Structure of HIV-1 gp120 V1/V2 domain with broadly neutralizing antibody PG9.

Structure of HIV-1 gp120 V1/V2 domain with broadly neutralizing antibody PG9.
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DOI:
10.1038/nature10696
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发表时间:
2011-11-23
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:
McLellan, Jason S.;Pancera, Marie;Carrico, Chris;Gorman, Jason;Julien, Jean-Philippe;Khayat, Reza;Louder, Robert;Pejchal, Robert;Sastry, Mallika;Dai, Kaifan;O'Dell, Sijy;Patel, Nikita;Shahzad-ul-Hussan, Syed;Yang, Yongping;Zhang, Baoshan;Zhou, Tongqing;Zhu, Jiang;Boyington, Jeffrey C.;Chuang, Gwo-Yu;Diwanji, Devan;Georgiev, Ivelin;Do Kwon, Young;Lee, Doyung;Louder, Mark K.;Moquin, Stephanie;Schmidt, Stephen D.;Yang, Zhi-Yong;Bonsignori, Mattia;Crump, John A.;Kapiga, Saidi H.;Sam, Noel E.;Haynes, Barton F.;Burton, Dennis R.;Koff, Wayne C.;Walker, Laura M.;Phogat, Sanjay;Wyatt, Richard;Orwenyo, Jared;Wang, Lai-Xi;Arthos, James;Bewley, Carole A.;Mascola, John R.;Nabel, Gary J.;Schief, William R.;Ward, Andrew B.;Wilson, Ian A.;Kwong, Peter D.

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人类免疫缺陷病毒 1 (HIV-1) gp120 包膜糖蛋白的可变区 1 和 2 (V1/V2) 对于病毒逃避抗体中和至关重要,并且其本身受到非凡的序列多样性和 N 连接糖基化的保护。尽管如此,PG9 等人类抗体仍能与 V1/V2 结合并中和 80% 的 HIV-1 分离株。在这里,我们报道了 V1/V2 与 PG9 复合物的结构。 V1/V2 形成一个四链 β-折叠结构域,其中序列多样性和糖基化很大程度上被分离到链连接环上。 PG9 识别涉及静电、序列无关和聚糖相互作用:后者占相互作用表面的一半以上,但亲和力足够弱以避免自身反应。 V1/V2 定向抗体 CH04 和 PGT145 的结构表明它们具有通过扩展阴离子环进行聚糖渗透的共同模式。除了在结构上定义 V1/V2 之外,结果还确定了高度糖基化抗原的抗体识别范例,其中 PG9 涉及仅包含两个聚糖和一条链的脆弱位点。
Variable regions 1 and 2 (V1/V2) of human immunodeficiency virus-1 (HIV-1) gp120 envelope glycoprotein are critical for viral evasion of antibody neutralization, and are themselves protected by extraordinary sequence diversity and N-linked glycosylation. Human antibodies such as PG9 nonetheless engage V1/V2 and neutralize 80% of HIV-1 isolates. Here we report the structure of V1/V2 in complex with PG9. V1/V2 forms a four-stranded β-sheet domain, in which sequence diversity and glycosylation are largely segregated to strand-connecting loops. PG9 recognition involves electrostatic, sequence-independent and glycan interactions: the latter account for over half the interactive surface but are of sufficiently weak affinity to avoid autoreactivity. The structures of V1/V2-directed antibodies CH04 and PGT145 indicate that they share a common mode of glycan penetration by extended anionic loops. In addition to structurally defining V1/V2, the results thus identify a paradigm of antibody recognition for highly glycosylated antigens, which—with PG9—involves a site of vulnerability comprising just two glycans and a strand.
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