Kinesin-like motor protein involved in the control of the oriented deposition of cellulose microfibrils. Homodimer. Composed of an N-terminal domain which is responsible for the motor activity of kinesin (it hydrolyzes ATP and binds microtubule) and a central to C-terminal alpha-helical coiled coil domain that mediates the heavy chain dimerization. No visible phenotype. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Kinesin family. KIN-4 subfamily.