Structure and dynamics of the lipid modifications of a transmembrane ?-helical peptide determined by (2)H solid-state NMR spectroscopy.
Biochim Biophys Acta. 2010 Dec 28;
Authors: Penk A, Müller M, Scheidt HA, Langosch D, Huster D
The fusion of biological membranes is mediated by integral membrane proteins with ?-helical transmembrane segments. Additionally, those proteins are often modified by the covalent attachment of hydrocarbon chains. Previously, a series of de novo designed ?-helical peptides with mixed Leu/Val sequences was presented, mimicking fusiogenically active transmembrane segments in model membranes (Hofmann et al., Proc. Natl. Acad. Sci. USA 101 (2004) 14776-14781). From this series, we have investigated the peptide LV16 (KKKW LVLV LVLV LVLV LVLV KKK), which was synthesized featuring either a free N-terminus or a saturated N-acylation of 2, 8, 12, or 16 carbons. We used (2)H and (31)P NMR spectroscopy to investigate the structure and dynamics of those peptide lipid modifications in POPC and DLPC bilayers and compared them to the hydrocarbon chains of the surrounding membrane. Except for the C2 chain, all peptide acyl chains were found to insert well into the membrane. This can be explained by the high local lipid concentrations the N-terminal lipid chains experience. Further, the insertion of these peptides did not influence the membrane structure and dynamics as seen from the (2)H and (31)P NMR data. In spite of the fact that the longer acyl chains insert into the membrane, they do not adapt their lengths to the thickness of the bilayer. Even the C16 lipid chain on the peptide, which could match the length of the POPC palmitoyl chain, exhibited lower order parameters in the upper chain, which get closer and finally reach similar values in the lower chain region. (2)H NMR square law plots reveal motions of slightly larger amplitudes for the peptide lipid chains compared to the surrounding phospholipids. In spite of the significantly different chain lengths of the acylations, the fraction of gauche defects in the inserted chains is constant.
PMID: 21192915 [PubMed - as supplied by publisher]
Proton-Detected Solid-State NMR Reveals Intramembrane Polar Networks in a Seven-Helical Transmembrane Protein Proteorhodopsin
Proton-Detected Solid-State NMR Reveals Intramembrane Polar Networks in a Seven-Helical Transmembrane Protein Proteorhodopsin
Meaghan E. Ward, Lichi Shi, Evelyn Lake, Sridevi Krishnamurthy, Howard Hutchins, Leonid S. Brown and Vladimir Ladizhansky
http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/0/jacsat.ahead-of-print/ja207137h/aop/images/medium/ja-2011-07137h_0008.gif
Journal of the American Chemical Society
DOI: 10.1021/ja207137h
http://feeds.feedburner.com/~ff/acs/jacsat?d=yIl2AUoC8zA
http://feeds.feedburner.com/~r/acs/jacsat/~4/Vzwkh1cjxOU
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10-09-2011 06:15 AM
Proton Detected Solid-State NMR Reveals Intramembrane Polar Networks in a Seven-Helical Transmembrane Protein Proteorhodopsin.
Proton Detected Solid-State NMR Reveals Intramembrane Polar Networks in a Seven-Helical Transmembrane Protein Proteorhodopsin.
Proton Detected Solid-State NMR Reveals Intramembrane Polar Networks in a Seven-Helical Transmembrane Protein Proteorhodopsin.
J Am Chem Soc. 2011 Sep 16;
Authors: Ward ME, Shi L, Lake EM, Krishnamurthy S, Hutchins H, Brown LS, Ladizhansky V
Abstract
We used high-resolution proton-detected multidimensional NMR to study the solvent-exposed parts of an integral seven-helical membrane proton pump proteorhodopsin...
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09-17-2011 08:21 PM
Site-Specific Solid-State NMR Detection of Hydrogen-Deuterium Exchange Reveals Conformational Changes in a 7-Helical Transmembrane Protein.
Site-Specific Solid-State NMR Detection of Hydrogen-Deuterium Exchange Reveals Conformational Changes in a 7-Helical Transmembrane Protein.
Site-Specific Solid-State NMR Detection of Hydrogen-Deuterium Exchange Reveals Conformational Changes in a 7-Helical Transmembrane Protein.
Biophys J. 2011 Aug 3;101(3):L23-L25
Authors: Wang S, Shi L, Kawamura I, Brown LS, Ladizhansky V
Solid-state NMR spectroscopy is an efficient tool for following conformational dynamics of membrane proteins at atomic resolution. We used this technique for the site-specific...
Uniform isotope labeling of a eukaryotic seven-transmembrane helical protein in yeast enables high-resolution solid-state NMR studies in the lipid environment
Uniform isotope labeling of a eukaryotic seven-transmembrane helical protein in yeast enables high-resolution solid-state NMR studies in the lipid environment
Abstract Overexpression of isotope-labeled multi-spanning eukaryotic membrane proteins for structural NMR studies is often challenging. On the one hand, difficulties with achieving proper folding, membrane insertion, and native-like post-translational modifications frequently disqualify bacterial expression systems. On the other hand, eukaryotic cell cultures can be prohibitively expensive. One of the viable alternatives,...
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01-22-2011 03:46 AM
Uniform isotope labeling of a eukaryotic seven-transmembrane helical protein in yeast enables high-resolution solid-state NMR studies in the lipid environment.
Uniform isotope labeling of a eukaryotic seven-transmembrane helical protein in yeast enables high-resolution solid-state NMR studies in the lipid environment.
Uniform isotope labeling of a eukaryotic seven-transmembrane helical protein in yeast enables high-resolution solid-state NMR studies in the lipid environment.
J Biomol NMR. 2011 Jan 19;
Authors: Fan Y, Shi L, Ladizhansky V, Brown LS
Overexpression of isotope-labeled multi-spanning eukaryotic membrane proteins for structural NMR studies is often challenging. On the one hand, difficulties...
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01-21-2011 01:22 AM
[NMR paper] Lipid modifications of a Ras peptide exhibit altered packing and mobility versus host membrane as detected by 2H solid-state NMR.
Lipid modifications of a Ras peptide exhibit altered packing and mobility versus host membrane as detected by 2H solid-state NMR.
Related Articles Lipid modifications of a Ras peptide exhibit altered packing and mobility versus host membrane as detected by 2H solid-state NMR.
J Am Chem Soc. 2005 Sep 7;127(35):12263-72
Authors: Vogel A, Katzka CP, Waldmann H, Arnold K, Brown MF, Huster D
The human N-ras protein binds to cellular membranes by insertion of two covalently bound posttranslational lipid modifications, which is crucial for its...
Structure and dynamics of the lipid modifications of a transmembrane ?-helical peptide determined by (2)H solid-state NMR spectroscopy.
Linear Mode
