2-Oxoglutaric Acid → 4-Hydroxyisoleucine

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By using a cell lysate prepared from 2-e-2 cells at OD660 of 7 according to the method described in <5>, the reaction characteristics for various amino acids were evaluated. The cell lysate and a substrate solution were mixed, then the reaction proceeded at 30° C. for 1 hour, and the production of new substances was evaluated by TLC or amino acid analysis. The substrate reaction mixture contained 5 mM amino acid, 5 mM Fe2+, 5 mM 2-oxoglutaric acid, 5 mM ascorbic acid, and 100 mM HEPES (pH 7). In addition to L-isoleucine, the amino acids L-leucine, L-valine, L-glutamic acid, and L-lysine were each individually evaluated. The 4-hydroxyisoleucine which was produced was analyzed by the method described in Example 1. The results are shown in Table 6. Production of amino acids other than L-isoleucine was not observed. Therefore, it was suggested that this enzyme was an isoleucine-specific dioxygenase.

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