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1k33

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{{STRUCTURE_1k33| PDB=1k33 | SCENE= }}
{{STRUCTURE_1k33| PDB=1k33 | SCENE= }}
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'''Crystal structure analysis of the gp41 core mutant'''
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===Crystal structure analysis of the gp41 core mutant===
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==Overview==
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The human immunodeficiency virus type 1 (HIV-1) envelope glycoprotein complex (gp120-gp41) promotes viral entry by mediating the fusion of viral and cellular membranes. Formation of a stable trimer-of-hairpins structure in the gp41 ectodomain brings the two membranes into proximity, leading to membrane fusion. The core of this hairpin structure is a six-helix bundle in which three carboxyl-terminal outer helices pack against an inner trimeric coiled coil. Here we investigate the role of these conserved interhelical interactions on the structure and function of both the envelope glycoprotein and the gp41 core. We have replaced each of the eight amino acids at the buried face of the carboxyl-terminal helix with a representative amino acid, alanine. Structural and physicochemical characterization of the alanine mutants shows that hydrophobic interactions are a dominant factor in the stabilization of the six-helix bundle. Alanine substitutions at the Trp628, Trp631, Ile635, and Ile642 residues also affected envelope processing and/or gp120-gp41 association and abrogated the ability of the envelope glycoprotein to mediate cell-cell fusion. These results suggest that the amino-terminal region of the gp41 outer-layer alpha-helix plays a key role in the sequence of events associated with HIV-1 entry and have implications for the development of antibodies and small-molecule inhibitors of this conserved element.
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(as it appears on PubMed at http://www.pubmed.gov), where 12044159 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12044159}}
==About this Structure==
==About this Structure==
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[[Category: Six-helix bundle]]
[[Category: Six-helix bundle]]
[[Category: Trimer-of-hairpin]]
[[Category: Trimer-of-hairpin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 22:14:29 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 22:12:22 2008''

Revision as of 19:20, 1 July 2008

Image:1k33.png

Template:STRUCTURE 1k33

Crystal structure analysis of the gp41 core mutant

Template:ABSTRACT PUBMED 12044159

About this Structure

1K33 is a Single protein structure of sequence from Human immunodeficiency virus 1. Full crystallographic information is available from OCA.

Reference

Interhelical interactions in the gp41 core: implications for activation of HIV-1 membrane fusion., Wang S, York J, Shu W, Stoller MO, Nunberg JH, Lu M, Biochemistry. 2002 Jun 11;41(23):7283-92. PMID:12044159

Page seeded by OCA on Tue Jul 1 22:12:22 2008

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