5-Hydroxyferulic acid 是一种羟基肉桂酸，是苯丙烷途径的代谢产物。5-Hydroxyferulic acid 是芥子酸生物合成中的前体，也是 COMT 非酯化底物。
5-Hydroxyferulic acid is a hydroxycinnamic acid and is a metabolite of the phenylpropanoid pathway. 5-Hydroxyferulic acid is a precursor in the biosynthesis of sinapic acid and is also a COMT non-esterifed substrate[1][2][3].
The product of the alfalfa Caffeic acid/5-hydroxyferulic acid 3/5-O-methyltransferase (COMT) catalyzed methylation of 5-Hydroxyferulic acid is sinapic acid. 5-Hydroxyferulic acid O-methyltransferase activities (pkat mg-1 protein) in stem material from COMT downregulates transgenic alfalfa[1].
[1]. K Parvathi, et al. Substrate Preferences of O-methyltransferases in Alfalfa Suggest New Pathways for 3-O-methylation of Monolignols. Plant J. 2001 Jan;25(2):193-202.
[2]. S Maury, et al. Tobacco O-methyltransferases Involved in Phenylpropanoid Metabolism. The Different Caffeoyl-Coenzyme A/5-hydroxyferuloyl-coenzyme A 3/5-O-methyltransferase and Caffeic acid/5-hydroxyferulic Acid 3/5-O-methyltransferase Classes Have Distinct Substrate Specificities and Expression Patterns. Plant Physiol. 1999 Sep;121(1):215-24.
[3]. Inoue, et al. Substrate Preferences of Caffeic acid/5-hydroxyferulic Acid 3/5-O-methyltransferases in Developing Stems of Alfalfa (Medicago Sativa L.). Arch Biochem Biophys. 2000 Mar 1;375(1):175-82.
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