Biotechnology and Biological Sciences Research Council
BRIC PhD, BBSRC Reference BB/K02034X/1
英国
引用
ジャーナル: Vaccine / 年: 2020 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.
名称: VLP fusion sequence expressed in E.coli. / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: HBcS-NadA-CFHbp Fusion protein with linker regions. HBc - Ordered core of VLP: from HBV core protein (NCBI taxonomy ID 10407). NadA - Partially ordered surface displayed domain: extracellular ...詳細: HBcS-NadA-CFHbp Fusion protein with linker regions. HBc - Ordered core of VLP: from HBV core protein (NCBI taxonomy ID 10407). 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).
選択した数: 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.
CTF補正
ソフトウェア - 名称: EMAN2 (ver. 2.01) / ソフトウェア - 詳細: then CTF applied by CryoSPARC
最終 再構成
想定した対称性 - 点群: I (正20面体型対称) / 解像度のタイプ: BY AUTHOR / 解像度: 3.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: cryoSPARC (ver. v0.65) / 使用した粒子像数: 8598
初期 角度割当
タイプ: OTHER / ソフトウェア - 名称: cryoSPARC (ver. v0.65)
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. v0.65)