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データを開く
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基本情報
登録情報 | データベース: PDB / ID: 9dcb | ||||||
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タイトル | The Structure of AAV5 at 4 Degrees | ||||||
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![]() | VIRUS / temperature / genome / vector / icosahedron | ||||||
機能・相同性 | ![]() | ||||||
生物種 | ![]() | ||||||
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: 2.89 Å | ||||||
![]() | Bennett, A.B. / McKenna, R. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Biophysical and structural insights into AAV genome ejection. 著者: Keely Gliwa / Joshua Hull / Austin Kansol / Victoria Zembruski / Renuk Lakshmanan / Mario Mietzsch / Paul Chipman / Antonette Bennett / Robert McKenna / ![]() 要旨: Recombinant adeno-associated virus (rAAV) is comprised of non-enveloped capsids that can package a therapeutic transgene and are currently being developed and utilized as gene therapy vectors. The ...Recombinant adeno-associated virus (rAAV) is comprised of non-enveloped capsids that can package a therapeutic transgene and are currently being developed and utilized as gene therapy vectors. The therapeutic efficiency of rAAV is dependent on successful cytoplasmic trafficking and transgene delivery to the nucleus. It is hypothesized that an increased understanding of the effects of the cellular environment and biophysical properties of the capsid as it traffics to the nucleus could provide insight to improve vector efficiency. The AAV capsid is exposed to increasing [H] during endo-lysosomal trafficking. Exposure to low pH facilitates the externalization of the viral protein 1 unique region (VP1u). This VP1u contains a phospholipase A2 domain required for endosomal escape and nuclear localization signals that facilitate nuclear targeting and entry. The viral genome is released either after total capsid disassembly or via a concerted DNA ejection mechanism in the nucleus. This study presents the characterization of genome ejection (GE) for two diverse serotypes, AAV2 and AAV5, using temperature. The temperature required to disassemble the virus capsid (T) is significantly higher than the temperature required to expose the transgene (T) for both serotypes. This was verified by quantitative PCR (qPCR) and transmission electron microscopy. Additionally, the absence of VP1/VP2 in the capsids and a decrease in pH increase the temperature of GE. Furthermore, cryo-electron microscopy structures of the AAV5 capsid pre- and post-GE reveal dynamics at the twofold, threefold, and fivefold regions of the capsid interior consistent with a concerted egress of the viral genome.IMPORTANCEThe development of recombinant adeno-associated virus (rAAV) capsids has grown rapidly in recent years, with five of the eight established therapeutics gaining approval in the past 2 years alone. Clinical progression with AAV2 and AAV5 represents a growing need to further characterize the molecular biology of these viruses. The goal of AAV-based gene therapy is to treat monogenic disorders with a vector-delivered transgene to provide wild-type protein function. A better understanding of the dynamics and conditions enabling transgene release may improve therapeutic efficiency. In addition to their clinical importance, AAV2 and 5 were chosen in this study for their diverse antigenic and biophysical properties compared to more closely related serotypes. Characterization of a shared genome ejection process may imply a conserved mechanism for all rAAV therapies. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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ダウンロード
PDBx/mmCIF形式 | ![]() | 5.8 MB | 表示 | ![]() |
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PDB形式 | ![]() | 表示 | ![]() | |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 46748MC ![]() 9dc7C ![]() 9dccC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 80497.414 Da / 分子数: 60 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: cap, VP1 発現宿主: ![]() ![]() 参照: UniProt: Q9YIJ1 #2: DNA鎖 | 分子量: 581.456 Da / 分子数: 60 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 発現宿主: ![]() ![]() 研究の焦点であるリガンドがあるか | N | Has protein modification | N | |
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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 |
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試料調製
構成要素 | 名称: adeno-associated virus 5 / タイプ: VIRUS / 詳細: Baculovirus expression / Entity ID: all / 由来: RECOMBINANT |
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分子量 | 値: 4 MDa / 実験値: NO |
由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
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: SEROTYPE / タイプ: VIRION |
緩衝液 | pH: 7.4 詳細: 10 mM Na2HPO4, 2 mM KH2PO4, 135 mM NaCl, 5 mM KCl, 1 mM MgCl2, pH 7.4 |
緩衝液成分 | 濃度: 1 mM / 名称: TD / 式: PBS-MK |
試料 | 濃度: 0.5 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 95 % |
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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: TFS KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 3967 nm / 最小 デフォーカス(公称値): 1289 nm |
撮影 | 電子線照射量: 45 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) |
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解析
EMソフトウェア | 名称: PHENIX / バージョン: 1.10-2155_2155: / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 2.89 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 23000 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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