Deuterium incorporation experiments from (3<i>R</i>)- and (3<i>S</i>)-[3-2H]leucine into characteristic isoprenoidal lipid-core of halophilic archaea suggests the involvement of isovaleryl-CoA dehydrogenase
作者:Noriaki Yamauchi、Ryo Tanoue
DOI:10.1080/09168451.2017.1373588
日期:2017.11.2
incubation experiments with whole cell Halobacterium salinarum. Deuterium-labeled (3R)- and (3S)-[3-2H]leucine were freshly prepared as substrates from 2,3-epoxy-4-methyl-1-pentanol. Incorporation of deuterium from (3S)-[3-2H]leucine and loss of deuterium from (3R)-[3-2H]leucine in the lipid-core of H. salinarum was observed. Taken together with the results of our previous report, involving the incubation
使用全细胞盐杆菌的孵育实验,观察到了亮氨酸的两个C-3氢在嗜盐古细菌中产生特征性类异戊二烯脂质的立体化学反应过程。氘标记的(3R)-和(3S)-[3-2H]亮氨酸是由2,3-环氧-4-甲基-1-戊醇作为底物新鲜制备的。观察到来自(3S)-[3-2H]亮氨酸的氘掺入和来自盐芥中脂质核心的来自(3R)-[3-2H]亮氨酸的氘损失。连同我们先前报告的结果,涉及手性标记的[5-2H]亮氨酸的孵育,这些结果强烈表明,异戊酰辅酶A脱氢酶参与了嗜盐古细菌中亮氨酸向类异戊二烯脂质的转化。反应的立体化学过程(抗消除)可能与以前报道的哺乳动物酶反应的过程相同。因此,这些结果表明支链氨基酸以与其他生物类似的方式被代谢成古细菌中的甲羟戊酸。