UDP-alpha-D-galacturonate + H(+) => UDP-beta-L-arabinopyranose + CO2
udp-alpha-d-galacturonate + h(+) => udp-beta-l-arabinopyranose + co2
UDP-alpha-D-galacturonate + H(+) => UDP-beta-L-arabinopyranose + CO2
udp-alpha-d-galacturonate + h(+) => udp-beta-l-arabinopyranose + co2