Lecithin:Cholesterol Acyltransferase Activation by Sulfhydryl-Reactive Small Molecules: Role of Cysteine-31
作者:Lita A. Freeman、Stephen J. Demosky、Monika Konaklieva、Rostislav Kuskovsky、Angel Aponte、Alice F. Ossoli、Scott M. Gordon、Ross F. Koby、Kelly A. Manthei、Min Shen、Boris L. Vaisman、Robert D. Shamburek、Ajit Jadhav、Laura Calabresi、Marjan Gucek、John J.G. Tesmer、Rodney L. Levine、Alan T. Remaley
DOI:10.1124/jpet.117.240457
日期:2017.8
plasma and with recombinant LCAT. Mass spectrometry and nuclear magnetic resonance were used to determine compound A adduct formation with LCAT. Molecular modeling was performed to gain insight into the effects of compound A on LCAT structure and activity. Compound A increased LCAT activity in a subset (three of nine) of LCAT mutations to levels comparable to FLD heterozygotes. The site-directed mutation
卵磷脂:胆固醇酰基转移酶(LCAT)催化血浆胆固醇酯形成,并且在家族性卵磷脂:胆固醇酰基转移酶缺乏症(FLD)中存在缺陷,后者是一种以低密度高脂蛋白,贫血和肾脏疾病为特征的常染色体隐性疾病。这项研究旨在研究化合物A [3-(5-(乙硫基)-1,3,4-噻二唑-2-基硫基]吡嗪-2-腈](一种小的杂环胺)激活LCAT的机理。在人血浆和重组LCAT中测试了化合物A对LCAT的作用。质谱和核磁共振被用于确定与LCAT形成的化合物A加合物。进行分子建模以深入了解化合物A对LCAT结构和活性的影响。化合物A在LCAT突变子集中(三分之三)将LCAT活性提高到与FLD杂合子相当的水平。定点突变LCAT-Cys31Gly阻止了化合物A的激活。用带电残基(Glu,Arg和Lys)取代Cys31降低了LCAT活性,而庞大的疏水基团(Trp,Leu,Phe和Met)则提高了活性。 3倍(P <0.005)。用