作者:Ayako Tsuchiya、Miwako Asanuma、Go Hirai、Kana Oonuma、Muhammad Muddassar、Eri Nishizawa、Yusuke Koyama、Yuko Otani、Kam Y. J. Zhang、Mikiko Sodeoka
DOI:10.1039/c3mb00003f
日期:——
RE derivatives, which are cell-permeable and non-electrophilic dual-specificity protein phosphatase inhibitors developed in our laboratory, inhibit CDC25A/B non-competitively, as determined by means of kinetic experiments. To identify the binding site of RE derivatives, we designed and synthesized the new probe molecule RE142, having a Michael acceptor functionality for covalent bond formation with the enzyme, a biotin tag to enable enrichment of probe-bound peptide(s), and a chemically cleavable linker to facilitate release of probe-bound peptides from avidin beads. LC-MS analysis indicated that RE142 binds to one of the residues Cys384-Tyr386 of CDC25A, within a pocket adjacent to the catalytic site.
RE 衍生物是我们实验室开发的具有细胞渗透性和非亲电性的双特异性蛋白磷酸酶抑制剂,通过动力学实验确定,它们对 CDC25A/B 具有非竞争性抑制作用。为了确定 RE 衍生物的结合位点,我们设计并合成了新的探针分子 RE142,该分子具有迈克尔受体功能,可与酶形成共价键;具有生物素标签,可富集探针结合的多肽;具有化学可裂解连接体,可促进探针结合的多肽从阿维丁珠上释放。LC-MS 分析表明,RE142 与 CDC25A 的一个残基 Cys384-Tyr386 结合,该残基位于催化位点附近的一个口袋中。