Microtubule-dependent motor protein involved in the control of the oriented deposition of cellulose microfibrils (PubMed:12468730). Its motor activity is directed toward the microtubule's plus end. It possesses at least twice the processivity of conventional kinesin and has the potential to drive long-distance transport of cargo along cortical microtubules (PubMed:21914648). {ECO:0000269|PubMed:12468730; ECO:0000269|PubMed:21914648}.