Structure of an unliganded simian immunodeficiency virus gp120 core

Bing Chen, Erik M. Vogan, Haiyun Gong, John J. Skehel, Don C. Wiley and Stephen C. Harrison ()
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Bing Chen: Harvard Medical School
Erik M. Vogan: Harvard Medical School
Haiyun Gong: Harvard Medical School
John J. Skehel: National Institute of Medical Research
Don C. Wiley: Harvard Medical School
Stephen C. Harrison: Harvard Medical School

Nature, 2005, vol. 433, issue 7028, 834-841

Abstract: Abstract Envelope glycoproteins of human and simian immunodeficiency virus (HIV and SIV) undergo a series of conformational changes when they interact with receptor (CD4) and co-receptor on the surface of a potential host cell, leading ultimately to fusion of viral and cellular membranes. Structures of fragments of gp120 and gp41 from the envelope protein are known, in conformations corresponding to their post-attachment and postfusion states, respectively. We report the crystal structure, at 4 Å resolution, of a fully glycosylated SIV gp120 core, in a conformation representing its prefusion state, before interaction with CD4. Parts of the protein have a markedly different organization than they do in the CD4-bound state. Comparison of the unliganded and CD4-bound structures leads to a model for events that accompany receptor engagement of an envelope glycoprotein trimer. The two conformations of gp120 also present distinct antigenic surfaces. We identify the binding site for a compound that inhibits viral entry.

Date: 2005
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DOI: 10.1038/nature03327

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