+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-8100 | |||||||||||||||
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タイトル | Structure of the R432A variant of Adeno-associated virus type 2 VLP | |||||||||||||||
マップデータ | None | |||||||||||||||
試料 |
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キーワード | Adeno-associated virus / R432A / gene therapy / icosahedral / dependoparvovirus / VIRUS LIKE PARTICLE | |||||||||||||||
機能・相同性 | 機能・相同性情報 permeabilization of host organelle membrane involved in viral entry into host cell / symbiont entry into host cell via permeabilization of inner membrane / host cell nucleolus / T=1 icosahedral viral capsid / clathrin-dependent endocytosis of virus by host cell / virion attachment to host cell / structural molecule activity 類似検索 - 分子機能 | |||||||||||||||
生物種 | Adeno-associated virus - 2 (アデノ随伴ウイルス) | |||||||||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.7 Å | |||||||||||||||
データ登録者 | Drouin LM / Lins B | |||||||||||||||
資金援助 | 米国, 4件
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引用 | ジャーナル: J Virol / 年: 2016 タイトル: Cryo-electron Microscopy Reconstruction and Stability Studies of the Wild Type and the R432A Variant of Adeno-associated Virus Type 2 Reveal that Capsid Structural Stability Is a Major ...タイトル: Cryo-electron Microscopy Reconstruction and Stability Studies of the Wild Type and the R432A Variant of Adeno-associated Virus Type 2 Reveal that Capsid Structural Stability Is a Major Factor in Genome Packaging. 著者: Lauren M Drouin / Bridget Lins / Maria Janssen / Antonette Bennett / Paul Chipman / Robert McKenna / Weijun Chen / Nicholas Muzyczka / Giovanni Cardone / Timothy S Baker / Mavis Agbandje-McKenna / 要旨: The adeno-associated viruses (AAV) are promising therapeutic gene delivery vectors and better understanding of their capsid assembly and genome packaging mechanism is needed for improved vector ...The adeno-associated viruses (AAV) are promising therapeutic gene delivery vectors and better understanding of their capsid assembly and genome packaging mechanism is needed for improved vector production. Empty AAV capsids assemble in the nucleus prior to genome packaging by virally encoded Rep proteins. To elucidate the capsid determinants of this process, structural differences between wild-type (wt) AAV2 and a packaging deficient variant, AAV2-R432A, were examined using cryo-electron microscopy and three-dimensional image reconstruction both at an ∼5.0-Å resolution (medium) and also at 3.8- and 3.7-Å resolutions (high), respectively. The high resolution structures showed that removal of the arginine side chain in AAV2-R432A eliminated hydrogen bonding interactions, resulting in altered intramolecular and intermolecular interactions propagated from under the 3-fold axis toward the 5-fold channel. Consistent with these observations, differential scanning calorimetry showed an ∼10°C decrease in thermal stability for AAV2-R432A compared to wt-AAV2. In addition, the medium resolution structures revealed differences in the juxtaposition of the less ordered, N-terminal region of their capsid proteins, VP1/2/3. A structural rearrangement in AAV2-R432A repositioned the βA strand region under the icosahedral 2-fold axis rather than antiparallel to the βB strand, eliminating many intramolecular interactions. Thus, a single amino acid substitution can significantly alter the AAV capsid integrity to the extent of reducing its stability and possibly rendering it unable to tolerate the stress of genome packaging. Furthermore, the data show that the 2-, 3-, and 5-fold regions of the capsid contributed to producing the packaging defect and highlight a tight connection between the entire capsid in maintaining packaging efficiency. IMPORTANCE: The mechanism of AAV genome packaging is still poorly understood, particularly with respect to the capsid determinants of the required capsid-Rep interaction. Understanding this mechanism ...IMPORTANCE: The mechanism of AAV genome packaging is still poorly understood, particularly with respect to the capsid determinants of the required capsid-Rep interaction. Understanding this mechanism may aid in the improvement of AAV packaging efficiency, which is currently ∼1:10 (10%) genome packaged to empty capsid in vector preparations. This report identifies regions of the AAV capsid that play roles in genome packaging and that may be important for Rep recognition. It also demonstrates the need to maintain capsid stability for the success of this process. This information is important for efforts to improve AAV genome packaging and will also inform the engineering of AAV capsid variants for improved tropism, specific tissue targeting, and host antibody escape by defining amino acids that cannot be altered without detriment to infectious vector production. | |||||||||||||||
