Amaranthin in feather cockscombs is synthesized via glucuronylation at the cyclo-DOPA glucoside step in the betacyanin biosynthetic pathway

J Plant Res. 2005 Dec;118(6):439-42. doi: 10.1007/s10265-005-0237-z. Epub 2005 Oct 25.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Betacyanins / metabolism*
  • Celosia / enzymology
  • Celosia / metabolism*
  • Dihydroxyphenylalanine / metabolism*
  • Glucosides / metabolism
  • Glucuronic Acid / metabolism*
  • Glucuronosyltransferase / isolation & purification
  • Glucuronosyltransferase / metabolism*


  • Betacyanins
  • Glucosides
  • cyclo-dopa
  • amaranthin betacyanin
  • Dihydroxyphenylalanine
  • Glucuronic Acid
  • Glucuronosyltransferase