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酶促酯化吲哚-3-乙酸到肌醇和葡萄糖。

Enzymatic Esterification of Indole-3-acetic Acid to myo-Inositol and Glucose.

机构信息

Department of Botany and Plant Pathology, Michigan State University, East Lansing, Michigan 48824.

出版信息

Plant Physiol. 1974 Dec;54(6):846-51. doi: 10.1104/pp.54.6.846.

Abstract

Incubation of mature sweet corn kernels of Zea mays in dilute solutions of (14)C-labeled indole-3-acetic acid leads to the formation of (14)C-labeled esters of myo-inositol, glucose, and glucans. Utilizing this knowledge it was found that an enzyme preparation from immature sweet corn kernels of Zea mays catalyzed the CoA- and ATP-dependent esterification of indole-3-acetic acid to myo-inositol and glucose. The esters formed were 2-O-(indole-3-acetyl)-myo-inositol, 1-dl-1-O-(indole-3-acetyl)-myo-inositol, di-O-(indole-3-acetyl)-myo-inositol, tri-O-(indole-3-acetyl)-myo-inositol, 2-O-(indole-3-acetyl)-d-glucopyranose, 4-O-(indole-3-acetyl)-d-glucopyranose and 6-O-(indole-3-acetyl)-d-glycopyranose. An assay system was developed for measuring esterification of (14)C-labeled indole-3-acetic acid by ammonolysis of the esters followed by isolation and counting the radioactive indole-3-acetamide.

摘要

在稀释的(14)C 标记的吲哚-3-乙酸溶液中孵育成熟的甜玉米籽粒,导致肌醇、葡萄糖和葡聚糖的(14)C 标记酯的形成。利用这一知识,发现来自不成熟的甜玉米籽粒的酶制剂催化 CoA 和 ATP 依赖性吲哚-3-乙酸对肌醇和葡萄糖的酯化作用。形成的酯是 2-O-(吲哚-3-乙酰基)-肌醇、1-dl-1-O-(吲哚-3-乙酰基)-肌醇、二-O-(吲哚-3-乙酰基)-肌醇、三-O-(吲哚-3-乙酰基)-肌醇、2-O-(吲哚-3-乙酰基)-d-吡喃葡萄糖、4-O-(吲哚-3-乙酰基)-d-吡喃葡萄糖和 6-O-(吲哚-3-乙酰基)-d-吡喃葡萄糖。建立了一种测定(14)C 标记吲哚-3-乙酸酯化的测定系统,方法是通过酯的氨解,然后分离和计数放射性吲哚-3-乙酰胺。

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