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| '''Structure of a longer thermalstable core domain of HIV-1 GP41 containing the enfuvirtide resistance mutation N43D and complementary mutation E137K'''
| | ===Structure of a longer thermalstable core domain of HIV-1 GP41 containing the enfuvirtide resistance mutation N43D and complementary mutation E137K=== |
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| ==Overview==
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| Enfuvirtide (ENF), the first human immunodeficiency virus type 1 (HIV-1) fusion inhibitor approved for clinical use, acts by binding to gp41 heptad repeat 1 (HR1) and preventing its interaction with the viral HR2 region. Treatment-emergent resistance to ENF has been mapped to residues within HR1, and these mutations decrease its susceptibility to ENF and may reduce viral fitness and pathogenesis, although the mechanism for these effects is not clear. N43D, a common ENF resistance mutation, was found in in vitro assays to cause a 5-50-fold in antiviral activity. We introduced this mutation into peptide models and determined the impact of this mutation by circular dichroism and X-ray crystallography. We find that the mutation results in a decrease in the thermal stability of the six-helix bundle and causes a significant change in the HR1-HR2 interface, including a loss of HR2 helicity. These data form a mechanistic basis for the decrease in ENF sensitivity and six-helix bundle stability. The E137K polymorphism, generally present at baseline in patients who develop N43D, partially compensates for the loss of stability, and we show that these residues likely form an ion pair. These data form a framework for understanding the impact of resistance mutations on viral fitness and pathogenesis and provide a pathway for the development of novel fusion inhibitor peptides.
| | The line below this paragraph, {{ABSTRACT_PUBMED_18507398}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 18507398 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_18507398}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Viral protein]] | | [[Category: Viral protein]] |
| [[Category: Virion]] | | [[Category: Virion]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jun 18 12:12:00 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 03:27:31 2008'' |
