Psammaplin A inhibits hepatitis C virus NS3 helicase
Psammaplin A inhibits hepatitis C virus NS3 helicase
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Psammaplin A 抑制丙型肝炎病毒 NS3 解旋酶
DOI:
10.1007/s11418-013-0742-7
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
N
中科院分区:
文献类型:
--
作者:
Salam;K.A.; Furuta;A.; Noda;N.; Tsuneda;S.; Sekiguchi;Y.; Yamashita;A.; Moriishi;K.; Nakakoshi;M.; Tsubuki;M.; Tani;H.; Tanaka;J.; Akimitsu;N
Hepatitis C virus (HCV) is the causative agent of hepatitis C, a chronic infectious disease that can lead to development of hepatocellular carcinoma. The NS3 nucleoside triphosphatase (NTPase)/helicase has an essential role in HCV replication, and is therefore an attractive target for direct-acting antiviral strategies. In this study, we employed high-throughput screening using a photo-induced electron transfer (PET) system to identify an inhibitor of NS3 helicase from marine organism extracts. We successfully identified psammaplin A as a novel NS3 inhibitor. The dose–response relationship clearly demonstrates the inhibition of NS3 RNA helicase and ATPase activities by psammaplin A, with IC50values of 17 and 32 μM, respectively. Psammaplin A has no influence on the apparentKmvalue (0.4 mM) of NS3 ATPase activity, and acts as a non-competitive inhibitor. Additionally, it inhibits the binding of NS3 to single-stranded RNA in a dose-dependent manner. Furthermore, psammaplin A shows an inhibitory effect on viral replication, with EC50values of 6.1 and 6.3 μM in subgenomic replicon cells derived from genotypes 1b and 2a, respectively. We postulate that psammaplin A is a potential anti-viral agent through the inhibition of ATPase, RNA binding and helicase activities of NS3.
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