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_8100.map.gz | 28.9 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-8100-v30.xml emd-8100.xml | 14.5 KB 14.5 KB | 表示 表示 | EMDBヘッダ |
画像 | emd_8100.png | 292 KB | ||
Filedesc metadata | emd-8100.cif.gz | 6.3 KB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-8100 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-8100 | HTTPS FTP |
-検証レポート
文書・要旨 | emd_8100_validation.pdf.gz | 542.2 KB | 表示 | EMDB検証レポート |
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文書・詳細版 | emd_8100_full_validation.pdf.gz | 541.7 KB | 表示 | |
XML形式データ | emd_8100_validation.xml.gz | 7 KB | 表示 | |
CIF形式データ | emd_8100_validation.cif.gz | 8 KB | 表示 | |
アーカイブディレクトリ | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-8100 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-8100 | 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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「今月の分子」の関連する項目 |
-マップ
ファイル | ダウンロード / ファイル: emd_8100.map.gz / 形式: CCP4 / 大きさ: 135.8 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | None | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.1 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 : Adeno-associated virus - 2
全体 | 名称: Adeno-associated virus - 2 (アデノ随伴ウイルス) |
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要素 |
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-超分子 #1: Adeno-associated virus - 2
超分子 | 名称: Adeno-associated virus - 2 / タイプ: virus / ID: 1 / 親要素: 0 / 含まれる分子: all / NCBI-ID: 10804 / 生物種: Adeno-associated virus - 2 / ウイルスタイプ: VIRUS-LIKE PARTICLE / 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 |
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宿主 | 生物種: Homo sapiens (ヒト) |
-分子 #1: Capsid protein VP1
分子 | 名称: Capsid protein VP1 / タイプ: protein_or_peptide / ID: 1 / コピー数: 60 / 光学異性体: LEVO |
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由来(天然) | 生物種: Adeno-associated virus - 2 (アデノ随伴ウイルス) |
分子量 | 理論値: 81.945234 KDa |
組換発現 | 生物種: unidentified baculovirus (ウイルス) |
配列 | 文字列: MAADGYLPDW LEDTLSEGIR QWWKLKPGPP PPKPAERHKD DSRGLVLPGY KYLGPFNGLD KGEPVNEADA AALEHDKAYD RQLDSGDNP YLKYNHADAE FQERLKEDTS FGGNLGRAVF QAKKRVLEPL GLVEEPVKTA PGKKRPVEHS PVEPDSSSGT G KAGQQPAR ...文字列: MAADGYLPDW LEDTLSEGIR QWWKLKPGPP PPKPAERHKD DSRGLVLPGY KYLGPFNGLD KGEPVNEADA AALEHDKAYD RQLDSGDNP YLKYNHADAE FQERLKEDTS FGGNLGRAVF QAKKRVLEPL GLVEEPVKTA PGKKRPVEHS PVEPDSSSGT G KAGQQPAR KRLNFGQTGD ADSVPDPQPL GQPPAAPSGL GTNTMATGSG APMADNNEGA DGVGNSSGNW HCDSTWMGDR VI TTSTRTW ALPTYNNHLY KQISSQSGAS NDNHYFGYST PWGYFDFNRF HCHFSPRDWQ RLINNNWGFR PKRLNFKLFN IQV KEVTQN DGTTTIANNL TSTVQVFTDS EYQLPYVLGS AHQGCLPPFP ADVFMVPQYG YLTLNNGSQA VGRSSFYCLE YFPS QMLRT GNNFTFSYTF EDVPFHSSYA HSQSLDALMN PLIDQYLYYL SRTNTPSGTT TQSRLQFSQA GASDIRDQSR NWLPG PCYR QQRVSKTSAD NNNSEYSWTG ATKYHLNGRD SLVNPGPAMA SHKDDEEKFF PQSGVLIFGK QGSEKTNVDI EKVMIT DEE EIRTTNPVAT EQYGSVSTNL QRGNRQAATA DVNTQGVLPG MVWQDRDVYL QGPIWAKIPH TDGHFHPSPL MGGFGLK HP PPQILIKNTP VPANPSTTFS AAKFASFITQ YSTGQVSVEI EWELQKENSK RWNPEIQYTS NYNKSVNVDF TVDTNGVY S EPRPIGTRYL TRNL UniProtKB: Capsid protein VP1 |
-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 | 1 mg/mL | ||||||||||||
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緩衝液 | pH: 7.4 構成要素:
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グリッド | モデル: Quantifoil R2/2 / 材質: COPPER / メッシュ: 200 / 支持フィルム - 材質: CARBON / 支持フィルム - トポロジー: HOLEY ARRAY / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 30 sec. | ||||||||||||
凍結 | 凍結剤: ETHANE / 装置: HOMEMADE PLUNGER 詳細: Grid was blotted for 5 seconds before plunge freezing.. |
-電子顕微鏡法
顕微鏡 | FEI POLARA 300 |
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温度 | 最低: 90.0 K / 最高: 97.0 K |
撮影 | フィルム・検出器のモデル: KODAK SO-163 FILM / 撮影したグリッド数: 1 / 実像数: 49 / 平均露光時間: 0.8 sec. / 平均電子線量: 20.0 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | C2レンズ絞り径: 70.0 µm / 倍率(補正後): 56924 / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 2.26 mm / 最大 デフォーカス(公称値): 3.2 µm / 最小 デフォーカス(公称値): 1.2 µm / 倍率(公称値): 59000 |
試料ステージ | 試料ホルダーモデル: OTHER / ホルダー冷却材: NITROGEN |
実験機器 | モデル: Tecnai Polara / 画像提供: FEI Company |