To date, an effective therapeutic treatment that confers strong attenuation toward coronaviruses (CoVs) remains elusive. Of all the potential drug targets, the helicase of CoVs is considered to be one of the most important. Here, we first present the ...
To date, an effective therapeutic treatment that confers strong attenuation toward coronaviruses (CoVs) remains elusive. Of all the potential drug targets, the helicase of CoVs is considered to be one of the most important. Here, we first present the structure of the full-length Nsp13 helicase of SARS-CoV (SARS-Nsp13) and investigate the structural coordination of its five domains and how these contribute to its translocation and unwinding activity. A translocation model is proposed for the Upf1-like helicase members according to three different structural conditions in solution characterized through H/D exchange assay, including substrate state (SARS-Nsp13-dsDNA bound with AMPPNP), transition state (bound with ADP-AlF4-) and product state (bound with ADP). We observed that the β19-β20 loop on the 1A domain is involved in unwinding process directly. Furthermore, we have shown that the RNA dependent RNA polymerase (RdRp), SARS-Nsp12, can enhance the helicase activity of SARS-Nsp13 through interacting with it directly. The interacting regions were identified and can be considered common across CoVs, which provides new insights into the Replication and Transcription Complex (RTC) of CoVs.
Organizational Affiliation:
State Key Laboratory of Medicinal Chemical Biology, College of Life Science, Nankai University, Tianjin 300353, China.,State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China.,Laboratory of Structural Biology, School of Medicine, Tsinghua University, Beijing 100084, China.,Protein Chemistry Facility, Center for Biomedical Analysis of Tsinghua University, Beijing 100084, China.,State Key Laboratory of Conservation and Utilization of Subtropical Agro-Bioresources, College of Life Science and Technology, Guangxi University, Nanning, China.,Shanghai Institute for Advanced Immunochemical Studies and iHuman Institute, ShanghaiTech University, Shanghai 201210, China.
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