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基本情報
登録情報 | データベース: PDB / ID: 6tik | ||||||
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タイトル | Hepatitis B virus core shell--virus-like particle with NadA epitope | ||||||
![]() | Capsid protein,Putative adhesin/invasin,Capsid protein,Factor H-binding protein | ||||||
![]() | VIRUS LIKE PARTICLE / Virus-like particle / VLP / antigen / NadA / Neisseria meningitidis / HBV / HBC / factor H binding protein | ||||||
機能・相同性 | ![]() microtubule-dependent intracellular transport of viral material towards nucleus / T=4 icosahedral viral capsid / cell outer membrane / viral penetration into host nucleus / host cell / host cell cytoplasm / symbiont entry into host cell / viral envelope / structural molecule activity / cell surface ...microtubule-dependent intracellular transport of viral material towards nucleus / T=4 icosahedral viral capsid / cell outer membrane / viral penetration into host nucleus / host cell / host cell cytoplasm / symbiont entry into host cell / viral envelope / structural molecule activity / cell surface / DNA binding / RNA binding / membrane 類似検索 - 分子機能 | ||||||
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: 3.4 Å | ||||||
![]() | Roseman, A.M. / Colllins, R.F. / Derrick, J.P. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: An assessment of the use of Hepatitis B Virus core protein virus-like particles to display heterologous antigens from Neisseria meningitidis. 著者: Sebastian Aston-Deaville / Emil Carlsson / Muhammad Saleem / Angela Thistlethwaite / Hannah Chan / Sunil Maharjan / Alessandra Facchetti / Ian M Feavers / C Alistair Siebert / Richard F ...著者: Sebastian Aston-Deaville / Emil Carlsson / Muhammad Saleem / Angela Thistlethwaite / Hannah Chan / Sunil Maharjan / Alessandra Facchetti / Ian M Feavers / C Alistair Siebert / Richard F Collins / Alan Roseman / Jeremy P Derrick / ![]() 要旨: Neisseria meningitidis is the causative agent of meningococcal meningitis and sepsis and remains a significant public health problem in many countries. Efforts to develop a comprehensive vaccine ...Neisseria meningitidis is the causative agent of meningococcal meningitis and sepsis and remains a significant public health problem in many countries. Efforts to develop a comprehensive vaccine against serogroup B meningococci have focused on the use of surface-exposed outer membrane proteins. Here we report the use of virus-like particles derived from the core protein of Hepatitis B Virus, HBc, to incorporate antigen domains derived from Factor H binding protein (FHbp) and the adhesin NadA. The extracellular domain of NadA was inserted into the major immunodominant region of HBc, and the C-terminal domain of FHbp at the C-terminus (CFHbp), creating a single polypeptide chain 3.7-fold larger than native HBc. Remarkably, cryoelectron microscopy revealed that the construct formed assemblies that were able to incorporate both antigens with minimal structural changes to native HBc. Electron density was weak for NadA and absent for CFHbp, partly attributable to domain flexibility. Following immunization of mice, three HBc fusions (CFHbp or NadA alone, NadA + CFHbp) were able to induce production of IgG1, IgG2a and IgG2b antibodies reactive against their respective antigens at dilutions in excess of 1:18,000. However, only HBc fusions containing NadA elicited the production of antibodies with serum bactericidal activity. It is hypothesized that this improved immune response is attributable to the adoption of a more native-like folding of crucial conformational epitopes of NadA within the chimeric VLP. This work demonstrates that HBc can incorporate insertions of large antigen domains but that maintenance of their three-dimensional structure is likely to be critical in obtaining a protective response. | ||||||
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-検証レポート
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-関連構造データ
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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: 62116.750 Da / 分子数: 4 / 由来タイプ: 組換発現 詳細: HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria ...詳細: HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487).,HBcS-NadA-CFHbp VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487). 由来: (組換発現) ![]() ![]() ![]() 遺伝子: C, c, core, PreC, preC, nadA, gna1870, fhbp / 発現宿主: ![]() ![]() Has protein modification | Y | |
