Functions as part of axonemal radial spoke complexes that play an important part in the motility of sperm and cilia. Does not seem to have NDK kinase activity. Confers protection from cell death by Bax and alters the cellular levels of several antioxidant enzymes including Gpx5. May play a role in spermiogenesis by increasing the ability of late-stage spermatids to eliminate reactive oxygen species (By similarity).
Subcellular locations: Cell projection, Cilium, Cytoplasm, Cytoskeleton, Flagellum axoneme
Specifically expressed in testis germinal cells.