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Research article - Peer-reviewed, 2013

Coordination of auxin and ethylene biosynthesis by the aminotransferase VAS1

Zheng, Zuyu; Guo, Yongxia; Novak, Ondrej; Dai, Xinhua; Ljung, Karin; Noel, Joseph P.; Chory, Joanne


We identify an Arabidopsis pyridoxal-phosphate-dependent aminotransferase, VAS1, whose loss-of-function simultaneously increases amounts of the phytohormone auxin and the ethylene precursor 1-aminocyclopropane-1-carboxylate. VAS1 uses the ethylene biosynthetic intermediate methionine as an amino donor and the auxin biosynthetic intermediate indole-3-pyruvic acid as an amino acceptor to produce L-tryptophan and 2-oxo-4-methylthiobutyric acid. Our data indicate that VAS1 serves key roles in coordinating the amounts of these two vital hormones.

Published in

Nature Chemical Biology
2013, Volume: 9, number: 4, pages: 244-246