Binding modes identification through molecular dynamic simulations: A case study with carnosine enantiomers and the Teicoplanin A2‐2‐based chiral stationary phase
Articolo
Data di Pubblicazione:
2020
Citazione:
Binding modes identification through molecular dynamic simulations: A case study with carnosine enantiomers and the Teicoplanin A2‐2‐based chiral stationary phase / R. Sardella, F. Ianni, L. Cossignani, G. Aldini, A. Carotti. - In: JOURNAL OF SEPARATION SCIENCE. - ISSN 1615-9306. - 43:9-10(2020 May), pp. 1728-1736. [10.1002/jssc.202000092]
Abstract:
In the present study, an in silico methodology able to define the binding modes adopted by carnosine enantiomers in the setting of the chiral recognition process is described. The inter- and intramolecular forces involved in the enantioseparation process with the Teicoplanin A2-2 chiral selector and carnosine as model compound are successfully identified. This approach fully rationalizes, at a molecular level, the (S) < (R) enantiomeric elution order obtained under reversed-phase conditions. Consistent explanations were achieved by managing molecular dynamics results with advanced techniques of data analysis. As a result, the time-dependent identification of all the interactions simultaneously occurring in the chiral selector-enantiomeric analyte binding process was obtained. Accordingly, it was found that only (R)-carnosine is able to engage a stabilizing charge-charge interaction through its ionized imidazole ring with the carboxylate counter-part on the chiral selector. Instead, (S)-carnosine establishes intramolecular contacts between its ionized functional groups, that limit its conformational freedom and impair the association with the chiral selector unit.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
molecular dynamics; binding modes; enantioseparation; chiral chromatography; teicoplanin
Elenco autori:
R. Sardella, F. Ianni, L. Cossignani, G. Aldini, A. Carotti
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