Stereochemistry of Δ<sup>4</sup>dehydrogenation catalyzed by an ivy (Hedera helix) Δ<sup>9</sup>desaturase homolog
作者:Amy E. Tremblay、Edward Whittle、Peter H. Buist、John Shanklin
DOI:10.1039/b617942h
日期:——
The stereochemistry of palmitoyl-ACP Delta(4) desaturase-mediated dehydrogenation has been examined by tracking the fate of deuterium atoms located on stereospecifically monodeuterated substrates-(4S)- and (4R)-[4-(2)H(1)]-palmitoyl-ACP and (5S)- and (5R)-[5-(2)H(1)]-palmitoyl-ACP. It was found that the introduction of the (Z)-double bond between C-4 and C-5 of a palmitoyl substrate occurs with pro-R
棕榈酰-ACP Delta(4)脱氢酶介导的脱氢的立体化学已通过追踪位于立体特异性单氘化底物-(4S)-和(4R)-[4-(2)H(1)]上的氘原子的命运进行了检查。 -棕榈酰-ACP和(5S)-和(5R)-[5-(2)H(1)]-棕榈酰-ACP。发现在棕榈酰基底物的C-4和C-5之间引入(Z)-双键与pro-R对映选择性一起发生,该结果与密切相关的同源-castor硬脂酰-ACP Delta获得的结果相匹配。 (9)去饱和酶。这些数据表明,尽管两种酶之间的区域选择性不同,但氢去除的立体化学仍得以保留。