Cryo-EM structure of a native, fully glycosylated, cleaved HIV-1 envelope trimer.

Cryo-EM structure of a native, fully glycosylated, cleaved HIV-1 envelope trimer.
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DOI:
10.1126/science.aad2450
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发表时间:
2016-03-04
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Ward AB
Ward AB
中科院分区:
其他
文献类型:
--
作者:
Lee JH;Ozorowski G;Ward AB

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HIV-1表面的包膜糖蛋白三聚体(Env)识别CD4+ T细胞并介导病毒进入。在这个过程中,Env经历了大量的构象重排,使其难以在其原生状态下进行研究。可溶性、稳定的三聚体为研究Env结构提供了有价值的见解,但它们缺乏疏水膜近端外区(MPER),这是广泛中和抗体(bnAbs)、跨膜结构域和细胞质尾部(CT)的重要靶点。在这里,我们提出了4.2 Å分辨率的进化支B病毒Env的低温电镜结构,只缺乏细胞质尾部(EnvΔCT),并由bnAb PGT151稳定,以及8.8 Å分辨率的重建EnvΔCT与PGT151和mper靶向抗体10E8复合物。这些结构为野生型Env结构提供了新的见解。膜源性HIV-1包膜糖蛋白三聚体的高分辨率低温电镜结构揭示了广泛中和抗体PGT151和10E8的天然结构、糖基化和表位,并为正在开发作为候选疫苗的可溶性SOSIP三聚体提供了重要的比较物。
The envelope glycoprotein trimer (Env) on the surface of HIV-1 recognizes CD4+ T cells and mediates viral entry. During this process, Env undergoes large conformational rearrangements making it difficult to study in its native state. Soluble, stabilized trimers have provided valuable insights into Env structure, but they lack the hydrophobic membrane proximal external region (MPER), which is an important target of broadly neutralizing antibodies (bnAbs), the transmembrane domain and the cytoplasmic tail (CT). Here we present a 4.2 Å resolution cryoEM structure of a clade B virus Env lacking only the cytoplasmic tail (EnvΔCT) and stabilized by the bnAb PGT151, and an 8.8 Å resolution reconstruction of EnvΔCT in complex with PGT151 and MPER-targeting antibody 10E8. These structures provide new insights into the wild-type Env structure. The high-resolution cryoEM structures of a membrane-derived HIV-1 envelope glycoprotein trimer reveal the native structure, glycosylation, and the epitopes of broadly neutralizing antibodies PGT151 and 10E8, and provides an important comparator for soluble SOSIP trimers being developed as vaccine candidates.
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