The CYP74B and CYP74D divinyl ether synthases possess a side hydroperoxide lyase and epoxyalcohol synthase activities that are enhanced by the site-directed mutagenesis
作者:Yana Y. Toporkova、Elena O. Smirnova、Tatiana M. Iljina、Lucia S. Mukhtarova、Svetlana S. Gorina、Alexander N. Grechkin
DOI:10.1016/j.phytochem.2020.112512
日期:2020.11
The CYP74 family of cytochromes P450 includes four enzymes of fatty acid hydroperoxide metabolism: allene oxide synthase (AOS), hydroperoxide lyase (HPL), divinyl ether synthase (DES), and epoxyalcohol synthase (EAS). The present work is concerned with catalytic specificities of three recombinant DESs, namely, the 9-DES (LeDES, CYP74D1) of tomato (Solanum lycopersicum), 9-DES (NtDES, CYP74D3) of tobacco
CYP74 细胞色素 P450 家族包括四种脂肪酸氢过氧化物代谢酶:丙二烯氧化合酶 (AOS)、氢过氧化物裂解酶 (HPL)、二乙烯基醚合酶 (DES) 和环氧醇合酶 (EAS)。目前的工作涉及三种重组 DES 的催化特异性,即番茄 (Solanum lycopersicum) 的 9-DES (LeDES, CYP74D1)、烟草 (Nicotiana tabacum) 的 9-DES (NtDES, CYP74D3) 和 13-DES (LuDES, CYP74B16) 亚麻 (Linum usitatissimum),以及它们对定点诱变的改变。LeDES 和 NtDES 都将亚油酸和 α-亚麻酸的 9-氢过氧化物转化为二乙烯基醚 colleneic 和 colnelenic 酸(分别),只有少数 HPL 和 EAS 产物。相比之下,LeDES 和 NtDES 对亚油酸 13-过氧化氢