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Disordered proteins:
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NMR sample preparation:
Protein disorder:
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Default Solution structure determination by NMR spectroscopy of a synthetic peptide correspon

Solution structure determination by NMR spectroscopy of a synthetic peptide corresponding to a putative amphipathic alpha-helix of spiralin: resonance assignment, distance geometry and simulated annealing.

Related Articles Solution structure determination by NMR spectroscopy of a synthetic peptide corresponding to a putative amphipathic alpha-helix of spiralin: resonance assignment, distance geometry and simulated annealing.

Biochim Biophys Acta. 1995 May 4;1235(2):169-77

Authors: Bondon A, Berthault P, Segalas I, Perly B, Wróblewski H

Spiralin is the major protein of the plasma membrane of several spiroplasmas. Neither the function of this protein nor the crystallographic structure is known. Analysis of the primary structure of spiralin from Spiroplasma melliferum BC3 suggests the presence of an amphipathic peptide in the 143-162 region (Chevalier, C., Saillard, C. and Bové, J.M. (1990) J. Bacteriol. 172, 6090-6097). The structure of a synthetic peptide, H2N-L-N-A-V-N-T-Y-A-T-L-A-K-A-V-L-D-A-I-Q-N-amide, corresponding to this fragment has been examined by 1H-NMR spectroscopy. This 20 amino acid peptide adopts a random coil structure in solution, but the addition of trifluoroethanol stabilizes a structure exhibiting alpha-helical character. The 1H-NMR spectrum has been fully assigned in CF3CD2OD/H2O (30:70, v/v) and the three-dimensional structure has been elucidated using NMR-derived distance information. The calculated structures have been obtained by dynamical simulated annealing or distance geometry followed by simulated annealing. Both sets of structures have been energy-minimized using CHARMm potential. The resulting structures are very similar in terms of constraint violations and energies. It is demonstrated that whereas the first three residues exhibit a large flexibility, the remaining sequence is helical.

PMID: 7756323 [PubMed - indexed for MEDLINE]



Source: PubMed
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