Possesses low catalytic activity on indole-3-acetic acid (IAA) in vitro. May transfer UDP-glucose from sucrose synthase to callose synthase for the synthesis of callose at the forming cell plate during cytokinesis. Has high affinity for 4-aminobenzoate. Catalyzes the formation of 4-aminobenzoate glucose ester which represents a storage form of 4-aminobenzoate in the vacuole. Is the major source of this activity in the plant. Also active in vitro on benzoates and benzoate derivatives. (indol-3-yl)acetate + UDP-alpha-D-glucose = 1-O-(indol-3-ylacetyl)-beta-D-glucose + UDP Plant hormone metabolism; auxin conjugation. Interacts with CALS1, ROP1 and phragmoplastin. During interphase, distributed in a punctate pattern in the perinuclear region. Localized in the forming cell plate during cytokinesis. No visible phenotype under normal growth condition, but strong reduction in 4-aminobenzoate glucosyltransferase activity. Belongs to the UDP-glycosyltransferase family.