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 (By similarity). Involved in the regulation of flagellar motility (By similarity). Essential for male fertility, sperm head morphogenesis and sperm flagellum formation (By similarity). Component of the nexin-dynein regulatory complex (N-DRC). Interacts with TCTE1/DRC5 (By similarity). Interacts with DRC3 and GAS8/DRC4 (By similarity). Associated with the outer doublet microtubules (OD). Expressed in the testis. Belongs to the DRC7 family.