Monogalactosyl diacylglycerol is a substrate for lipoxygenase: its implications for oxylipin formation directly from lipids

Journal of Plant Interactions

Anna Nakashima¹ 

关键词: Glycine max;    lipoxygenase;    oxylipin;    monogalactosyldiacylglycerol;    LC-MS/MS analysis;   

DOI  :  10.1080/17429145.2010.544767

学科分类：生物科学（综合）

来源: Taylor & Francis

【 摘 要 】

Abstract Oxylipins are formed from fatty acids in plants in response to various stresses, and exert their roles as signal molecules or direct defense molecules. Oxylipins are usually found in free forms; however, oxylipins esterified in galactolipids have been identified recently, which implicates an alternative biosynthetic pathway to form oxylipins without a lipid-hydrolyzing step. In order to get insight into the alternative pathway, we examined catalytic nature of soybean seed lipoxygenase-1 on galactolipids. The lipoxygenase showed no activity on the galactolipids; however, significant activity was observed when deoxycholic acid was added into the reaction mixture. HPLC-mass spectrometry analyses showed that either or both the acyl moieties were oxygenated by the lipoxygenase in regio specific manner. Accordingly, we concluded that galactolipids could serve as substrates for lipoxygenases, from which direct oxygenation of galactolipids in an oxylipin metabolism under stress condition in plants was pr...

【 授权许可】

Unknown