The function of ENSG00000147081 (AKAP4, A-kinase anchoring protein 4) is as follows. Major structural component of sperm fibrous sheath (PubMed:9822690). Plays a role in sperm motility (PubMed:34415320, PubMed:9822690). {ECO:0000269|PubMed:34415320, ECO:0000269|PubMed:9822690}.