the National Research and Development Program of China
2016YFA0501103
中国
the National Research and Development Program of China
2015CB910104
中国
the National Natural Science Foundation of China
91530321
中国
the National Natural Science Foundation of China
31570727
中国
the National Natural Science Foundation of China
31570742
中国
引用
ジャーナル: J Mol Biol / 年: 2017 タイトル: Near-Atomic Resolution Structure Determination of a Cypovirus Capsid and Polymerase Complex Using Cryo-EM at 200kV. 著者: Xiaowu Li / Niyun Zhou / Wenyuan Chen / Bin Zhu / Xurong Wang / Bin Xu / Jiawei Wang / Hongrong Liu / Lingpeng Cheng / 要旨: Single-particle cryo-electron microscopy (cryo-EM) allows the high-resolution structural determination of biological assemblies in a near-native environment. However, all high-resolution (better than ...Single-particle cryo-electron microscopy (cryo-EM) allows the high-resolution structural determination of biological assemblies in a near-native environment. However, all high-resolution (better than 3.5Å) cryo-EM structures reported to date were obtained by using 300kV transmission electron microscopes (TEMs). We report here the structures of a cypovirus capsid of 750-Å diameter at 3.3-Å resolution and of RNA-dependent RNA polymerase (RdRp) complexes within the capsid at 3.9-Å resolution using a 200-kV TEM. The newly resolved structure revealed conformational changes of two subdomains in the RdRp. These conformational changes, which were involved in RdRp's switch from non-transcribing to transcribing mode, suggest that the RdRp may facilitate the unwinding of genomic double-stranded RNA. The possibility of 3-Å resolution structural determinations for biological assemblies of relatively small sizes using cryo-EM at 200kV was discussed.
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2017年1月25日
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2017年1月25日
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