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Old 11-24-2010, 09:51 PM
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Default 2D solid state NMR spectral simulation of 3(10), alpha, and pi-helices.

2D solid state NMR spectral simulation of 3(10), alpha, and pi-helices.

Related Articles 2D solid state NMR spectral simulation of 3(10), alpha, and pi-helices.

J Magn Reson. 2004 Jun;168(2):187-93

Authors: Kim S, Cross TA

Transmembrane helices are more uniform in structure than similar helices in water soluble proteins. Solid state NMR of aligned bilayer samples is being increasingly used to characterize helical membrane protein structures. Traditional spectroscopic methods have difficulty distinguishing between helices with i to i + 3 (3(10)), i to i + 4 (alpha), and i to i + 5 (pi) hydrogen bonding topology. Here, we show that resonance patterns in PISEMA spectra simulated for these different helices show unique and striking features. The size and shape of these Polar Index Slant Angle (PISA) wheels, as well as the resonances per turn and clockwise versus counter-clockwise sequential connectivity of the resonances demonstrate how these different helical structures, if present as a uniform structure, will be readily distinguished, and characterized.

PMID: 15140426 [PubMed - indexed for MEDLINE]



Source: PubMed
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