National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
UM1 AI100663
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
P50 GM103368
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
P01 AI110657
米国
引用
ジャーナル: Nature / 年: 2017 タイトル: Open and closed structures reveal allostery and pliability in the HIV-1 envelope spike. 著者: Gabriel Ozorowski / Jesper Pallesen / Natalia de Val / Dmitry Lyumkis / Christopher A Cottrell / Jonathan L Torres / Jeffrey Copps / Robyn L Stanfield / Albert Cupo / Pavel Pugach / John P ...著者: Gabriel Ozorowski / Jesper Pallesen / Natalia de Val / Dmitry Lyumkis / Christopher A Cottrell / Jonathan L Torres / Jeffrey Copps / Robyn L Stanfield / Albert Cupo / Pavel Pugach / John P Moore / Ian A Wilson / Andrew B Ward / 要旨: For many enveloped viruses, binding to a receptor(s) on a host cell acts as the first step in a series of events culminating in fusion with the host cell membrane and transfer of genetic material for ...For many enveloped viruses, binding to a receptor(s) on a host cell acts as the first step in a series of events culminating in fusion with the host cell membrane and transfer of genetic material for replication. The envelope glycoprotein (Env) trimer on the surface of HIV is responsible for receptor binding and fusion. Although Env can tolerate a high degree of mutation in five variable regions (V1-V5), and also at N-linked glycosylation sites that contribute roughly half the mass of Env, the functional sites for recognition of receptor CD4 and co-receptor CXCR4/CCR5 are conserved and essential for viral fitness. Soluble SOSIP Env trimers are structural and antigenic mimics of the pre-fusion native, surface-presented Env, and are targets of broadly neutralizing antibodies. Thus, they are attractive immunogens for vaccine development. Here we present high-resolution cryo-electron microscopy structures of subtype B B41 SOSIP Env trimers in complex with CD4 and antibody 17b, or with antibody b12, at resolutions of 3.7 Å and 3.6 Å, respectively. We compare these to cryo-electron microscopy reconstructions of B41 SOSIP Env trimers with no ligand or in complex with either CD4 or the CD4-binding-site antibody PGV04 at 5.6 Å, 5.2 Å and 7.4 Å resolution, respectively. Consequently, we present the most complete description yet, to our knowledge, of the CD4-17b-induced intermediate and provide the molecular basis of the receptor-binding-induced conformational change required for HIV-1 entry into host cells. Both CD4 and b12 induce large, previously uncharacterized conformational rearrangements in the gp41 subunits, and the fusion peptide becomes buried in a newly formed pocket. These structures provide key details on the biological function of the type I viral fusion machine from HIV-1 as well as new templates for inhibitor design.
タンパク質・ペプチド: broadly neutralizing antibody (Fab) 17b heavy chain
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超分子 #1: HIV-1 Env BG505 SOSIP.664 in complex with soluble CD4 (2-domain) ...
超分子
名称: HIV-1 Env BG505 SOSIP.664 in complex with soluble CD4 (2-domain) and Fab domain of neutralizing 17b antibody タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all
凍結剤: ETHANE / チャンバー内湿度: 50 % / チャンバー内温度: 277 K / 装置: HOMEMADE PLUNGER 詳細: 5 microliters of the complex was incubated with 3 microliters of a fresh 1.8 mM DDM solution. A 3 microliter aliquot of the complex was applied to a C-Flat grid (CF-2/2-4C, Electron ...詳細: 5 microliters of the complex was incubated with 3 microliters of a fresh 1.8 mM DDM solution. A 3 microliter aliquot of the complex was applied to a C-Flat grid (CF-2/2-4C, Electron Microscopy Sciences, Protochips, Inc.) which had been plasma cleaned for 5 seconds using a mixture of Ar/O2 (Gatan Solarus 950 Plasma system), blotted off, and then immediately plunged into liquid ethane using a manual freeze plunger..
ソフトウェア - 名称: CTFFIND (ver. 3) / 詳細: performed internally in Relion and Frealign
初期モデル
モデルのタイプ: INSILICO MODEL / In silico モデル: common lines model using OptiMod 詳細: An initial model was generated directly from the class averages using OptiMod.
最終 再構成
想定した対称性 - 点群: C3 (3回回転対称) / アルゴリズム: FOURIER SPACE / 解像度のタイプ: BY AUTHOR / 解像度: 8.6 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: FREALIGN (ver. 9.11) / 詳細: Resolution-limited refinement used throughout / 使用した粒子像数: 5716