Related ArticlesSolid state NMR measurements of conformation and conformational distributions in the membrane-bound HIV-1 fusion peptide.
J Mol Graph Model. 2001;19(1):129-35
Authors: Yang J, Parkanzky PD, Khunte BA, Canlas CG, Yang R, Gabrys CM, Weliky DP
The solid state NMR lineshape of a protein backbone carbonyl nucleus is a general diagnostic of the local conformational distribution in the vicinity of that nucleus. In addition, measurements of carbonyl chemical shifts and 2D exchange spectra provide information about the most probable conformation in the distribution. These types of solid state NMR methodologies have been applied to structural studies of the membrane-bound HIV-1 fusion peptide. This peptide is derived from a domain of the HIV-1 gp41 envelope protein, which is critical for viral-host cell-membrane fusion. Even in the absence of the rest of the envelope protein, the fusion peptide will fuse liposomes or erythrocytes. The solid state NMR measurements demonstrate that the center of the membrane-bound HIV-1 fusion peptide is structured, while the C-terminus is highly disordered. The structural distribution at the peptide center is lipid-dependent, with the greatest degree of structural homogeneity in a lipid environment whose composition reflects that of the target T cells. When bound to the lipid mixture, the peptide center is predominately beta sheet. The beta-sheet structure may be diagnostic of peptide oligomerization, which is thought to be a requirement for membrane fusion activity. Although the peptide partially disrupts bilayer orientational ordering in stacked glass-plate samples, 2H NMR demonstrates that the bilayers remain intact in the presence of the fusion peptide and are not micellized. The retention of the bilayer phase may relate to the biological requirement that the virus should fuse with, but not destroy, the target host cell membrane.
[NMR paper] Solid-state NMR measurements of the kinetics of the interaction between phospholamban and Ca2+-ATPase in lipid bilayers.
Solid-state NMR measurements of the kinetics of the interaction between phospholamban and Ca2+-ATPase in lipid bilayers.
Related Articles Solid-state NMR measurements of the kinetics of the interaction between phospholamban and Ca2+-ATPase in lipid bilayers.
Mol Membr Biol. 2005 Jul-Aug;22(4):353-61
Authors: Hughes E, Middleton DA
Phospholamban (PLB) is a small transmembrane protein that regulates calcium transport across the sarcoplasmic reticulum (SR) of cardiac cells via a reversible inhibitory interaction with Ca2+-ATPase. In this work...
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[NMR paper] Probing site-specific conformational distributions in protein folding with solid-stat
Probing site-specific conformational distributions in protein folding with solid-state NMR.
Related Articles Probing site-specific conformational distributions in protein folding with solid-state NMR.
Proc Natl Acad Sci U S A. 2005 Mar 1;102(9):3284-9
Authors: Havlin RH, Tycko R
We demonstrate an experimental approach to structural studies of unfolded and partially folded proteins in which conformational distributions are probed at a site-specific level by 2D solid-state 13C NMR spectroscopy of glassy frozen solutions. Experiments on chemical...
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[NMR paper] Synthesis, enhanced fusogenicity, and solid state NMR measurements of cross-linked HI
Synthesis, enhanced fusogenicity, and solid state NMR measurements of cross-linked HIV-1 fusion peptides.
Related Articles Synthesis, enhanced fusogenicity, and solid state NMR measurements of cross-linked HIV-1 fusion peptides.
Biochemistry. 2003 Apr 1;42(12):3527-35
Authors: Yang R, Yang J, Weliky DP
In the HIV-1 gp41 and other viral fusion proteins, the minimal oligomerization state is believed to be trimeric with three N-terminal fusion peptides inserting into the membrane in close proximity. Previous studies have demonstrated that the...
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[NMR paper] Practical methods for solid-state NMR distance measurements on large biomolecules: co
Practical methods for solid-state NMR distance measurements on large biomolecules: constant-time rotational resonance.
Related Articles Practical methods for solid-state NMR distance measurements on large biomolecules: constant-time rotational resonance.
J Magn Reson. 1999 Aug;139(2):371-6
Authors: Balazs YS, Thompson LK
Simple modifications of the rotational resonance experiment substantially reduce the total experimental time needed to measure weak homonuclear dipolar couplings, a critical factor for achieving routine internuclear distance...
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11-18-2010 08:31 PM
[NMR paper] Solid-state REDOR NMR distance measurements at the ligand site of a bacterial chemota
Solid-state REDOR NMR distance measurements at the ligand site of a bacterial chemotaxis membrane receptor.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--pubs.acs.org-images-acspubs.jpg Related Articles Solid-state REDOR NMR distance measurements at the ligand site of a bacterial chemotaxis membrane receptor.
Biochemistry. 1997 Feb 18;36(7):1699-703
Authors: Wang J, Balazs YS, Thompson LK
The Escherichia coli serine receptor senses serine levels in the environment and transmits this information across the bacterial inner membrane to...
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[NMR paper] Solid-state REDOR NMR distance measurements at the ligand site of a bacterial chemota
Solid-state REDOR NMR distance measurements at the ligand site of a bacterial chemotaxis membrane receptor.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--pubs.acs.org-images-acspubs.jpg Related Articles Solid-state REDOR NMR distance measurements at the ligand site of a bacterial chemotaxis membrane receptor.
Biochemistry. 1997 Feb 18;36(7):1699-703
Authors: Wang J, Balazs YS, Thompson LK
The Escherichia coli serine receptor senses serine levels in the environment and transmits this information across the bacterial inner membrane to...
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[NMR paper] 31P solid-state NMR measurements used to detect interactions between NADPH and water
31P solid-state NMR measurements used to detect interactions between NADPH and water and to determine the ionisation state of NADPH in a protein-ligand complex subjected to low-level hydration.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--www3.interscience.wiley.com-aboutus-images-wiley_interscience_pubmed_logo_FREE_120x27.gif Related Articles 31P solid-state NMR measurements used to detect interactions between NADPH and water and to determine the ionisation state of NADPH in a protein-ligand complex subjected to low-level hydration.
Eur J Biochem. 1996 Jan...
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[NMR paper] Analysis of side-chain conformational distributions in neutrophil peptide-5 NMR struc
Analysis of side-chain conformational distributions in neutrophil peptide-5 NMR structures.
Related Articles Analysis of side-chain conformational distributions in neutrophil peptide-5 NMR structures.
Biopolymers. 1990 Dec;29(14):1807-22
Authors: Kominos D, Bassolino DA, Levy RM, Pardi A
The side-chain conformations have been analyzed in the antimicrobial peptide, Neutrophil Peptide-5 (NP-5), whose structure was independently generated from nmr-derived distance constraints using a distance geometry algorithm. The side-chain and peptide...