Chemical mechanism of inactivation of bee venom phospholipase A2 by the marine natural products manoalide, luffariellolide, and scalaradial
作者:Barbara C. M. Potts、D. John Faulkner、Marianne S. De Carvalho、Robert S. Jacobs
DOI:10.1021/ja00039a021
日期:1992.6
Manoalide methyl analogue (MMA, 12), which is a simple analogue of the reactive portion of 1, reacted similarly. The γ-(n-butyl-amino)butenolide 6b reacted with hydroxylamine to form the oxime 8 with concomitant release of n-butylamine. When the luffariellolide-PLA 2 and manoalide-PLA 2 adducts were treated with hydroxylamine, the PLA 2 activity was substantially recovered, but the activity was not recovered
manoalide (1) 和 luffariellolide (2) 对蜂毒磷脂酶 A 2 (PLA 2 ) 的抑制涉及在 PLA 2 上的赖氨酸残基和每种药物上的醛基之间最初形成希夫碱(亚胺)。通过 1 H NMR 光谱研究使用伯胺代替赖氨酸残基的模型反应。胺在 2 的 γ-羟基丁烯内酯环上反应生成 γ-(烷基氨基)丁烯内酯 6a、b,它们是相应席夫碱的环化形式。Manoalide 甲基类似物 (MMA, 12) 是 1 反应部分的简单类似物,反应类似。γ-(正丁基-氨基)丁烯内酯6b与羟胺反应形成肟8,同时释放正丁胺。当丝瓜内酯-PLA 2 和马诺内酯-PLA 2 加合物用羟胺处理时,