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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: VLP fusion sequence expressed in E.coli. / タイプ: COMPLEX 詳細: HBcS-NadA-CFHbp Fusion protein with linker regions. VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: ...詳細: HBcS-NadA-CFHbp Fusion protein with linker regions. VLP fusion sequence expressed in E.coli. HBc - core shell from hepatitis B virus NadA - Partially ordered surface displayed domain: extracellular domain of NadA from Neisseria meningitidis (NCBI taxonomy ID 487). CFHbp - Unresolved/disordered component : C-terminal domain of factor H binding protein from Neisseria meningitidis (NCBI taxonomy ID 487). Entity ID: all / 由来: RECOMBINANT | ||||||||||||
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分子量 | 値: 14.9 MDa / 実験値: NO | ||||||||||||
由来(天然) |
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由来(組換発現) | 生物種: ![]() ![]() | ||||||||||||
緩衝液 | pH: 8 / 詳細: PBS | ||||||||||||
試料 | 濃度: 1 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | ||||||||||||
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 R2/2 | ||||||||||||
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 90 % / 凍結前の試料温度: 295 K 詳細: 3 ul applied for 30s at room temperature, then 4 - 5 s blot |
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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: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 104167 X / 倍率(補正後): 100719 X / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 1000 nm / Calibrated defocus min: 424 nm / 最大 デフォーカス(補正後): 3840 nm / Cs: 2.7 mm / C2レンズ絞り径: 70 µm / アライメント法: BASIC |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 平均露光時間: 4 sec. / 電子線照射量: 79 e/Å2 / 検出モード: INTEGRATING フィルム・検出器のモデル: FEI FALCON III (4k x 4k) 撮影したグリッド数: 1 / 実像数: 2367 |
画像スキャン | サンプリングサイズ: 14 µm / 横: 4096 / 縦: 4096 |
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解析
ソフトウェア |
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EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 10119 詳細: Initially ~44,000 particles were initially picked and extracted in EMAN. Approx 12,000 were shell fragments or incomplete. Others were intact but lower resolution, so damaged or affected by ...詳細: Initially ~44,000 particles were initially picked and extracted in EMAN. Approx 12,000 were shell fragments or incomplete. Others were intact but lower resolution, so damaged or affected by charging, or other issue. After filtering/cleaning by EMAN2 2D classification 10119 particles were taken forwards for initial 3D reconstruction in EMAN2. This set of 10119 was then 2D cleaned by CryoSPARC to give 9145 particles. | ||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: I (正20面体型対称) | ||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 8598 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | B value: 111.33 / プロトコル: FLEXIBLE FIT / 空間: REAL / Target criteria: Correlation with the map plus geometry 詳細: The 4 protein chains from the original T=4 HBV core shell structure solved by X-ray crystallography (Wynne, Leslie, Crowther, 1999), PDB code 1QGT, representing two independently resolved ...詳細: The 4 protein chains from the original T=4 HBV core shell structure solved by X-ray crystallography (Wynne, Leslie, Crowther, 1999), PDB code 1QGT, representing two independently resolved dimeric spikes, were docked into the map using DockEM, and visualised in UCSF Chimera. Part of the chains near the tips of the spikes did not fit well to the map. This region of the map, corresponding to the major immune dominant region where the inserted NadA epitope was placed, was poorly resolved. Therefore the model region according to the native sequence between, but not including, Leu76 to Arg82 was deleted from all 4 chains. This model was then refined against the map with the phenix.real_space_refine program, using global minimisation, simulated annealing, B-factor refinement, and without non-crystallographic symmetry (NCS) restraints. Default parameters were used for other constraints. The resulting model was re-refined once using the local_grid_search option, with all other parameters left unchanged. | ||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 1QGT Accession code: 1QGT / Pdb chain residue range: 1-143 / Source name: PDB / タイプ: experimental model | ||||||||||||||||||||||||||||||||||||||||||||||||||
精密化 | 立体化学のターゲット値: GeoStd + Monomer Library | ||||||||||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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