Probable plus end-directed motor protein that functions in a MAP kinase signaling pathway (ANP3-MKK6-MPK4); which is essential for somatic cell cytokinesis; especially for the cell- plate formation and its expansion. May regulates the activity and the localization of ANP3; probably by association through the non- catalytic region of the kinase. Functionally redundant with NACK1 and essential to promote the progression of cytokinesis and for cellularization (formation of the cell plate) during microgametogenesis and megagametogenesis. {ECO:0000269|PubMed:12694597; ECO:0000269|PubMed:15569152; ECO:0000269|PubMed:19825582; ECO:0000269|PubMed:20802223; ECO:0000269|PubMed:21575092; ECO:0000269|PubMed:9217006; ECO:0000269|PubMed:9224679}.