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:
J. Nat. Med. in press
影响因子:
--
通讯作者:
N
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

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丙型肝炎病毒是丙型肝炎的病原体,丙型肝炎是一种慢性传染病,可导致肝细胞癌的发生。NS3核苷三磷酸酶(NTPase)/解旋酶在丙型肝炎病毒复制中起着至关重要的作用,因此是直接作用抗病毒策略的一个有吸引力的靶点。在这项研究中,我们使用光致电子转移(PET)系统的高通量筛选来从海洋生物提取物中鉴定NS3解旋酶的抑制物。我们成功地将Psammaplin A鉴定为一种新的NS3抑制剂。剂量-反应关系表明,Psammaplin A对NS3RNA解旋酶和ATPase活性有明显的抑制作用,IC50值分别为17和32μM。Psammaplin A对NS3ATPase的表观Km值(0.4 mM)无影响,为非竞争性抑制物。此外,它还以剂量依赖的方式抑制NS3与单链RNA的结合。此外,Psammaplin A对病毒复制有抑制作用,1b和2a亚型复制子细胞的EC50值分别为6.1和6.3gμM。通过抑制NS3的ATPase、RNA结合和解旋酶活性,我们推测Psammaplin A是一种潜在的抗病毒药物。
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.
可用作丙型肝炎病毒NS3解旋酶抑制剂的五环化合物
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