Enzymic synthesis of steroid sulfates XVI. Specificity and regulation of human adrenal hydroxysteroid sulfotransferase
作者:J.B. Adams、D. McDonald
DOI:10.1016/0039-128x(83)90023-5
日期:1983.5
Michaelis-Menten type. By means of enzyme antibody and enzyme stability studies evidence was provided that one and the same enzyme was responsible for sulfurylation of hydroxyls on the 3- and 17- positions of steroids and simple alcohols. The data lend support to previous evidence that the enzyme controls the secretion of dehydroepiandrosterone sulfate via steroid-specific binding sites, enabling self-regulation
人肾上腺的纯羟类固醇磺基转移酶(EC 2.8.2.2)对类固醇具有广泛的底物特异性。现已发现这种广泛的特异性延伸到简单的醇类。从C3开始的普通脂肪族醇作为底物,C9的分解率最高。速率增加伴随着Km的减少。与类固醇(如脱氢表雄酮)的硫化基团形成波状动力学形成鲜明对比,简单醇类的动力学属于正常的Michaelis-Menten类型。通过酶抗体和酶稳定性研究,提供了一种和相同的酶负责类固醇和简单醇的3位和17位羟基羟基的磺化作用的证据。