title: Origin of slow conformer conversion of triostin A and interaction ability with nucleic acid bases.
abstract: The n.m.r. pattern of triostin A in weakly polar solvents was explained by the presence of two symmetrical conformers. Its S-benzyl derivative still shows the n.m.r. pattern of two conformers, while des-N-tetramethyltriostin A, which lacks the N-methyl groups, gives one conformer. Therefore the slow interconversion of two conformers arises from the cis-trans isomerization of the N-methyl peptide bonds, but not from the reversal of the chirality around the S-S bond. Only one of the two conformers of triostin A interacts with adenosine and guanosine derivatives. Des-N-tetramethyltriostin A can also interact with the purine nucleosides, but more preferentially with the adenosine derivative.
mesh_terms: D000241:Adenosine / Q000032:analysis; D055598:Chemical Phenomena; D002621:Chemistry; D006151:Guanosine / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D009696:Nucleic Acids; D011810:Quinoxalines
chemical_list: D009696:Nucleic Acids; D011810:Quinoxalines; D006151:Guanosine; C031945:triostin A; D000241:Adenosine