Kinesin is a microtubule-associated force-producing protein that may play a role in organelle transport. Plays a role during spermiogenesis in the development of the sperm tail midpiece and in the normal function of spermatozoa (By similarity). May play a role in the formation of the mitochondrial sheath formation in the developing spermatid midpiece (By similarity). Oligomer composed of two heavy chains and two light chains. Associates with microtubulin in an ATP-dependent manner (PubMed:11319135). Interacts with KIF5C (PubMed:11319135). Interacts with ODF1 (PubMed:12594206). Interacts with LRGUK (By similarity). Interacts with VDAC2 (By similarity). In elongating spermatid tail midpiece, localized in outer dense fibers (ODFs) and associates with mitochondria (PubMed:12594206, PubMed:15464570). Also localizes to the manchette in elongating spermatids (By similarity). Expressed in postmeiotic male germ cells (at protein level). The heptad repeat (HR) motif is sufficient for interaction with kinesin heavy (KHL) chains and ODF1. The TPR region is involved in mitochondrial binding. Belongs to the kinesin light chain family.