Multiplicity of DL-Glyceraldehyde Reductase Activity in Rabbit Lens

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  • 家兎水晶体のDL-グリセルアルデヒド還元酵素活性の多様性
  • カト スイショウタイ ノ DL グリセルアルデヒド カンゲン コウソ カッセイ

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Abstract

Multiplicity of DL-glyceraldehyde reductase activity in rabbit lens was investigated. Enzymes with DL-glyceraldehyde reductase activity were separated into two fractions (F-1 : unadsorbed enzyme fraction and F-2 : adsorbed enzyme fraction) by dye-affinity chromatography using Matrex gel orange A. The fraction of F-2 was further separated into four fractions with DL-glyceraldehyde reductase activity (F-2a, F-2b, F-2c and F-2d) by chromatofocusing. The enzyme in F-1 was distinct from enzymes in F-2. The molecular weight of the former was about 60000, and that of the latter was about 33000. The enzyme in F-1 was strongly active with D-erythrose as a substrate, and the enzymes in F-2 were strongly active with DL-glyceraldehyde. The enzyme in F-1 was not appreciably inhibited by aldose reductase inhibitors such as quercitrin, quercetin and 3, 3-tetramethyleneglutaric acid, whereas the enzymes in F-2 were inhibited considerably. Sulfate ion did not activate the enzyme in F-1. Four enzymes in F-2 were subdivided into 2 groups (group A : F-2a and F-2c, group B : F-2b and F-2d) on the basis of their enzymatic properties. The enzymes in both groups A and B were capable of reducing various aldoses, but D-pentose and D-hexose were poor substrates for enzymes of group B. The enzymes in group A were activated by sulfate ion, and the enzymes in group B were not activated. The enzymes in group A were more susceptible to inhibition by aldose reductase inhibitors than those in group B.

Journal

  • YAKUGAKU ZASSHI

    YAKUGAKU ZASSHI 104 (1), 62-67, 1984

    The Pharmaceutical Society of Japan

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