Component of the nexin-dynein regulatory complex (N-DRC) a key regulator of ciliary/flagellar motility which maintains the alignment and integrity of the distal axoneme and regulates microtubule sliding in motile axonemes. May play a role in the assembly of N-DRC. May be required for sperm motility. Component of the nexin-dynein regulatory complex (N-DRC). Interacts with FBXL13/DRC6, DRC3 and DRC7. Detected along the length of the sperm flagellum. Belongs to the DRC5 family.