Chiral discrimination between tyrosine and ß-cyclodextrin revealed by cryogenic ion trap infrared spectroscopy.
Phys Chem Chem Phys
; 22(43): 24887-24894, 2020 Nov 21.
Article
en En
| MEDLINE
| ID: mdl-32914820
ABSTRACT
Complexes of permethylated ß-cyclodextrin (ß-MCD) with the two enantiomers of protonated tyrosine (l- and d-TyrH+) are studied by cryogenic ion trap infrared photo-dissociation spectroscopy. The vibrational spectra in the OH/NH stretch and fingerprint regions are assigned based on density functional theory calculations. The spectrum of both l- and d-TyrH+ complexes contains features characteristic of a first structure with ammonium and acid groups of the amino acid simultaneously interacting with the ß-MCD, the phenolic OH remaining free. A second structure involving additional interaction between the phenolic OH and the ß-MCD is observed only for the complex with d-TyrH+. The larger abundance of the d-TyrH+ complex in the mass spectrum is tentatively explained in terms of (1) better insertion of d-TyrH+ within the cavity with the hydrophobic aromatic moiety less exposed to hydrophilic solvent molecules and (2) a stiff structure involving three interaction points, namely the ammonium, the phenolic OH and the carboxylic acid OH, which is not possible for the complex with l-TyrH+. The recognition process does not occur through size effects that induce complementarity to the host molecule but specific interactions. These results provide a comprehensive understanding of how the cyclodextrin recognises a chiral biomolecule.
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Espectrofotometría Infrarroja
/
Tirosina
/
Beta-Ciclodextrinas
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Phys Chem Chem Phys
Asunto de la revista:
BIOFISICA
/
QUIMICA
Año:
2020
Tipo del documento:
Article