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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: 3j7e | ||||||
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タイトル | Electron cryo-microscopy of human papillomavirus 16 and H16.V5 Fab fragments | ||||||
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機能・相同性 | ![]() Immunoglobulin V-Type / ![]() ![]() ![]() 類似検索 - ドメイン・相同性 | ||||||
生物種 | ![]() ![]() ![]() | ||||||
手法 | ![]() ![]() ![]() | ||||||
![]() | Lee, H. / Brendle, S.A. / Bywaters, S.M. / Christensen, N.D. / Hafenstein, S. | ||||||
![]() | ![]() タイトル: A cryo-electron microscopy study identifies the complete H16.V5 epitope and reveals global conformational changes initiated by binding of the neutralizing antibody fragment. 著者: Hyunwook Lee / Sarah A Brendle / Stephanie M Bywaters / Jian Guan / Robert E Ashley / Joshua D Yoder / Alexander M Makhov / James F Conway / Neil D Christensen / Susan Hafenstein / ![]() 要旨: Human papillomavirus 16 (HPV16) is a worldwide health threat and an etiologic agent of cervical cancer. To understand the antigenic properties of HPV16, we pursued a structural study to elucidate HPV ...Human papillomavirus 16 (HPV16) is a worldwide health threat and an etiologic agent of cervical cancer. To understand the antigenic properties of HPV16, we pursued a structural study to elucidate HPV capsids and antibody interactions. The cryo-electron microscopy (cryo-EM) structures of a mature HPV16 particle and an altered capsid particle were solved individually and as complexes with fragment of antibody (Fab) from the neutralizing antibody H16.V5. Fitted crystal structures provided a pseudoatomic model of the virus-Fab complex, which identified a precise footprint of H16.V5, including previously unrecognized residues. The altered-capsid-Fab complex map showed that binding of the Fab induced significant conformational changes that were not seen in the altered-capsid structure alone. These changes included more ordered surface loops, consolidated so-called "invading-arm" structures, and tighter intercapsomeric connections at the capsid floor. The H16.V5 Fab preferentially bound hexavalent capsomers likely with a stabilizing effect that directly correlated with the number of bound Fabs. Additional cryo-EM reconstructions of the virus-Fab complex for different incubation times and structural analysis provide a model for a hyperstabilization of the capsomer by H16.V5 Fab and showed that the Fab distinguishes subtle differences between antigenic sites. IMPORTANCE: Our analysis of the cryo-EM reconstructions of the HPV16 capsids and virus-Fab complexes has identified the entire HPV.V5 conformational epitope and demonstrated a detailed neutralization ...IMPORTANCE: Our analysis of the cryo-EM reconstructions of the HPV16 capsids and virus-Fab complexes has identified the entire HPV.V5 conformational epitope and demonstrated a detailed neutralization mechanism of this clinically important monoclonal antibody against HPV16. The Fab bound and ordered the apical loops of HPV16. This conformational change was transmitted to the lower region of the capsomer, resulting in enhanced intercapsomeric interactions evidenced by the more ordered capsid floor and "invading-arm" structures. This study advances the understanding of the neutralization mechanism used by H16.V5. | ||||||
履歴 |
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構造の表示
ムービー |
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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 | ![]() | 165.3 KB | 表示 | ![]() |
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PDB形式 | ![]() | 133.6 KB | 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
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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![]() ![]() |
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要素
#1: 抗体 | 分子量: 12623.161 Da / 分子数: 4 / 断片: variable domain / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() ![]() #2: 抗体 | 分子量: 13497.968 Da / 分子数: 4 / 断片: variable domain / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() ![]() |
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-実験情報
-実験
実験 | 手法: ![]() |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: ![]() |
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試料調製
構成要素 |
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分子量 | 値: 42 MDa / 実験値: NO | ||||||||||||||||||||
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 / ホストのカテゴリ: VERTEBRATES / 単離: OTHER / タイプ: VIRION | ||||||||||||||||||||
天然宿主 | 生物種: Homo sapiens | ||||||||||||||||||||
緩衝液 | 名称: 137 mM NaCl, 2.7 mM KCl, 10 mM Na2HPO4, 1.8 mM KH2PO4 pH: 7.4 詳細: 137 mM NaCl, 2.7 mM KCl, 10 mM Na2HPO4, 1.8 mM KH2PO4 | ||||||||||||||||||||
試料 | 濃度: 1 mg/ml / 包埋: NO / シャドウイング: NO / 染色![]() ![]() | ||||||||||||||||||||
試料支持 | 詳細: glow-discharged holey carbon Quantifoil grids | ||||||||||||||||||||
急速凍結![]() | 装置: GATAN CRYOPLUNGE 3 / 凍結剤: ETHANE / Temp: 102 K / 湿度: 90 % 詳細: Blot for 0.7 seconds before plunging into liquid ethane (GATAN CRYOPLUNGE 3). 手法: Blot for 0.7 seconds before plunging |
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電子顕微鏡撮影
顕微鏡 | モデル: JEOL 2100 / 日付: 2013年10月30日 |
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電子銃 | 電子線源![]() |
電子レンズ | モード: BRIGHT FIELD![]() ![]() |
試料ホルダ | 試料ホルダーモデル: GATAN LIQUID NITROGEN / 温度: 95 K / 傾斜角・最大: 0 ° / 傾斜角・最小: 0 ° |
撮影 | 電子線照射量: 15 e/Å2 フィルム・検出器のモデル: GATAN ULTRASCAN 4000 (4k x 4k) |
画像スキャン | デジタル画像の数: 411 |
放射 | プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray |
放射波長 | 相対比: 1 |
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解析
EMソフトウェア |
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CTF補正![]() | 詳細: Each particle | ||||||||||||||||||||
対称性 | 点対称性![]() ![]() | ||||||||||||||||||||
3次元再構成![]() | 手法: Cross-common lines / 解像度: 13.6 Å / 解像度の算出法: FSC 0.5 CUT-OFF / 粒子像の数: 2075 / ピクセルサイズ(公称値): 1.48 Å / ピクセルサイズ(実測値): 1.48 Å 詳細: Semi-automatic particle selection was performed using e2boxer.py to obtain the particle coordinates, followed by particle boxing, linearization, normalization, and apodization of the images ...詳細: Semi-automatic particle selection was performed using e2boxer.py to obtain the particle coordinates, followed by particle boxing, linearization, normalization, and apodization of the images using Robem. Defocus and astigmatism values to perform contrast transfer function (CTF) correction were assessed using Robem for the extracted particles. The icosahedrally averaged reconstructions were initiated using a random model generated with setup_rmc and reached 14 A resolution estimated at a Fourier Shell Correlation (FSC) of 0.5. For the last step of refinement, the final maps were CTF-corrected using a B factor of 200 A2. (Single particle--Applied symmetry: I) 対称性のタイプ: POINT | ||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL / 詳細: REFINEMENT PROTOCOL--flexible | ||||||||||||||||||||
精密化ステップ | サイクル: LAST
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