Cyclophilin B stimulates RNA synthesis by the HCV RNA dependent RNA polymerase.

Cyclophilin B stimulates RNA synthesis by the HCV RNA dependent RNA polymerase.
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DOI:
10.1016/j.bcp.2008.12.019
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发表时间:
2009-04-01
影响因子:
5.8
通讯作者:
Frick, David N.
Frick, David N.
中科院分区:
医学2区
文献类型:
--
作者:
Heck, Julie A.;Meng, Xiao;Frick, David N.

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亲环素是细胞肽基异构酶,参与调节丙型肝炎病毒(HCV)复制。亲环素B(Cyp B)是环孢菌素A(CsA)的靶点,环孢菌素A是一种最近被证明可以抑制细胞培养物中HCV复制的免疫抑制药物。Watashi等人最近证明CypB对于有效的HCV复制是重要的,并提出它通过与NS 5 B的相互作用介导CsA的抗HCV作用(Mol. Cell 19:111)。我们研究了纯化的CypB蛋白对NS 5 B酶活性的影响。从昆虫细胞中纯化的重组CypB直接刺激NS 5 B催化的RNA合成。CypB增加来自基因型1a、1b和2a HCV毒株的NS 5 B的RNA合成。刺激似乎是由生产性RNA结合的增加引起的。NS 5 B残基Pro540是先前提出的CypB肽基-脯氨酰异构酶活性的靶点,它不需要刺激RNA合成。
Cyclophilins are cellular peptidyl isomerases that have been implicated in regulating hepatitis C virus (HCV) replication. Cyclophilin B (CypB) is a target of cyclosporin A (CsA), an immunosuppressive drug recently shown to suppress HCV replication in cell culture. Watashi et al. recently demonstrated that CypB is important for efficient HCV replication, and proposed that it mediates the anti-HCV effects of CsA through an interaction with NS5B (Mol. Cell 19:111). We examined the effects of purified CypB proteins on the enzymatic activity of NS5B. Recombinant CypB purified from insect cells directly stimulated NS5B-catalyzed RNA synthesis. CypB increased RNA synthesis by NS5B derived from genotype 1a, 1b, and 2a HCV strains. Stimulation appears to arise from an increase in productive RNA binding. NS5B residue Pro540, a previously proposed target of CypB peptidyl-prolyl isomerase activity, is not required for stimulation of RNA synthesis.
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