Motor for anterograde transport of mitochondria. Has a microtubule plus end-directed motility (By similarity). Mediates the transport of synaptic vesicles in neuronal cells. Involved in the translocation of lysosomes from perinuclear regions to the cell periphery. Monomer (By similarity). Interacts with KIFBP (By similarity). Interacts (via C-terminus end of the kinesin-motor domain) with CHP1; the interaction occurs in a calcium-dependent manner (PubMed:12204119). Interacts with MADD (via death domain) (By similarity). Isoform 1 is expressed in the brain with lower expression in testis and liver (at protein level). Isoform 1 is strongly expressed in the brain and ovary, with lower expression in lung, kidney, uterus, testis and liver. Isoform 2 is expressed in non-neuronal cells. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Kinesin family. Unc-104 subfamily.