Has an essential role in the formation of sperm flagella and flagellar structure maintainance. It acts as a suppressor of ubiquitination and degradation of proteins involved in flagellar development and motility. Interacts with AKAP3, ODF2 and TSSK4. Localization varies during spermatozoa development. The protein is distributed in the nuclear membrane of the spermatogonia, in the nucleus of round spermatids, in the nucleus and cytoplasm of early elongating spermatids, in the cytoplasm of late elongating spermatids, and in the flagella of epididymal spermatozoa. Expressed in the sperm. The disease is caused by variants affecting the gene represented in this entry.