic lateral sclerosis was originally mapped to a region of chromosome 2 that includes this gene. The mouse ortholog is called Catspert.