Microtubule-associated force-producing protein that is targeted to the growing edges of the cell plate during cytokinesis. Also plays a major role in plasma membrane maintenance during pollen maturation (PubMed:18344418). Has a GTPase activity (By similarity). GTP + H2O = GDP + H(+) + phosphate Forms homodimer and may homooligomerize and heterooligomerize to form the phragmoplastin complex (PubMed:14750520). Binds to PHIP1 (PubMed:18621982). Microtubule-associated and localized in the forming cell plate during cytokinesis (PubMed:14750520). Forms dynamic foci in the cell cortex, which colocalize with part of the clathrin endocytic machinery (PubMed:18344418). Ubiquitous. Belongs to the TRAFAC class dynamin-like GTPase superfamily. Dynamin/Fzo/YdjA family. Truncated N-terminus.