+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-5948 | |||||||||
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タイトル | Three-dimensional structure of a protozoal dsRNA virus that infects enteric pathogen Giardia lamblia | |||||||||
マップデータ | Icosahedral reconstruction of giardiavirus | |||||||||
試料 |
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キーワード | Giardia lamblia virus / protozoal virus / dsRNA virus / icosahedral image reconstruction / cryoTEM / infects Giardia lamblia | |||||||||
生物種 | Giardia lamblia virus (ウイルス) | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 6.0 Å | |||||||||
データ登録者 | Janssen ME / Takagi Y / Parent KN / Cardone G / Fichorova RN / Nibert ML / Baker TS | |||||||||
引用 | ジャーナル: J Virol / 年: 2015 タイトル: Three-dimensional structure of a protozoal double-stranded RNA virus that infects the enteric pathogen Giardia lamblia. 著者: Mandy E W Janssen / Yuko Takagi / Kristin N Parent / Giovanni Cardone / Max L Nibert / Timothy S Baker / 要旨: Giardia lamblia virus (GLV) is a small, nonenveloped, nonsegmented double-stranded RNA (dsRNA) virus infecting Giardia lamblia, the most common protozoan pathogen of the human intestine and a major ...Giardia lamblia virus (GLV) is a small, nonenveloped, nonsegmented double-stranded RNA (dsRNA) virus infecting Giardia lamblia, the most common protozoan pathogen of the human intestine and a major agent of waterborne diarrheal disease worldwide. GLV (genus Giardiavirus) is a member of family Totiviridae, along with several other groups of protozoal or fungal viruses, including Leishmania RNA viruses and Trichomonas vaginalis viruses. Interestingly, GLV is more closely related than other Totiviridae members to a group of recently discovered metazoan viruses that includes penaeid shrimp infectious myonecrosis virus (IMNV). Moreover, GLV is the only known protozoal dsRNA virus that can transmit efficiently by extracellular means, also like IMNV. In this study, we used transmission electron cryomicroscopy and icosahedral image reconstruction to examine the GLV virion at an estimated resolution of 6.0 Å. Its outermost diameter is 485 Å, making it the largest totivirus capsid analyzed to date. Structural comparisons of GLV and other totiviruses highlighted a related "T=2" capsid organization and a conserved helix-rich fold in the capsid subunits. In agreement with its unique capacity as a protozoal dsRNA virus to survive and transmit through extracellular environments, GLV was found to be more thermoresistant than Trichomonas vaginalis virus 1, but no specific protein machinery to mediate cell entry, such as the fiber complexes in IMNV, could be localized. These and other structural and biochemical findings provide a basis for future work to dissect the cell entry mechanism of GLV into a "primitive" (early-branching) eukaryotic host and an important enteric pathogen of humans. IMPORTANCE: Numerous pathogenic bacteria, including Corynebacterium diphtheriae, Salmonella enterica, and Vibrio cholerae, are infected with lysogenic bacteriophages that contribute significantly to ...IMPORTANCE: Numerous pathogenic bacteria, including Corynebacterium diphtheriae, Salmonella enterica, and Vibrio cholerae, are infected with lysogenic bacteriophages that contribute significantly to bacterial virulence. In line with this phenomenon, several pathogenic protozoa, including Giardia lamblia, Leishmania species, and Trichomonas vaginalis are persistently infected with dsRNA viruses, and growing evidence indicates that at least some of these protozoal viruses can likewise enhance the pathogenicity of their hosts. Understanding of these protozoal viruses, however, lags far behind that of many bacteriophages. Here, we investigated the dsRNA virus that infects the widespread enteric parasite Giardia lamblia. Using electron cryomicroscopy and icosahedral image reconstruction, we determined the virion structure of Giardia lamblia virus, obtaining new information relating to its assembly, stability, functions in cell entry and transcription, and similarities and differences with other dsRNA viruses. The results of our study set the stage for further mechanistic work on the roles of these viruses in protozoal virulence. | |||||||||
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 | EMマップ: SurfViewMolmilJmol/JSmol |
添付画像 |
-ダウンロードとリンク
-EMDBアーカイブ
マップデータ | emd_5948.map.gz | 143.2 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-5948-v30.xml emd-5948.xml | 10.3 KB 10.3 KB | 表示 表示 | EMDBヘッダ |
画像 | emd_5948.png | 401 KB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-5948 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-5948 | HTTPS FTP |
-関連構造データ
-リンク
EMDBのページ | EMDB (EBI/PDBe) / EMDataResource |
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-マップ
ファイル | ダウンロード / ファイル: emd_5948.map.gz / 形式: CCP4 / 大きさ: 808.7 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Icosahedral reconstruction of giardiavirus | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.09 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
-試料の構成要素
-全体 : GLV virion
全体 | 名称: GLV virion |
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要素 |
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-超分子 #1000: GLV virion
超分子 | 名称: GLV virion / タイプ: sample / ID: 1000 / 集合状態: icosahedral / Number unique components: 1 |
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-超分子 #1: Giardia lamblia virus
超分子 | 名称: Giardia lamblia virus / タイプ: virus / ID: 1 / Name.synonym: GLV / NCBI-ID: 29255 / 生物種: Giardia lamblia virus / Sci species strain: WBI / データベース: NCBI / ウイルスタイプ: VIRION / ウイルス・単離状態: STRAIN / ウイルス・エンベロープ: No / ウイルス・中空状態: No / Syn species name: GLV |
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宿主 | 生物種: Giardia intestinalis (ランブル鞭毛虫) / 株: WBI / 別称: PROTOZOA |
ウイルス殻 | Shell ID: 1 / 直径: 485 Å / T番号(三角分割数): 2 |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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解析 | 単粒子再構成法 |
試料の集合状態 | particle |
-試料調製
濃度 | 0.02 mg/mL |
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緩衝液 | pH: 7.2 / 詳細: 50 mM HEPES, 500 mM NaCl, 20 mM MgCl2 |
グリッド | 詳細: Quantifoil R2/2 |
凍結 | 凍結剤: ETHANE / チャンバー内湿度: 99 % / チャンバー内温度: 90 K / 装置: HOMEMADE PLUNGER / 手法: Blot 5 sec before plunging |
-電子顕微鏡法
顕微鏡 | FEI POLARA 300 |
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電子線 | 加速電圧: 200 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 倍率(補正後): 58050 / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELDBright-field microscopy / Cs: 2.26 mm / 最大 デフォーカス(公称値): 3.41 µm / 最小 デフォーカス(公称値): 0.78 µm / 倍率(公称値): 59000 |
試料ステージ | 試料ホルダーモデル: OTHER |
温度 | 最低: 90 K / 最高: 96 K / 平均: 93 K |
アライメント法 | Legacy - 非点収差: Objective lens astigmatism was corrected at 135,000 times magnification. |
日付 | 2012年4月18日 |
撮影 | カテゴリ: FILM / フィルム・検出器のモデル: KODAK SO-163 FILM / デジタル化 - スキャナー: OTHER / デジタル化 - サンプリング間隔: 6.35 µm / 実像数: 101 / 平均電子線量: 25 e/Å2 / ビット/ピクセル: 8 |
Tilt angle min | 0 |
Tilt angle max | 0 |
実験機器 | モデル: Tecnai Polara / 画像提供: FEI Company |
-画像解析
CTF補正 | 詳細: robem |
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最終 再構成 | アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 6.0 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: auto3dem 詳細: Particles were selected and preprocessed using RobEM. 使用した粒子像数: 14125 |
詳細 | Particles were selected and preprocessed using RobEM. Image reconstruction was performed using Auto3DEM. |