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Issue 4, 2012
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Insight into peptide self-assembly from anisotropic rotational diffusion derived from 13C NMR relaxation

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Abstract

The NMR heteronuclear relaxation rate's dependency on the anisotropy of rotational diffusion motions can be exploited to investigate the supramolecular organization that results from reversible peptide self-assembly in solution. The measurement of longitudinal (R1) and transverse (R2) 13C relaxation rates for several peptide concentrations provides insight both into the orientation of individual molecules within the supramolecular assembly and its growth. The methodology was applied on the pore forming cyclic lipodepsipeptide pseudodesmin A, which reversibly assembles into supramolecular structures of indefinite size in non-polar organic solvents. The information extracted by correlating the 13C R1 and R2 relaxation rates—obtained at natural abundance and at multiple peptide concentrations—with the orientation of the C–H bonds in the monomer conformation demonstrates the existence of an axially symmetric assembly that exhibits unidimensional growth upon increased peptide concentrations. The orientation of the pseudodesmin A peptide within this assembly could be determined accurately and is consistent with the suggested model for the pore forming function and the peptide-peptide interactions within the oligomer.

Graphical abstract: Insight into peptide self-assembly from anisotropic rotational diffusion derived from 13C NMR relaxation

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Publication details

The article was received on 20 Dec 2011, accepted on 26 Jan 2012 and first published on 26 Jan 2012


Article type: Edge Article
DOI: 10.1039/C2SC01088G
Citation: Chem. Sci., 2012,3, 1284-1292
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    Insight into peptide self-assembly from anisotropic rotational diffusion derived from 13C NMR relaxation

    D. Sinnaeve, M. Delsuc, J. C. Martins and B. Kieffer, Chem. Sci., 2012, 3, 1284
    DOI: 10.1039/C2SC01088G

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