【文章名】X-ray Crystal Structure and Binding Mode Analysis of Human S-Adenosylhomocysteine Hydrolase Complexed with Novel Mechanism-Based Inhibitors, Haloneplanocin A Analogues
X-ray Crystal Structure and Binding Mode Analysis of Human S-Adenosylhomocysteine Hydrolase Complexed with Novel Mechanism-Based Inhibitors, Haloneplanocin A Analogues
作者
LEE KANG MAN; CHOI WON JUN; LEE YOONJI; LEE HYUN JOO; ZHAO LONG XUAN; LEE HYUK WOO; PARK JAE GYU; KIM HEA OK; HWANG KWANG YEON; HEO YONGSEOK; CHOI SUN; JEONG LAK SHIN
[摘要]:The X-ray crystal structure of human S-adenosylhomocysteine (AdoHcy) hydrolase was first determined as a tetrameric form bound with the novel mechanism-based inhibitor fluoroneplanocin A (4b). The crystallized enzyme complex showed the closed conformation and turned out to be the intermediate of mechanism-based inhibition. It confirmed that the cofactor depletion by 3'-oxidation of fluoroneplanocin A contributes to the enzyme inhibition along with the irreversible covalent modification of AdoHcy hydrolase. In addition, a series of haloneplanocin A analogues (4b-e and 5b-e) were designed and synthesized to characterize the binding role and reactivity of the halogen substituents and the 4'-CH2OH group. The biological evaluation and molecular modeling studies identified the key pharmacophores and structural requirements for the inhibitor binding of AdoHcy hydrolase. The inhibitory activity was decreased as the size of the halogen atom increased and/or if the 4'-CH2OH group was absent. These results could be utilized to design new therapeutic agents operating via AdoHcy hydrolase inhibition.