Amaranthin in feather cockscombs is synthesized via glucuronylation at the cyclo-DOPA glucoside step in the betacyanin biosynthetic pathway
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Uridine 5′-diphosphate (UDP)-glucuronic acid: cyclo-DOPA 5-glucoside glucuronosyltransferase activity was detected in a crude extract prepared from the purple flowers of feather cockscombs. This suggests that the glucuronic acid moiety of amaranthin and its derivatives may be introduced at the cyclo-DOPA glucoside step, but not at the betanidin glucoside step.
KeywordsAmaranthin Betacyanin cyclo-DOPA glucoside Feather cockscombs Glucuronosyltransferase
This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (15657008) and by the National Institute of Floricultural Science (NIFS), the National Agricultural Research Organization (NARO), and the Japan Food Chemical Research Foundation.
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