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Characterization of the Stereochemical Structures of 2 H ‐Thiazolo[3,2‐ a ]pyrimidine Compounds and Their Binding Affinities for Anti‐apoptotic Bcl‐2 Family Proteins
Author(s) -
Xu Yaochun,
Zhou Mi,
Li Yan,
Li Chengke,
Zhang Zhengxi,
Yu Biao,
Wang Renxiao
Publication year - 2013
Publication title -
chemmedchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.817
H-Index - 100
eISSN - 1860-7187
pISSN - 1860-7179
DOI - 10.1002/cmdc.201300159
Subject(s) - enantiomer , chemistry , stereochemistry , affinities , pyrimidine , circular dichroism , docking (animal) , absolute configuration , binding site , crystallography , biochemistry , medicine , nursing
In a previous study we reported a class of compounds with a 2 H ‐thiazolo[3,2‐ a ]pyrimidine core structure as general inhibitors of anti‐apoptotic Bcl‐2 family proteins. However, the absolute stereochemical configuration of one carbon atom on the core structure remained unsolved, and its potential impact on the binding affinities of compounds in this class was unknown. In this study, we obtained pure R and S enantiomers of four selected compounds by HPLC separation and chiral synthesis. The absolute configurations of these enantiomers were determined by comparing their circular dichroism spectra to that of an appropriate reference compound. In addition, a crystal structure of one selected compound revealed the exocyclic double bond in these compounds to be in the Z configuration. The binding affinities of all four pairs of enantiomers to Bcl‐x L , Bcl‐2, and Mcl‐1 proteins were measured in a fluorescence‐polarization‐based binding assay, yielding inhibition constants ( K i values) ranging from 0.24 to 2.20 μ M . Interestingly, our results indicate that most R and S enantiomers exhibit similar binding affinities for the three tested proteins. A binding mode for this compound class was derived by molecular docking and molecular dynamics simulations to provide a reasonable interpretation of this observation.