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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Umbellic acid ： ウィキペディア英語版 Umbellic acid Umbellic acid (2,4-dihydroxycinnamic acid) is a hydroxycinnamic acid. It is an isomer of caffeic acid. It is a precursor in the umbelliferone biosynthesis pathway. Umbelliferone is a phenylpropanoid and as such is synthesized from L-phenylalanine, which in turn is produced via the shikimate pathway. Phenylalanine is lysated into cinnamic acid, followed by hydroxylation by cinnamate 4-hydroxylase to yield 4-coumaric acid. The 4-coumaric acid is again hydroxylated by cinnamate/coumarate 2-hydroxylase to yield 2,4-dihydroxy-cinnamic acid followed by a bond rotation of the unsaturated bond adjacent to the carboxylic acid group. Finally an intramolecular attack from the hydroxyl group of C2' to the carboxylic acid group closes the ring and forms the lactone umbelliferone. :  $\backslash xrightarrow$  $\backslash xrightarrow$  $\backslash xrightarrow$  $\backslash longrightarrow$  The enzyme 4-hydroxycinnamate decarboxylase, induced in bacteria species such as ''Klebsiella oxytoca'', works also with p-coumaric acid analogs such as E-2,4-dihydroxycinnamic acid. == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Umbellic acid」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.