ジャーナル: Hum Gene Ther / 年: 2022 タイトル: Cellular and Structural Characterization of VP1 and VP2 Knockout Mutants of AAV3B Serotype and Implications for AAV Manufacturing. 著者: Iker Arriaga / Aitor Navarro / Amaia Etxabe / César Trigueros / R Jude Samulski / Philippe Moullier / Achille François / Nicola G A Abrescia / 要旨: AAV virion biology is still lacking a complete understanding of the role that the various structural subunits (VP1, 2, and 3) play in virus assembly, infectivity, and therapeutic delivery for ...AAV virion biology is still lacking a complete understanding of the role that the various structural subunits (VP1, 2, and 3) play in virus assembly, infectivity, and therapeutic delivery for clinical indications. In this study, we focus on the less studied adeno-associated virus AAV3B and generate a collection of AAV plasmid substrates that assemble virion particles deficient specifically in VP1, VP2, or VP1 and 2 structural subunits. Using a collection of biological and structural assays, we observed that virions devoid of VP1, VP2, or VP1 and 2 efficiently assembled virion particles, indistinguishable by cryoelectron microscopy (cryo-EM) from that of wild type (WT), but unique in virion transduction (WT > VP2 > VP1 > VP1 and 2 mutants). We also observed that the missing structural subunit was mostly compensated by additional VP3 protomers in the formed virion particle. Using cryo-EM analysis, virions fell into three classes, namely full, empty, and partially filled, based on comparison of density values within the capsid. Further, we characterize virions described as "broken" or "disassembled" particles, and provide structural information that supports the particle dissolution occurring through the two-fold symmetry sites. Finally, we highlight the unique value of employing cryo-EM as an essential tool for release criteria with respect to AAV manufacturing.
凍結剤: ETHANE / チャンバー内湿度: 85 % / チャンバー内温度: 283 K / 装置: FEI VITROBOT MARK III 詳細: Parameters: 2 seconds of blot time, -2 offset value, after 45 seconds of incubation. Quantifoil Cu 300-mesh R1.2/1.3 holey-carbon grids with an extra layer of carbon on top added in-house..
詳細
9.40E+12 vg/ml
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電子顕微鏡法
顕微鏡
TFS GLACIOS
撮影
フィルム・検出器のモデル: FEI FALCON III (4k x 4k) 実像数: 2384 / 平均電子線量: 50.0 e/Å2