+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 6m99 | |||||||||||||||||||||||||||
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タイトル | In situ structure of transcriptional enzyme complex and asymmetric inner capsid protein of aquareovirus at primed state | |||||||||||||||||||||||||||
要素 |
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キーワード | VIRAL PROTEIN / Reovirus / transcriptional enzyme complex / polymerase / RdRp / NTPase | |||||||||||||||||||||||||||
機能・相同性 | 機能・相同性情報 viral inner capsid / host cytoskeleton / 7-methylguanosine mRNA capping / viral genome replication / viral capsid / viral nucleocapsid / host cell cytoplasm / RNA helicase activity / hydrolase activity / RNA helicase ...viral inner capsid / host cytoskeleton / 7-methylguanosine mRNA capping / viral genome replication / viral capsid / viral nucleocapsid / host cell cytoplasm / RNA helicase activity / hydrolase activity / RNA helicase / RNA-directed RNA polymerase / RNA-dependent RNA polymerase activity / structural molecule activity / RNA binding / metal ion binding 類似検索 - 分子機能 | |||||||||||||||||||||||||||
生物種 | Grass carp reovirus (ウイルス) | |||||||||||||||||||||||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.4 Å | |||||||||||||||||||||||||||
データ登録者 | Ding, K. / Zhou, Z.H. | |||||||||||||||||||||||||||
資金援助 | 米国, 8件
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引用 | ジャーナル: J Virol / 年: 2018 タイトル: Structures of the Polymerase Complex and RNA Genome Show How Aquareovirus Transcription Machineries Respond to Uncoating. 著者: Ke Ding / Lisa Nguyen / Z Hong Zhou / 要旨: Reoviruses carry out genomic RNA transcription within intact viruses to synthesize plus-sense RNA strands, which are capped prior to their release as mRNA. The structures of the transcriptional ...Reoviruses carry out genomic RNA transcription within intact viruses to synthesize plus-sense RNA strands, which are capped prior to their release as mRNA. The structures of the transcriptional enzyme complex (TEC) containing the RNA-dependent RNA polymerase (RdRp) and NTPase are known for the single-layered reovirus cytoplasmic polyhedrosis virus (CPV), but not for multilayered reoviruses, such as aquareoviruses (ARV), which possess a primed stage that CPV lacks. Consequently, how the RNA genome and TEC respond to priming in reoviruses is unknown. Here, we determined the near-atomic-resolution asymmetric structure of ARV in the primed state by cryo-electron microscopy (cryo-EM), revealing the structures of 11 TECs inside each capsid and their interactions with the 11 surrounding double-stranded RNA (dsRNA) genome segments and with the 120 enclosing capsid shell protein (CSP) VP3 subunits. The RdRp VP2 and the NTPase VP4 associate with each other and with capsid vertices; both bind RNA in multiple locations, including a novel C-terminal domain of VP4. Structural comparison between the primed and quiescent states showed translocation of the dsRNA end from the NTPase to the RdRp during priming. The RNA template channel was open in both states, suggesting that channel blocking is not a regulating mechanism between these states in ARV. Instead, the NTPase C-terminal domain appears to regulate RNA translocation between the quiescent and primed states. Taking the data together, dsRNA viruses appear to have adapted divergent mechanisms to regulate genome transcription while retaining similar mechanisms to coassemble their genome segments, TEC, and capsid proteins into infectious virions. Viruses in the family are characterized by the ability to endogenously synthesize nascent RNA within the virus. However, the mechanisms for assembling their RNA genomes with transcriptional enzymes into a multilayered virion and for priming such a virion for transcription are poorly understood. By cryo-EM and novel asymmetric reconstruction, we determined the atomic structure of the transcription complex inside aquareoviruses (ARV) that are primed for infection. The transcription complex is anchored by the N-terminal segments of enclosing capsid proteins and contains an NTPase and a polymerase. The NTPase has a newly discovered domain that translocates the 5' end of plus-sense RNA in segmented dsRNA genomes from the NTPase to polymerase VP2 when the virus changes from the inactive (quiescent) to the primed state. Conformation changes in capsid proteins and transcriptional complexes suggest a mechanism for relaying information from the outside to the inside of the virus during priming. | |||||||||||||||||||||||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 6m99.cif.gz | 2.1 MB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb6m99.ent.gz | 表示 | PDB形式 | |
PDBx/mmJSON形式 | 6m99.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 6m99_validation.pdf.gz | 1.4 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 6m99_full_validation.pdf.gz | 1.5 MB | 表示 | |
XML形式データ | 6m99_validation.xml.gz | 306.5 KB | 表示 | |
CIF形式データ | 6m99_validation.cif.gz | 470.3 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/m9/6m99 ftp://data.pdbj.org/pub/pdb/validation_reports/m9/6m99 | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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-要素
#1: タンパク質 | 分子量: 141685.438 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Grass carp reovirus (ウイルス) / 参照: UniProt: Q9E3V9 | ||||||
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#2: タンパク質 | 分子量: 80381.516 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Grass carp reovirus (ウイルス) / 参照: UniProt: Q8JU68 | ||||||
#3: タンパク質 | 分子量: 132203.312 Da / 分子数: 10 / 由来タイプ: 天然 / 由来: (天然) Grass carp reovirus (ウイルス) / 参照: UniProt: Q9E3V8 #4: 化合物 | ChemComp-PO4 / | #5: 化合物 | ChemComp-ZN / | Has protein modification | Y | |
-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
-試料調製
構成要素 | 名称: transcriptional enzyme complex and asymmetric inner capsid protein タイプ: VIRUS / Entity ID: #1-#3 / 由来: NATURAL |
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分子量 | 実験値: NO |
由来(天然) | 生物種: Grass carp reovirus (ウイルス) |
ウイルスについての詳細 | 中空か: NO / エンベロープを持つか: NO / 単離: STRAIN / タイプ: VIRION |
天然宿主 | 生物種: Ctenopharyngodon idella |
緩衝液 | pH: 7.5 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 400 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 |
急速凍結 | 凍結剤: ETHANE |
-電子顕微鏡撮影
実験機器 | モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD |
撮影 | 電子線照射量: 25 e/Å2 フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
-解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3次元再構成 | 解像度: 3.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 73472 / アルゴリズム: FOURIER SPACE / 対称性のタイプ: POINT |