Characterization of 3-[(Carboxymethyl)thio]picolinic Acid: A Novel Inhibitor of Phosphoenolpyruvate Carboxykinase
作者:Matthew J. Mcleod、Anthony P. Krismanich、Abdeljalil Assoud、Gary I. Dmitrienko、Todd Holyoak
DOI:10.1021/acs.biochem.9b00583
日期:2019.9.17
initial chemical scaffold to create a potentially more selective inhibitor, 3-[(carboxymethyl)thio]picolinic acid (CMP), which has been characterized both structurally and kinetically here. These data demonstrate that CMP acts as a competitive inhibitor at the OAA/PEP binding site, with its picolinic acid moiety coordinating directly with the M1 metal in the active site (Ki ∼ 29–55 μM). The extended
磷酸烯醇丙酮酸羧激酶(PEPCK)传统上已被表征为在糖异生的第一步中起作用。对PEPCK的代谢作用的当前理解最近已扩展到包括它作为三羧酸循环通量的一般介体。PEPCK的选择性抑制体内和体外已实现与3- mercaptopicolinic酸(MPA)(ķ我〜8μM),其抑制机制直到最近才被阐明。根据各种PEPCK抑制剂的结晶学和机理数据,将MPA用作最初的化学支架,以创建可能更具选择性的抑制剂3-[(羧甲基)硫代]吡啶甲酸(CMP),该结构在结构上都得到了表征在动力学上。这些数据表明,CMP充当在OAA / PEP结合位点的竞争性抑制剂,与它的皮考啉酸部分与在活性位点的M1金属直接协调(ķ我〜29-55μM)。延长的羧基尾部占据了第二个结合裂口,先前显示可能被磺基乙酸酯占据(K i约82μM),并首次证明了单个分子结构同时占据了两个OAA / PEP亚位点。通过同时占据两个OAA / PEP