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Crystal structure of the simian immunodeficiency virus (SIV) gp41 core: Conserved helical interactions underlie the broad inhibitory activity of gp41 peptides

Malashkevich, Vladimir N. and Chan, David C. and Chutkowski, Christine T. and Kim, Peter S. (1998) Crystal structure of the simian immunodeficiency virus (SIV) gp41 core: Conserved helical interactions underlie the broad inhibitory activity of gp41 peptides. Proceedings of the National Academy of Sciences of the United States of America, 95 (16). pp. 9134-9139. ISSN 0027-8424. PMCID PMC21304. http://resolver.caltech.edu/CaltechAUTHORS:20170707-145412080

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Abstract

The gp41 subunit of the envelope protein complex from human and simian immunodeficiency viruses (HIV and SIV) mediates membrane fusion during viral entry. The crystal structure of the HIV-1 gp41 ectodomain core in its proposed fusion-active state is a six-helix bundle. Here we have reconstituted the core of the SIV gp41 ectodomain with two synthetic peptides called SIV N36 and SIV C34, which form a highly helical trimer of heterodimers. The 2.2 Å resolution crystal structure of this SIV N36/C34 complex is very similar to the analogous structure in HIV-1 gp41. In both structures, three N36 helices form a central trimeric coiled coil. Three C34 helices pack in an antiparallel orientation into highly conserved, hydrophobic grooves along the surface of this coiled coil. The conserved nature of the N36-C34 interface suggests that the HIV-1 and SIV peptides are functionally interchangeable. Indeed, a heterotypic complex between HIV-1 N36 and SIV C34 peptides is highly helical and stable. Moreover, as with HIV-1 C34, the SIV C34 peptide is a potent inhibitor of HIV-1 infection. These results identify conserved packing interactions between the N and C helices of gp41 and have implications for the development of C peptide analogs with broad inhibitory activity.


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http://www.pnas.org/content/95/16/9134.abstractPublisherArticle
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC21304PubMed CentralArticle
Additional Information:© 1998 National Academy of Sciences. Contributed by Peter S. Kim, June 9, 1998. We thank Michael Burgess, James Pang, and Roberta Moro for peptide synthesis support, and Dr. Benjamin Chen for reagents and helpful advice on viral infection assays. D.C.C. is supported by a postdoctoral fellowship from the Jane Coffin Childs Memorial Fund for Medical Research. This research was funded by the National Institutes of Health (PO1 GM56552) and utilized the W. M. Keck Foundation X-Ray Crystallography Facility at the Whitehead Institute. Data deposition: The atomic coordinates have been deposited in the Protein Data Bank, Biology Department, Brookhaven National Laboratory, Upton, NY 11973 (PDB ID code 2 siv) and are available immediately at the website http://www.wi.mit.edu/kim/home.html. The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. §1734 solely to indicate this fact.
Funders:
Funding AgencyGrant Number
Jane Coffin Childs Memorial Fund for Medical ResearchUNSPECIFIED
NIHPO1 GM56552
PubMed Central ID:PMC21304
Record Number:CaltechAUTHORS:20170707-145412080
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170707-145412080
Official Citation:Vladimir N. Malashkevich, David C. Chan, Christine T. Chutkowski, and Peter S. Kim Crystal structure of the simian immunodeficiency virus (SIV) gp41 core: Conserved helical interactions underlie the broad inhibitory activity of gp41 peptides PNAS 1998 95 (16) 9134-9139
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78871
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Jul 2017 17:30
Last Modified:10 Jul 2017 17:30

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