ISDA

Entry Detail

PDB ID:

4JM4

Keywords:

IMMUNE SYSTEM

Title:

Crystal Structure of PGT 135 Fab

Biological Source:

Source Organism:

Homo sapiens

Host Organism:

Spodoptera frugiperda

PDB Version:

Deposition Date:

2013-03-13

Release Date:

2013-05-29

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.75 Å

R-Value Free:

0.24

R-Value Work:

0.20

R-Value Observed:

0.20

Space Group:

P 21 21 2

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Macromolecular Entities

Polymer Type:polypeptide(L)
Description:PGT 135 Heavy Chain
Chain IDs:A (auth: H)
Chain Length:236
Number of Molecules:1
Biological Source:Homo sapiens

Polymer Type:polypeptide(L)
Description:PGT 135 Light Chain
Chain IDs:B (auth: L)
Chain Length:214
Number of Molecules:1
Biological Source:Homo sapiens

Primary Citation

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

Kong, L, Lee, J.H, Doores, K.J, Murin, C.D, Julien, J.P, McBride, R, Liu, Y, Marozsan, A, Cupo, A, Klasse, P.J, Hoffenberg, S, Caulfield, M, King, C.R, Hua, Y, Le, K.M, Khayat, R, Deller, M.C, Clayton, T, Tien, H, Feizi, T, Sanders, R.W, Paulson, J.C, Moore, J.P, Stanfield, R.L, Burton, D.R, Ward, A.B, Wilson, I.A.Show

Nat.Struct.Mol.Biol. 20 796 803 (2013)

PMID: 23708606 DOI: 10.1038/nsmb.2594

Abstact

A substantial proportion of the broadly neutralizing antibodies (bnAbs) identified in certain HIV-infected donors recognize glycan-dependent epitopes on HIV-1 gp120. Here we elucidate how the bnAb PGT 135 binds its Asn332 glycan-dependent epitope from its 3.1-Å crystal structure with gp120, CD4 and Fab 17b. PGT 135 interacts with glycans at Asn332, Asn392 and Asn386, using long CDR loops H1 and H3 to penetrate the glycan shield and access the gp120 protein surface. EM reveals that PGT 135 can accommodate the conformational and chemical diversity of gp120 glycans by altering its angle of engagement. Combined structural studies of PGT 135, PGT 128 and 2G12 show that this Asn332-dependent antigenic region is highly accessible and much more extensive than initially appreciated, which allows for multiple binding modes and varied angles of approach; thereby it represents a supersite of vulnerability for antibody neutralization.

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