Molecular basis for covalent inhibition of glyceraldehyde-3-phosphate dehydrogenase by a 2-phenoxy-1,4-naphthoquinone small molecule
作者:Stefano Bruno、Elisa Uliassi、Mirko Zaffagnini、Federica Prati、Christian Bergamini、Riccardo Amorati、Gianluca Paredi、Marilena Margiotta、Paola Conti、Maria Paola Costi、Marcel Kaiser、Andrea Cavalli、Romana Fato、Maria Laura Bolognesi
DOI:10.1111/cbdd.12941
日期:2017.8
Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) has recently gained attention as an anti-protozoan and anti-cancer drug target. We have previously identified 2-phenoxy-1,4-naphthoquinone as an inhibitor of both Trypanosoma brucei and human GAPDH. Herein, through multiple chemical, biochemical, and biological studies, and through the design of analogs, we confirmed the formation of a covalent adduct
3-磷酸甘油醛脱氢酶(GAPDH)作为抗原生动物和抗癌药物的靶标最近受到关注。我们以前已经确定2-苯氧基-1,4-萘醌是布鲁氏锥虫和人GAPDH的抑制剂。在这里,通过多种化学,生物化学和生物学研究,以及通过类似物的设计,我们证实了共价加合物的形成,我们阐明了其抑制机制,并在细胞培养中证明了抗锥虫,抗血浆和细胞毒性的活性。总体结果为以下假设提供了依据:2-苯氧基-1,4-萘醌通过酚盐置换机制共价结合GAPDH催化半胱氨酸。通过研究2-苯氧基-1,4-萘醌及其类似物与4种GAPDH同源物的反应性,我们表明,在共价抑制之前没有形成强的非共价复合物。但是,同源物之间的失活率差异高达5倍,提示其活性位点的结构或静电差异可用于进一步设计动力学选择性抑制剂。此外,我们初步表明,2-苯氧基-1,4-萘醌对GAPDHs的选择性优于其他两个半胱氨酸依赖性酶,支持其作为设计新型抑制剂的弹头起始片段的适用性。