Abstract
Aim:
To investigate the stereoselective binding of mexiletine or ketoprofen enantiomers with different recombinant domains of human serum albumin (HSA).
Methods:
Three domains (HSA DOM I, II and III) were expressed in Pichia pastoris GS115 cells. Blue Sepharose 6 Fast Flow was employed to purify the recombinant HSA domains. The binding properties of the standard ligands, digitoxin, phenylbutazone and diazepam, and the chiral drugs to HSA domains were investigated using ultrafiltration. The concentrations of the standard ligands, ketoprofen and mexiletine were analyzed with HPLC.
Results:
The recombinant HSA domains were highly purified as shown by SDS-PAGE and Western blotting analyses. The standard HSA ligands digitoxin, phenylbutazone and diazepam selectively binds to DOM I, DOM II and DOM III, respectively. For the chiral drugs, R-ketoprofen showed a higher binding affinity toward DOM III than S-ketoprofen, whereas S-mexiletine bound to DOM II with a greater affinity than R-mexiletine.
Conclusion:
The results demonstrate that HSA DOM III possesses the chiral recognition ability for the ketoprofen enantiomers, whereas HSA DOM II possesses that for the mexiletine enantiomers.
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Acknowledgements
This project was supported by the State Key Development Program for Basic Research of China (Grant No 2011CB710800) and National Major Projects for Science and Technology Development of the Ministry of Science and Technology of China (No 2012ZX09506001-004).
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Shi, D., Jin, Yx., Tang, Yh. et al. Stereoselective binding of mexiletine and ketoprofen enantiomers with human serum albumin domains. Acta Pharmacol Sin 33, 710–716 (2012). https://doi.org/10.1038/aps.2012.8
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DOI: https://doi.org/10.1038/aps.2012.8
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