The first optically active taurine conjugate of a bilirubin was prepared by reaction of taurine sodium salt with the mixed anhydride formed from reaction of (betaS,beta'S)-dimethylmesobilirubin-XIIIalpha with isobutyl chloroformate. Analysis of the circular dichroism spectra of the conjugate in water and chloroform indicate a conformational preference for the (M)-helical ridge-tile conformation, thus providing the first spectroscopic evidence on the conformation of ditaurobilirubins.
Absolute configuration of bilirubin conformational enantiomers
作者:Stefan E. Boiadjiev、Richard V. Person、Gisbert Puzicha、Carolyn Knobler、Emily Maverick、Kenneth N. Trueblood、David A. Lightner
DOI:10.1021/ja00052a006
日期:1992.12
is a bichromophoric tetrapyrrole formed in mammals by heme catabolism. It readily adopts either of two enantiomeric folded conformations which are shaped like ridge tiles and are stabilized by a network of intramolecular hydrogen bonds. Interconversion of the conformational enantiomers is rapid at room temperature and may bc displaced toward either enantiomer by complexation with chiralagents. Intramolecular
The first optically active taurine conjugate of a bilirubin was prepared by reaction of taurine sodium salt with the mixed anhydride formed from reaction of (betaS,beta'S)-dimethylmesobilirubin-XIIIalpha with isobutyl chloroformate. Analysis of the circular dichroism spectra of the conjugate in water and chloroform indicate a conformational preference for the (M)-helical ridge-tile conformation, thus providing the first spectroscopic evidence on the conformation of ditaurobilirubins.