Probable plus end-directed motor protein that functions in the NACK-PQR (NPK1-NQK1/MEK1-NRK1) MAP kinase signaling pathway; which is essential for somatic cell cytokinesis; especially for the cell-plate formation and its expansion. Regulates the activity and the localization of NPK1 by association through the non-catalytic region of the kinase. {ECO:0000269|PubMed:11955449; ECO:0000269|PubMed:22006334}.