Supersite of immune vulnerability on the glycosylated face of HIV-1 envelope glycoprotein gp120.

Supersite of immune vulnerability on the glycosylated face of HIV-1 envelope glycoprotein gp120.
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DOI:
10.1038/nsmb.2594
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发表时间:
2013-07
影响因子:
16.8
通讯作者:
Wilson, Ian A.
Wilson, Ian A.
中科院分区:
生物学1区
文献类型:
--
作者:
Kong, Leopold;Lee, Jeong Hyun;Doores, Katie J.;Murin, Charles D.;Julien, Jean-Philippe;McBride, Ryan;Liu, Yan;Marozsan, Andre;Cupo, Albert;Klasse, Per-Johan;Hoffenberg, Simon;Caulfield, Michael;King, C. Richter;Hua, Yuanzi;Le, Khoa M.;Khayat, Reza;Deller, Marc C.;Clayton, Thomas;Tien, Henry;Feizi, Ten;Sanders, Rogier W.;Paulson, James C.;Moore, John P.;Stanfield, Robyn L.;Burton, Dennis R.;Ward, Andrew B.;Wilson, Ian A.

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在某些HIV感染的供体中,相当一部分广泛中和抗体(bnAb)识别HIV-1 gp 120上的聚糖依赖性表位。在这里,我们阐明了bnAb PGT 135如何识别其Asn 332聚糖依赖性表位,从其晶体结构与gp 120,CD 4和Fab 17 b在3.1 μ m分辨率。PGT 135与Asn 332、Asn 392和Asn 386处的聚糖相互作用,使用长CDR环H1和H3穿透聚糖屏蔽以进入gp 120蛋白表面。电子显微镜显示PGT 135可以通过改变其接合角来适应gp 120聚糖的构象和化学多样性。PGT 135、PGT 128和2G 12的组合结构研究表明,这种Asn 332依赖性表位是高度可及的,并且比最初认识到的更广泛,允许多种结合模式和不同的接近角度,从而代表了抗体中和的超级脆弱性。
A substantial fraction of broadly neutralizing antibodies (bnAbs) in certain HIV-infected donors recognizes glycan-dependent epitopes on HIV-1 gp120. Here, we elucidate how bnAb PGT 135 recognizes its Asn332 glycan-dependent epitope from its crystal structure with gp120, CD4 and Fab 17b at 3.1 Å resolution. PGT 135 interacts with glycans at Asn332, Asn392 and Asn386, using long CDR loops H1 and H3 to penetrate the glycan shield to access the gp120 protein surface. Electron microscopy reveals PGT 135 can accommodate the conformational and chemical diversity of gp120 glycans by altering its angle of engagement. The combined structural studies of PGT 135, PGT 128 and 2G12 show this Asn332-dependent epitope is highly accessible and much more extensive than initially appreciated, allowing for multiple binding modes and varied angles of approach, thereby representing a supersite of vulnerability for antibody neutralization.
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