Structure–Activity Relationships of Neplanocin A Analogues as <i>S</i>-Adenosylhomocysteine Hydrolase Inhibitors and Their Antiviral and Antitumor Activities
作者:Girish Chandra、Yang Won Moon、Yoonji Lee、Ji Yong Jang、Jayoung Song、Akshata Nayak、Kawon Oh、Varughese A. Mulamoottil、Pramod K. Sahu、Gyudong Kim、Tong-Shin Chang、Minsoo Noh、Sang Kook Lee、Sun Choi、Lak Shin Jeong
DOI:10.1021/acs.jmedchem.5b00553
日期:2015.6.25
On the basis of the potent inhibitory activity of neplanocin A (1) against S-adenosylhomocysteine (AdoHcy) hydrolase, we analyzed the comprehensive structure-activity relationships by modifying the adenine and carbasugar moiety of 1 to find the pharmacophore in the active site of the enzyme. The introduction of 7-deazaadenine instead of adenine eliminated the inhibitory activity against the AdoHcy hydrolase, while 3-deazaadenine maintained the inhibitory activity of the enzyme, indicating that N-7 is essential for its role as a hydrogen bonding acceptor. The substitution of hydrogen at the 6'-position with fluorine increased the inhibitory activity Of the enzyme. The one-carbon homologation at the 5'-position generally decreased the inhibitory activity of the enzyme, indicating that steric repulsion exists. A molecular docking study also supported these experimental data. In this study, 6'-fluoroneplanocin A (2) was the most potent inhibitor of AdoHcy hydrolase (IC50 = 0.24 mu M). It showed a potent anti-VSV activity (EC50 = 0.43 mu M) and potent anticancer activity in all the human tumor cell lines tested.