Structural basis of mismatch recognition by a SARS-CoV-2 proofreading enzyme.
Structural basis of mismatch recognition by a SARS-CoV-2 proofreading enzyme.
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SARS-CoV-2校正酶错配识别的结构基础。
DOI:
10.1126/science.abi9310
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发表时间:
2021-09-03
期刊:
影响因子:
56.9
通讯作者:
Yang, Yang
中科院分区:
文献类型:
--
作者:
Liu, Chang;Shi, Wei;Becker, Scott T.;Schatz, David G.;Liu, Bin;Yang, Yang
Although vaccines provide protection against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), there remains a need for antivirals to treat COVID-19. Nucleotide analog drugs such as remdesivir, which target the viral RNA polymerase, have potential but are compromised by exoribonuclease (ExoN) activity that removes incorrect nucleotides from newly synthesized RNA. Liu et al. determined the structure of the complex that harbors the ExoN activity (nsp10–nsp-14) bound to a mimic of RNA that has incorporated an incorrect nucleotide. The structure shows how the RNA is recognized and suggests how ExoN specifically removes mismatched nucleotides. It also provides clues for designing nucleotide analogs that may evade excision. —VV Structures of SARS-CoV-2 exonuclease–RNA complex provide insight into proofreading for potential antiviral development. Coronavirus 3′-to-5′ exoribonuclease (ExoN), residing in the nonstructural protein (nsp) 10–nsp14 complex, boosts replication fidelity by proofreading RNA synthesis and is critical for the virus life cycle. ExoN also recognizes and excises nucleotide analog inhibitors incorporated into the nascent RNA, undermining the effectiveness of nucleotide analog–based antivirals. Here we present cryo–electron microscopy structures of both wild-type and mutant severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) nsp10-nsp14 in complex with an RNA substrate bearing a 3′-end mismatch at resolutions ranging from 2.5 to 3.9 angstroms. The structures reveal the molecular determinants of ExoN substrate specificity and offer insight into the molecular mechanisms of mismatch correction during coronavirus RNA synthesis. Our findings provide guidance for rational design of improved anticoronavirus therapies.
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