Occurrence of glucuronokinase in various plant tissues and comparison of enzyme activity of seedlings and green plants

Glucuronokinase (EC 2.7.1.43) activity was detected in etiolated seedlings of corn, mung bean and soybean. Biosynthesis of glucuronokinase is not limited to seedlings, because expanding green leaves of corn produced almost as much glucuronokinase activity as etiolated seedlings when data were expressed on the basis of soluble protein. The enzyme was also present in extracts of tobacco callus and Lilium longiflorum pollen, with more enzyme activity obtained from pollen than any other source. Detection of glucuronokinase in green leaves of of mung bean was precluded by the presence of an enzyme inhibitor.