ジャーナル: Nat Struct Mol Biol / 年: 2015 タイトル: Structure-based energetics of protein interfaces guides foot-and-mouth disease virus vaccine design. 著者: Abhay Kotecha / Julian Seago / Katherine Scott / Alison Burman / Silvia Loureiro / Jingshan Ren / Claudine Porta / Helen M Ginn / Terry Jackson / Eva Perez-Martin / C Alistair Siebert / ...著者: Abhay Kotecha / Julian Seago / Katherine Scott / Alison Burman / Silvia Loureiro / Jingshan Ren / Claudine Porta / Helen M Ginn / Terry Jackson / Eva Perez-Martin / C Alistair Siebert / Guntram Paul / Juha T Huiskonen / Ian M Jones / Robert M Esnouf / Elizabeth E Fry / Francois F Maree / Bryan Charleston / David I Stuart / 要旨: Virus capsids are primed for disassembly, yet capsid integrity is key to generating a protective immune response. Foot-and-mouth disease virus (FMDV) capsids comprise identical pentameric protein ...Virus capsids are primed for disassembly, yet capsid integrity is key to generating a protective immune response. Foot-and-mouth disease virus (FMDV) capsids comprise identical pentameric protein subunits held together by tenuous noncovalent interactions and are often unstable. Chemically inactivated or recombinant empty capsids, which could form the basis of future vaccines, are even less stable than live virus. Here we devised a computational method to assess the relative stability of protein-protein interfaces and used it to design improved candidate vaccines for two poorly stable, but globally important, serotypes of FMDV: O and SAT2. We used a restrained molecular dynamics strategy to rank mutations predicted to strengthen the pentamer interfaces and applied the results to produce stabilized capsids. Structural analyses and stability assays confirmed the predictions, and vaccinated animals generated improved neutralizing-antibody responses to stabilized particles compared to parental viruses and wild-type capsids.
詳細: C-flat 2/1 2C 200 mesh, glow discharged in atmosphere
凍結
凍結剤: ETHANE / チャンバー内湿度: 70 % / チャンバー内温度: 120 K / 装置: FEI VITROBOT MARK IV / 手法: Blot for 3 seconds before plunging
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電子顕微鏡法
顕微鏡
FEI POLARA 300
温度
最低: 80 K / 最高: 110 K
特殊光学系
エネルギーフィルター - 名称: GIF Quantum エネルギーフィルター - エネルギー下限: 0.0 eV エネルギーフィルター - エネルギー上限: 20.0 eV
日付
2014年5月11日
撮影
カテゴリ: CCD / フィルム・検出器のモデル: GATAN K2 (4k x 4k) / デジタル化 - サンプリング間隔: 5 µm / 実像数: 628 / 平均電子線量: 25 e/Å2 詳細: Every image is the average of 25 frames recorded by the direct electron detector ビット/ピクセル: 16
The particles were picked using semi-automatic selection.
CTF補正
詳細: Each particle
最終 再構成
想定した対称性 - 点群: I (正20面体型対称) / アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 3.5 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: Relion 詳細: Final map was postprocessed in Relion and sharpened using B-factor of -121 使用した粒子像数: 8156