+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 6mrm | ||||||
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タイトル | Red Clover Necrotic Mosaic Virus | ||||||
要素 | Capsid protein | ||||||
キーワード | VIRUS / RCNMV | ||||||
機能・相同性 | 機能・相同性情報 | ||||||
生物種 | Red clover necrotic mosaic virus (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: 2.9 Å | ||||||
データ登録者 | Sherman, M.B. / Smith, T.J. | ||||||
引用 | ジャーナル: J Virol / 年: 2020 タイトル: Near-Atomic-Resolution Cryo-Electron Microscopy Structures of Cucumber Leaf Spot Virus and Red Clover Necrotic Mosaic Virus: Evolutionary Divergence at the Icosahedral Three-Fold Axes. 著者: Michael B Sherman / Richard Guenther / Ron Reade / D'Ann Rochon / Tim Sit / Thomas J Smith / 要旨: Members of the family have highly similar structures, and yet there are important differences among them in host, transmission, and capsid stabilities. Viruses in the family have single-stranded ...Members of the family have highly similar structures, and yet there are important differences among them in host, transmission, and capsid stabilities. Viruses in the family have single-stranded RNA (ssRNA) genomes with T=3 icosahedral protein shells with a maximum diameter of ∼340 Å. Each capsid protein is comprised of three domains: R (RNA binding), S (shell), and P (protruding). Between the R domain and S domain is the "arm" region that studies have shown to play a critical role in assembly. To better understand how the details of structural differences and similarities influence the viral life cycles, the structures of cucumber leaf spot virus (CLSV; genus ) and red clover necrotic mosaic virus (RCNMV; genus ) were determined to resolutions of 3.2 Å and 2.9 Å, respectively, with cryo-electron microscopy and image reconstruction methods. While the shell domains had homologous structures, the stabilizing interactions at the icosahedral 3-fold axes and the R domains differed greatly. The heterogeneity in the R domains among the members of the family is likely correlated with differences in the sizes and characteristics of the corresponding genomes. We propose that the changes in the R domain/RNA interactions evolved different arm domain interactions at the β-annuli. For example, RCNMV has the largest genome and it appears to have created the necessary space in the capsid by evolving the shortest R domain. The resulting loss in RNA/R domain interactions may have been compensated for by increased intersubunit β-strand interactions at the icosahedral 3-fold axes. Therefore, the R and arm domains may have coevolved to package different genomes within the conserved and rigid shell. Members of the family have nearly identical shells, and yet they package genomes that range from 4.6 kb (monopartite) to 5.3 kb (bipartite) in size. To understand how this genome flexibility occurs within a rigidly conserved shell, we determined the high-resolution cryo-electron microscopy (cryo-EM) structures of cucumber leaf spot virus and red clover necrotic mosaic virus. In response to genomic size differences, it appears that the ssRNA binding (R) domain of the capsid diverged evolutionarily in order to recognize the different genomes. The next region, the "arm," seems to have also coevolved with the R domain to allow particle assembly via interactions at the icosahedral 3-fold axes. In addition, there are differences at the icosahedral 3-fold axes with regard to metal binding that are likely important for transmission and the viral life cycle. | ||||||
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 | 6mrm.cif.gz | 160.9 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb6mrm.ent.gz | 128.3 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 6mrm.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 | 6mrm_validation.pdf.gz | 1.1 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 6mrm_full_validation.pdf.gz | 1.1 MB | 表示 | |
XML形式データ | 6mrm_validation.xml.gz | 33.1 KB | 表示 | |
CIF形式データ | 6mrm_validation.cif.gz | 47.7 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/mr/6mrm ftp://data.pdbj.org/pub/pdb/validation_reports/mr/6mrm | HTTPS FTP |
-関連構造データ
-リンク
-集合体
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対称性 | 点対称性: (シェーンフリース記号: I (正20面体型対称)) |
-要素
#1: タンパク質 | 分子量: 36617.473 Da / 分子数: 3 / 由来タイプ: 天然 由来: (天然) Red clover necrotic mosaic virus (ウイルス) 参照: UniProt: P22955 #2: 化合物 | |
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-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: Red clover necrotic mosaic virus / タイプ: VIRUS / Entity ID: #1 / 由来: NATURAL |
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由来(天然) | 生物種: Red clover necrotic mosaic virus (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 |
緩衝液 | pH: 7 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | 詳細: unspecified |
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: 54 e/Å2 フィルム・検出器のモデル: DIRECT ELECTRON DE-64 (8k x 8k) |
-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: 2.9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 1236 / 対称性のタイプ: POINT |