+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 7u95 | ||||||
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タイトル | SAAV pH 6.0 capsid structure | ||||||
要素 | Capsid protein | ||||||
キーワード | VIRUS LIKE PARTICLE / Capsid / AAV / gene therapy / receptor / endosomal trafficking / antigenicity | ||||||
機能・相同性 | Phospholipase A2-like domain / Phospholipase A2-like domain / Parvovirus coat protein VP2 / Parvovirus coat protein VP1/VP2 / Parvovirus coat protein VP2 / Capsid/spike protein, ssDNA virus / T=1 icosahedral viral capsid / structural molecule activity / Capsid protein 機能・相同性情報 | ||||||
生物種 | Snake adeno-associated virus (アデノ随伴ウイルス) | ||||||
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: 2.73 Å | ||||||
データ登録者 | Mietzsch, M. / McKenna, R. | ||||||
資金援助 | 米国, 1件
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引用 | ジャーナル: J Virol / 年: 2022 タイトル: Characterization of the Serpentine Adeno-Associated Virus (SAAV) Capsid Structure: Receptor Interactions and Antigenicity. 著者: Mario Mietzsch / Joshua A Hull / Victoria E Makal / Alberto Jimenez Ybargollin / Jennifer C Yu / Kedrick McKissock / Antonette Bennett / Judit Penzes / Bridget Lins-Austin / Qian Yu / Paul ...著者: Mario Mietzsch / Joshua A Hull / Victoria E Makal / Alberto Jimenez Ybargollin / Jennifer C Yu / Kedrick McKissock / Antonette Bennett / Judit Penzes / Bridget Lins-Austin / Qian Yu / Paul Chipman / Nilakshee Bhattacharya / Duncan Sousa / David Strugatsky / Peter Tijssen / Robert McKenna / Mavis Agbandje-McKenna / 要旨: Adeno-associated viruses (AAVs) are being developed as clinical gene therapy vectors. One issue undermining their broad use in the clinical setting is the high prevalence of circulating antibodies in ...Adeno-associated viruses (AAVs) are being developed as clinical gene therapy vectors. One issue undermining their broad use in the clinical setting is the high prevalence of circulating antibodies in the general population capable of neutralizing AAV vectors. Hence, there is a need for AAV vectors that can evade the preexisting immune response. One possible source of human naive vectors are AAVs that do not disseminate in the primate population, and one such example is serpentine AAV (SAAV). This study characterizes the structural and biophysical properties of the SAAV capsid and its receptor interactions and antigenicity. Single particle cryo-electron microscopy (cryo-EM) and thermal stability studies were conducted to characterize the SAAV capsid structure at pH 7.4, 6.0, 5.5, and 4.0, conditions experienced during cellular trafficking. Cell binding assays using Chinese hamster ovary (CHO) cell lines identified terminal sialic acid as the primary attachment receptor for SAAV similar to AAV1, 4, 5, and 6. The binding site of sialic acid to the SAAV capsid was mapped near the 2-fold axis toward the 2/5-fold wall, in a different location than AAV1, 4, 5, and 6. Towards determining the SAAV capsid antigenicity native immunodot blots showed that SAAV evades AAV serotype-specific mouse monoclonal antibodies. However, despite its reptilian origin, it was recognized by ~25% of 50 human sera tested, likely due to the presence of cross-reactive antibodies. These findings will inform future gene delivery applications using SAAV-based vectors and further aid the structural characterization and annotation of the repertoire of available AAV capsids. AAVs are widely studied therapeutic gene delivery vectors. However, preexisting antibodies and their detrimental effect on therapeutic efficacy are a primary challenge encountered during clinical trials. In order to circumvent preexisting neutralizing antibodies targeting mammalian AAV capsids, serpentine AAV (SAAV) was evaluated as a potential alternative to existing mammalian therapeutic vectors. The SAAV capsid was found to be thermostable at a wide range of environmental pH conditions, and its structure showed conservation of the core capsid topology but displays high structural variability on the surface. At the same time, it binds to a common receptor, sialic acid, that is also utilized by other AAVs already being utilized in gene therapy trials. Contrary to the initial hypothesis, SAAV capsids were recognized by one in four human sera tested, pointing to conserved amino acids around the 5-fold region as epitopes for cross-reacting antibodies. | ||||||
履歴 |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 7u95.cif.gz | 5 MB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb7u95.ent.gz | 表示 | PDB形式 | |
PDBx/mmJSON形式 | 7u95.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 | 7u95_validation.pdf.gz | 1.4 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 7u95_full_validation.pdf.gz | 1.4 MB | 表示 | |
XML形式データ | 7u95_validation.xml.gz | 621.4 KB | 表示 | |
CIF形式データ | 7u95_validation.cif.gz | 1013.9 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/u9/7u95 ftp://data.pdbj.org/pub/pdb/validation_reports/u9/7u95 | 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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1 |
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-要素
#1: タンパク質 | 分子量: 57217.203 Da / 分子数: 60 / 断片: UNP residues 206-726 / 由来タイプ: 組換発現 由来: (組換発現) Snake adeno-associated virus (アデノ随伴ウイルス) 遺伝子: VP1 発現宿主: Spodoptera frugiperda (ツマジロクサヨトウ) 参照: UniProt: Q6V7U2 |
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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: Snake adeno-associated virus / タイプ: VIRUS / Entity ID: all / 由来: RECOMBINANT |
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由来(天然) | 生物種: Snake adeno-associated virus (アデノ随伴ウイルス) |
由来(組換発現) | 生物種: Spodoptera frugiperda (ツマジロクサヨトウ) |
ウイルスについての詳細 | 中空か: YES / エンベロープを持つか: NO / 単離: OTHER / タイプ: VIRUS-LIKE PARTICLE |
緩衝液 | pH: 6 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
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 / 最大 デフォーカス(公称値): 3000 nm / 最小 デフォーカス(公称値): 1000 nm / Cs: 2.7 mm |
撮影 | 電子線照射量: 60 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
-解析
ソフトウェア | 名称: PHENIX / バージョン: 1.10-2155_2155: / 分類: 精密化 | ||||||||||||||||||||||||
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EMソフトウェア | 名称: cisTEM / カテゴリ: 3次元再構成 | ||||||||||||||||||||||||
CTF補正 | タイプ: NONE | ||||||||||||||||||||||||
3次元再構成 | 解像度: 2.73 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 55586 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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