Design, synthesis, and in vitro evaluation of a fluorescently labeled irreversible inhibitor of the catalytic subunit of cAMP-dependent protein kinase (PKACα)
作者:Robert A. Coover、Nicole M. Luzi、Sudha Korwar、Maria E. Casile、Charles E. Lyons、Darrell L. Peterson、Keith C. Ellis
DOI:10.1039/c6ob00529b
日期:——
we report a complementary approach to developing irreversible kinase inhibitors that utilizes the substrate-binding site. Using the catalytic subunit of cAMP-dependent protein kinase (PKACα) as a model system, we have designed and synthesized an irreversible inhibitor based on the substrate-competitive inhibitor scaffold PKI(14-22) that covalently modifies non-catalytic Cys199 in the PKACα substrate-binding
不可逆激酶抑制剂的设计和开发是激酶药物发现的一个扩展领域。开发这些抑制剂的当前方法是利用ATP竞争性抑制剂支架在激酶ATP结合位点靶向非催化性半胱氨酸。但是,该方法受到限制,因为并非所有激酶在可被靶向的ATP结合位点均具有半胱氨酸。在这项工作中,我们报告了开发利用底物结合位点的不可逆激酶抑制剂的补充方法。使用cAMP依赖性蛋白激酶(PKACα)的催化亚基作为模型系统,我们基于底物竞争性抑制剂支架PKI(14-22)设计并合成了一种不可逆抑制剂,该抑制剂共价修饰PKACα中的非催化Cys199。底物结合位点。新化合物抑制PKACα(IC50 = 11.8±1.1 nM),是激酶面板中PKACα的约100倍选择性,并通过荧光,质谱和动力学实验证明了该激酶的共价标记。这项研究证明了利用这种新方法开发不可逆抑制剂的可行性,这些抑制剂在其底物结合位点具有相似的非催化半胱氨酸的任何89个激酶。