Structure and immune recognition of trimeric pre-fusion HIV-1 Env.

Structure and immune recognition of trimeric pre-fusion HIV-1 Env.
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DOI:
10.1038/nature13808
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发表时间:
2014-10-23
期刊:
影响因子:
64.8
通讯作者:
Kwong, Peter D.
Kwong, Peter D.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Pancera, Marie;Zhou, Tongqing;Druz, Aliaksandr;Georgiev, Ivelin S.;Soto, Cinque;Gorman, Jason;Huang, Jinghe;Acharya, Priyamvada;Chuang, Gwo-Yu;Ofek, Gilad;Stewart-Jones, Guillaume B. E.;Stuckey, Jonathan;Bailer, Robert T.;Joyce, M. Gordon;Louder, Mark K.;Tumba, Nancy;Yang, Yongping;Zhang, Baoshan;Cohen, Myron S.;Haynes, Barton F.;Mascola, John R.;Morris, Lynn;Munro, James B.;Blanchard, Scott C.;Mothes, Walther;Connors, Mark;Kwong, Peter D.

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HIV-1 包膜 (Env) 刺突由三个 gp120 和三个 gp41 亚基组成,是一种构象机器,可通过受体结合中间体从成熟的未配体状态重排至融合后状态,从而促进 HIV-1 进入。作为 HIV-1 病毒颗粒表面的唯一病毒抗原,Env 既是中和抗体的目标,也是疫苗工作的重点。在这里,我们报告了抗体 PGT122 和 35O22 在成熟闭合状态下捕获的 HIV-1-Env 三聚体的 3.5-Å 分辨率结构。该结构揭示了 gp41 的融合前构象,表明融合激活所需的重排,并定义了免疫逃避和免疫识别的参数。融合前 gp41 用四个螺旋包围 gp120 的 N 端和 C 端链,形成近端膜环,通过将融合肽-近端蛋氨酸插入 gp41-色氨酸扣来固定。进入所需的尖峰重新排列可能涉及打开扣子并排出末端。 N联糖基化和序列可变区域覆盖了融合前闭合尖峰:我们使用慢性队列来绘制有效HIV-1中和反应的流行率和位置,这些反应的特点是对N联聚糖的识别和对表位序列变异的耐受性。
The HIV-1-envelope (Env) spike, comprising three gp120 and three gp41 subunits, is a conformational machine that facilitates HIV-1 entry by rearranging from a mature unliganded state, through receptor-bound intermediates, to a postfusion state. As the sole viral antigen on the HIV-1-virion surface, Env is both the target of neutralizing antibodies and a focus of vaccine efforts. Here we report the structure at 3.5-Å resolution for an HIV-1-Env trimer captured in a mature closed state by antibodies PGT122 and 35O22. This structure reveals the prefusion conformation of gp41, indicates rearrangements needed for fusion activation, and defines parameters of immune evasion and immune recognition. Prefusion gp41 encircles N- and C-terminal strands of gp120 with four helices that form a membrane-proximal collar, fastened by insertion of a fusion peptide-proximal methionine into a gp41-tryptophan clasp. Spike rearrangements required for entry likely involve opening the clasp and expelling the termini. N-linked glycosylation and sequence-variable regions cover the prefusion closed spike: we used chronic cohorts to map the prevalence and location of effective HIV-1-neutralizing responses, which were distinguished by their recognition of N-linked glycan and tolerance for epitope-sequence variation.
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