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pubmed-article:2449690pubmed:abstractText[Ala3-15N][Val1]Gramicidin A has been prepared by solid-phase peptide synthesis and studied by solid-state 15N nuclear magnetic resonance spectroscopy. The synthesis of desformyl[Ala3-15N][Val1]gramicidin A employed N-hydroxysuccinimide esters of 9-fluorenylmethoxycarbonyl-N alpha-amino acids and completely avoided the use of acid. Since deblocking was done with piperidine and the peptide was removed from the resin by treatment with ethanolamine, this synthetic protocol prevented oxidation of the indole rings of this tryptophan-rich peptide and reduced truncations produced by acid hydrolysis. After formylation and purification by anion-exchange and high-pressure liquid chromatography, the peptide was obtained in an overall yield of 30%. Solid-state 15N nuclear magnetic resonance spectra of this peptide and uniformly labeled [15N]gramicidin A' oriented in hydrated lipid bilayers have been obtained, allowing unambiguous assignment of the [15N]Ala3 resonance in the latter. The solid-state 15N nuclear magnetic resonance experiments provide evidence that [Val1]gramicidin A is rotating about an axis that is perpendicular to the plane of the lipid bilayer and that the N--H axis is nearly parallel with the rotational axis. This study demonstrates that site-specifically labeled [15N]gramicidin A analogs prepared by solid-phase peptide synthesis are valuable tools in the study of the solid-state nuclear magnetic resonance spectra of samples in oriented lipid bilayers.lld:pubmed
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pubmed-article:2449690pubmed:authorpubmed-author:Van WartH EHElld:pubmed
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pubmed-article:2449690pubmed:articleTitleSolid-phase peptide synthesis and solid-state NMR spectroscopy of [Ala3-15N][Val1]gramicidin A.lld:pubmed
pubmed-article:2449690pubmed:affiliationDepartment of Chemistry, Florida State University, Tallahassee 32306-3006.lld:pubmed
pubmed-article:2449690pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2449690pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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