2-Oxoglutaric Acid → cis-3-Hydroxy-L-proline

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The reaction mixture was composed of 100 mM TES buffer (pH 7.0), 5 mM L-proline, 5mM 2-ketoglutaric acid, 1 mM ferrous sulfate, 5 mM L-ascorbic acid and a predetermined amount of the pure enzyme, the total volume being 100 μl. The reaction was initiated by addition of the enzyme and continued for 10 minutes at 35° C. The reaction was stopped by heating the reaction mixture at 100° C. for 2 minutes. The amount of cis-3-hydroxy-L-proline formed in the reaction mixture was determined by the pre-column derivatization method using HPLC. One hundred microliters of 0.3M boric acid buffer (pH 10.7), 4 μl of an aqueous solution of 10% (v/v) mercaptoethanol and 16 μl of ethanol solution of 5% (w/v) OPA were added to 100 μl of the reaction mixture, and the mixture was allowed to stand at 60° C. for 30 seconds. In addition, 50 μl of ethanol solution of 2% (w/v) NBD was added thereto and the mixture was allowed to stand at 60° C. for 40 minutes. The reaction was stopped by adding 30 μl of 1N HCl to the reaction mixture, and the precipitates formed were removed therefrom by centrifugation and filtration. The cis-3-hydroxy-L-proline formed by the reaction was quantitatively determined by HPLC analysis.

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