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基本情報
登録情報 | データベース: PDB / ID: 6vfk | ||||||
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タイトル | De novo designed tetrahedral nanoparticle T33_dn10 displaying 4 copies of BG505-SOSIP trimer on the surface | ||||||
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![]() | DE NOVO PROTEIN / Nanoparticle / Rosetta / De novo protein design / HIV Env | ||||||
生物種 | synthetic construct (人工物) | ||||||
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: 4.25 Å | ||||||
![]() | Antanasijevic, A. / Ward, A.B. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural and functional evaluation of de novo-designed, two-component nanoparticle carriers for HIV Env trimer immunogens. 著者: Aleksandar Antanasijevic / George Ueda / Philip J M Brouwer / Jeffrey Copps / Deli Huang / Joel D Allen / Christopher A Cottrell / Anila Yasmeen / Leigh M Sewall / Ilja Bontjer / Thomas J ...著者: Aleksandar Antanasijevic / George Ueda / Philip J M Brouwer / Jeffrey Copps / Deli Huang / Joel D Allen / Christopher A Cottrell / Anila Yasmeen / Leigh M Sewall / Ilja Bontjer / Thomas J Ketas / Hannah L Turner / Zachary T Berndsen / David C Montefiori / Per Johan Klasse / Max Crispin / David Nemazee / John P Moore / Rogier W Sanders / Neil P King / David Baker / Andrew B Ward / ![]() ![]() ![]() 要旨: Two-component, self-assembling nanoparticles represent a versatile platform for multivalent presentation of viral antigens. Computational design of protein nanoparticles with differing sizes and ...Two-component, self-assembling nanoparticles represent a versatile platform for multivalent presentation of viral antigens. Computational design of protein nanoparticles with differing sizes and geometries enables combination with antigens of choice to test novel multimerization concepts in immunization strategies where the goal is to improve the induction and maturation of neutralizing antibody lineages. Here, we describe detailed antigenic, structural, and functional characterization of computationally designed tetrahedral, octahedral, and icosahedral nanoparticle immunogens displaying trimeric HIV envelope glycoprotein (Env) ectodomains. Env trimers, based on subtype A (BG505) or consensus group M (ConM) sequences and engineered with SOSIP stabilizing mutations, were fused to an underlying trimeric building block of each nanoparticle. Initial screening yielded one icosahedral and two tetrahedral nanoparticle candidates, capable of presenting twenty or four copies of the Env trimer. A number of analyses, including detailed structural characterization by cryo-EM, demonstrated that the nanoparticle immunogens possessed the intended structural and antigenic properties. When the immunogenicity of ConM-SOSIP trimers presented on a two-component tetrahedral nanoparticle or as soluble proteins were compared in rabbits, the two immunogens elicited similar serum antibody binding titers against the trimer component. Neutralizing antibody titers were slightly elevated in the animals given the nanoparticle immunogen and were initially more focused to the trimer apex. Altogether, our findings indicate that tetrahedral nanoparticles can be successfully applied for presentation of HIV Env trimer immunogens; however, the optimal implementation to different immunization strategies remains to be determined. | ||||||
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構造の表示
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構造ビューア | 分子: ![]() ![]() |
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-検証レポート
文書・要旨 | ![]() | 1.2 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.2 MB | 表示 | |
XML形式データ | ![]() | 32.9 KB | 表示 | |
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-関連構造データ
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リンク
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集合体
登録構造単位 | ![]()
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対称性 | 点対称性: (シェーンフリース記号: T (正4面体型対称)) |
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要素
#1: タンパク質 | 分子量: 31466.830 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) synthetic construct (人工物) / プラスミド: pET28b / 発現宿主: ![]() ![]() |
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#2: タンパク質 | 分子量: 88855.289 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) synthetic construct (人工物) / プラスミド: pPPI4 / 細胞株 (発現宿主): HEK293F / 発現宿主: ![]() |
-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: De novo designed tetrahedral nanoparticle T33_dn10 displaying 4 copies of BG505-SOSIP trimer on the surface. Nanoparticle consists of 12 copies of both subunits (BG505-SOSIP-T33_dn10A and T33_dn10B) タイプ: COMPLEX 詳細: Nanoparticle is assembled by combining equimolar amounts of BG505-SOSIP-T33_dn10A and T33_dn10B and subsequent incubation. Nanoparticle is purified from unassembled components by SEC Entity ID: all / 由来: RECOMBINANT | |||||||||||||||
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分子量 | 単位: MEGADALTONS / 実験値: NO | |||||||||||||||
由来(天然) | 生物種: synthetic construct (人工物) | |||||||||||||||
由来(組換発現) | 生物種: ![]() | |||||||||||||||
緩衝液 | pH: 7.4 / 詳細: TBS buffer, pH 7.4 | |||||||||||||||
緩衝液成分 |
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試料 | 濃度: 1.6 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Nanoparticle is assembled by combining equimolar amounts of BG505-SOSIP-T33_dn10A and T33_dn10B and subsequent incubation. Nanoparticle is purified from unassembled components by SEC. Sample ...詳細: Nanoparticle is assembled by combining equimolar amounts of BG505-SOSIP-T33_dn10A and T33_dn10B and subsequent incubation. Nanoparticle is purified from unassembled components by SEC. Sample is then concentrated to 1.6mg/ml in TBS buffer. | |||||||||||||||
試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 400 divisions/in. / グリッドのタイプ: Quantifoil R2/1 | |||||||||||||||
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 283 K 詳細: Blotting time varied in the 3-7 s range, Blotting force set to 0, Wait time of 10s. |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Talos Arctica / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TALOS ARCTICA |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 36000 X / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 600 nm / Cs: 2.7 mm / C2レンズ絞り径: 70 µm / アライメント法: COMA FREE |
試料ホルダ | 凍結剤: NITROGEN / 試料ホルダーモデル: OTHER |
撮影 | 平均露光時間: 11.25 sec. / 電子線照射量: 49.39 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 撮影したグリッド数: 1 / 実像数: 798 |
画像スキャン | 動画フレーム数/画像: 45 |
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解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING ONLY | ||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 25791 / 詳細: Template picking in cryoSPARC | ||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: T (正4面体型対称) | ||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 4.25 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 81105 / アルゴリズム: BACK PROJECTION / クラス平均像の数: 1 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: RIGID BODY FIT / 空間: REAL 詳細: Model refinement was performed by iterative rounds of Rosetta relaxed refinement and manual refinement in Coot. |