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Determination of 4‐hydroxyproline‐2‐epimerase activity by capillary electrophoresis: A stereoselective platform for inhibitor screening of amino acid isomerases
Author(s) -
Gavina Jennilee M. A.,
White Catharine E.,
Finan Turlough M.,
BritzMcKibbin Philip
Publication year - 2010
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201000187
Subject(s) - isomerase , chemistry , hydroxyproline , stereoselectivity , amino acid , proline , diastereomer , enantiomer , enzyme , isomerization , capillary electrophoresis , biochemistry , stereochemistry , chromatography , catalysis
Isomerases involved in the metabolism of D / L ‐amino acids represent promising therapeutic targets for treatment of disease. Herein, we report a tunable platform for the assessment of enzymatic kinetics involving amino acid isomerization by CE that offers improved selectivity and sensitivity over traditional methods. Enzyme activity and competition assays were evaluated for various hydroxyproline diastereoisomers, proline enantiomers and their structural analogs using 4‐hydroxyproline‐2‐epimerase as a model system. In this work, pyrrole 2‐carboxylic acid was found to be a selective inhibitor of 4‐hydroxyproline‐2‐epimerase with a half‐maximal inhibition concentration of (2.3±0.1) mM. Reliable methods for unambiguous characterization of amino acid isomerases are required for the screening of novel inhibitors with epimerase and/or racemase activity.