Peptidyl cyclopropenones: Reversible inhibitors, irreversible inhibitors, or substrates of cysteine proteases?
作者:Meital Cohen、Uriel Bretler、Amnon Albeck
DOI:10.1002/pro.2260
日期:2013.6
as selective cysteine protease reversible inhibitors. In the present study we synthesized one such peptidyl cyclopropenone and investigated its interaction with papain, a prototype cysteine protease. A set of kinetics, biochemical, HPLC, MS, and (13)C-NMR experiments revealed that the peptidyl cyclopropenone was an irreversible inhibitor of the enzyme, alkylating the catalytic cysteine. In parallel
肽基环丙烯酮以前被引入作为选择性半胱氨酸蛋白酶可逆抑制剂。在本研究中,我们合成了一种这样的肽基环丙烯酮,并研究了它与木瓜蛋白酶(一种原型半胱氨酸蛋白酶)的相互作用。一组动力学、生化、HPLC、MS 和 (13) C-NMR 实验表明,肽基环丙烯酮是酶的不可逆抑制剂,可将催化半胱氨酸烷基化。同时,这种环丙烯酮还充当酶的替代底物,提供的产物暂时被认为是螺环环氧环丙酮或 γ-内酯。因此,单一家族的化合物表现出不同寻常的各种活性,是可逆抑制剂、不可逆抑制剂和同一家族酶的替代底物。