Adams C A, Johnson R E
United States Regional Soybean Laboratory, University of Illinois, Urbana, Illinois 61801.
Plant Physiol. 1968 Dec;43(12):2041-4. doi: 10.1104/pp.43.12.2041.
ATP sulfurylase activity was assayed in soybean leaf extracts. A simple, rapid assay system using molybdate as an analogue of sulfate was developed. The assay was coupled to inorganic pyrophosphatase. The high pyrophosphatase level in soybean leaf extracts obviated the necessity of adding this enzyme to the assay system. ATP sulfurylase has a pH maximum above 7.5, uses molybdate and ATP as substrates, and requires magnesium ions for activity.
在大豆叶片提取物中测定了ATP硫酸化酶活性。开发了一种使用钼酸盐作为硫酸盐类似物的简单、快速的测定系统。该测定与无机焦磷酸酶偶联。大豆叶片提取物中高焦磷酸酶水平消除了在测定系统中添加该酶的必要性。ATP硫酸化酶在pH高于7.5时活性最高,以钼酸盐和ATP为底物,并且需要镁离子来发挥活性。