Complexes of HIV-1 RT, NNRTI and RNA/DNA hybrid reveal a structure compatible with RNA degradation.

Complexes of HIV-1 RT, NNRTI and RNA/DNA hybrid reveal a structure compatible with RNA degradation.
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DOI:
10.1038/nsmb.2485
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发表时间:
2013-02
影响因子:
16.8
通讯作者:
Yang, Wei
Yang, Wei
中科院分区:
生物学1区
文献类型:
--
作者:
Lapkouski, Mikalai;Tian, Lan;Miller, Jennifer T.;Le Grice, Stuart F. J.;Yang, Wei

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1型人类免疫缺陷病毒(HIV-1)逆转录酶(RT)的结构已被确定为几种形式,但只有一种含有RNA/DNA杂合体。在这里,我们报告了三种结构的HIV-1 RT与非核苷酸RT抑制剂(NNRTI)和RNA/DNA杂交复合。在存在NNRTI的情况下,RNA/DNA结构不同于与RT结合的所有先前核酸,包括RNA/DNA杂合体。酶的结构也不同于所有以前的RT-DNA复合物。因此,杂交体可以随时进入RNase H活性位点。这些观察结果表明,RT-核酸复合物可以采用两种结构状态,一种能够进行DNA聚合,另一种能够进行RNA降解。RT突变,赋予耐药性,但远离信使结合位点往往映射到独特的RT杂交界面,经历两个催化状态之间的构象变化。
Structures of type-1 human immunodeficiency virus (HIV-1) reverse transcriptase (RT) have been determined in several forms, but only one contains an RNA/DNA hybrid. Here we report three structures of HIV-1 RT complexed with a non-nucleotide RT inhibitor (NNRTI) and an RNA/DNA hybrid. In the presence of an NNRTI, the RNA/DNA structure differs from all prior nucleic acid bound to RT including the RNA/DNA hybrid. The enzyme structure also differs from all previous RT–DNA complexes. As a result, the hybrid has ready access to the RNase H active site. These observations indicate that an RT–nucleic acid complex may adopt two structural states, one competent for DNA polymerization and the other for RNA degradation. RT mutations that confer drug resistance but are distant from the inhibitor-binding sites often map to the unique RT–hybrid interface that undergoes conformational changes between two catalytic states.
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