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 (PubMed:23427265, PubMed:25411337). Required for normal flagellar waveform (PubMed:26063732). Component of the nexin-dynein regulatory complex (N-DRC), composed of at least DRC1, DRC2, DRC3, DRC4, DRC5, DRC6, DRC7, DRC8, DRC9, DRC10 and DRC11 (PubMed:25411337, PubMed:23427265). Found in a complex with DRC3, DRC4, DRC7 and DRC11 (PubMed:26063732). Defects in DRC3 give the dc3 phenotype characterized by reduced swimming speed, increased flagellar beat frequency and abnormal flagellar waveform. Belongs to the DRC3 family.