ジャーナル: Sci Adv / 年: 2022 タイトル: Molecular architecture of the Chikungunya virus replication complex. 著者: Yaw Bia Tan / David Chmielewski / Michelle Cheok Yien Law / Kuo Zhang / Yu He / Muyuan Chen / Jing Jin / Dahai Luo / 要旨: To better understand how positive-strand (+) RNA viruses assemble membrane-associated replication complexes (RCs) to synthesize, process, and transport viral RNA in virus-infected cells, we ...To better understand how positive-strand (+) RNA viruses assemble membrane-associated replication complexes (RCs) to synthesize, process, and transport viral RNA in virus-infected cells, we determined both the high-resolution structure of the core RNA replicase of chikungunya virus and the native RC architecture in its cellular context at subnanometer resolution, using in vitro reconstitution and in situ electron cryotomography, respectively. Within the core RNA replicase, the viral polymerase nsP4, which is in complex with nsP2 helicase-protease, sits in the central pore of the membrane-anchored nsP1 RNA-capping ring. The addition of a large cytoplasmic ring next to the C terminus of nsP1 forms the holo-RNA-RC as observed at the neck of spherules formed in virus-infected cells. These results represent a major conceptual advance in elucidating the molecular mechanisms of RNA virus replication and the principles underlying the molecular architecture of RCs, likely to be shared with many pathogenic (+) RNA viruses.
超分子 #3: nsP4 RdRp; docked within nsP1 central cavity
超分子
名称: nsP4 RdRp; docked within nsP1 central cavity / タイプ: complex / ID: 3 / 親要素: 1 / 含まれる分子: #2 詳細: viral RdRp protein, single copy nsP4 slotted in the central pore of nsP1
由来(天然)
生物種: Onyong-nyong virus (ウイルス)
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超分子 #4: nsP2 helicase-protease; docked on top of viral complex with synth...
超分子
名称: nsP2 helicase-protease; docked on top of viral complex with synthetic RNA bound タイプ: complex / ID: 4 / 親要素: 1 / 含まれる分子: #3-#4 / 詳細: only helicase density was observed
名称: mRNA-capping enzyme nsP1,affinity-tag (strepII-3XFLAG) タイプ: protein_or_peptide / ID: 1 詳細: 1. affinity-tag (strepII-3XFLAG) insertion in between residue number 517-552; 2. replaced the last residue A535 with short peptide-tag NGL (corresponding to position 571-573) コピー数: 12 / 光学異性体: LEVO EC番号: 転移酵素; 一炭素原子の基を移すもの; メチル基を移すもの
名称: RNA-directed RNA polymerase nsP4 / タイプ: protein_or_peptide / ID: 2 詳細: Sourced from virus isolate cDNA, not available in uniprot database at the time of biocuration コピー数: 1 / 光学異性体: LEVO / EC番号: polynucleotide adenylyltransferase
名称: Protease nsP2 / タイプ: protein_or_peptide / ID: 3 詳細: helicase region is built on visible 3D electron density map but not protease region コピー数: 1 / 光学異性体: LEVO / EC番号: polynucleotide 5'-phosphatase
クラス数: 6 / 平均メンバー数/クラス: 95000 / ソフトウェア - 名称: cryoSPARC (ver. 3.3.1) / ソフトウェア - 詳細: 3D Classification / 詳細: the 6th class has the highest number of particles