Probable plus end-directed motor protein that functions in a MAP kinase signaling pathway (ANP1-MKK6-MPK4); which is essential for somatic cell cytokinesis; especially for the cell- plate formation and its expansion. Regulates the activity and the localization of ANP1; probably by association through the non- catalytic region of the kinase. Functionally redundant with NACK2 and essential to promote the progression of cytokinesis and for cellularization (formation of the cell plate) during microgametogenesis and megagametogenesis. {ECO:0000269|PubMed:11818068; ECO:0000269|PubMed:11955449; ECO:0000269|PubMed:15569152; ECO:0000269|PubMed:19825582; ECO:0000269|PubMed:20802223; ECO:0000269|PubMed:22006334}.