(E)-ferulate + UDP-alpha-D-glucuronate = (E)-4-O-(beta-D-glucuronosyl)-ferulate + UDP + H(+)
(e)-ferulate + udp-alpha-d-glucuronate = (e)-4-o-(beta-d-glucuronosyl)-ferulate + udp + h(+)
(E)-ferulate + UDP-alpha-D-glucuronate = (E)-4-O-(beta-D-glucuronosyl)-ferulate + UDP + H(+)
(e)-ferulate + udp-alpha-d-glucuronate = (e)-4-o-(beta-d-glucuronosyl)-ferulate + udp + h(+)