NDLI: All-Atom Models of the Membrane-Spanning Domain of HIV-1 gp41 from Metadynamics

Content Provider	PubMed Central
Author	Gangupomu, Vamshi K. Abrams, Cameron F.
Copyright Year	2010
Abstract	The 27-residue membrane-spanning domain (MSD) of the HIV-1 glycoprotein gp41 bears conserved sequence elements crucial to the biological function of the virus, in particular a conserved GXXXG motif and a midspan arginine. However, structure-based explanations for the roles of these and other MSD features remain unclear. Using molecular dynamics and metadynamics calculations of an all-atom, explicit solvent, and membrane-anchored model, we study the conformational variability of the HIV-1 gp41 MSD. We find that the MSD peptide assumes a stable tilted α-helical conformation in the membrane. However, when the side chain of the midspan Arg 694 “snorkels” to the outer leaflet of the viral membrane, the MSD assumes a metastable conformation where the highly-conserved N-terminal core (between Lys681 and Arg694 and containing the GXXXG motif) unfolds. In contrast, when the Arg694 side chain snorkels to the inner leaflet, the MSD peptide assumes a metastable conformation consistent with experimental observations where the peptide kinks at Phe697 to facilitate Arg694 snorkeling. Both of these models suggest specific ways that gp41 may destabilize viral membrane, priming the virus for fusion with a target cell.
Related Links	http://dx.doi.org/10.1016/j.bpj.2010.09.054
Ending Page	3444
Page Count	7
Starting Page	3438
File Format	PDF
ISSN	00063495
e-ISSN	15420086
Journal	Biophysical Journal
Issue Number	10
Volume Number	99
Language	English
Publisher	The Biophysical Society
Publisher Date	2010-11-01
Access Restriction	Open
Rights Holder	The Biophysical Society
Subject Keyword	Biophysics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biophysics

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