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Conformational properties of the macrocyclic trichothecene mycotoxin verrucarin A in solution
Authors:Fragaki Georgia  Stefanaki Irine  Dais Photis  Mikros Emmanuel
Institution:NMR Laboratory, Department of Chemistry, University of Crete, Voutes Campus, 71003 Heraklion, Crete, Greece.
Abstract:Phase-sensitive nuclear Overhauser enhancement spectroscopy (NOESY) experiments, (3)J couplings and computational molecular modeling (MM2* and MMFF force fields) were employed to examine the conformational properties of verrucarin A in chloroform solutions. The MMFF force field calculations resulted in a family of 12 low-energy structures along with their populations, the latter being determined by the NMR analysis of molecular flexibility in solution(NAMFIS) deconvolution analysis. The concluded model was capable of reproducing successfully the experimental NOESY cross-peak volumes and the proton-coupling constants. Among the 12 conformers, the one which was similar to the structure of verrucarin A in the solid state was the predominant accounting for 75% of the total relative population, although other low-energy conformations contributed to a lesser degree in order to explain the experimental data.
Keywords:verrucarin A  conformational analysis  MM2*  MMFF  NAMFIS  NMR  NOESY  CORMA
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