Properties of the induced acid phosphatase and of the constitutive acid phosphatase of Euglena

A. Bennun, J.J. Blum
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引用次数: 23

Abstract

The induced acid phosphatase (EC 3.1.3.2) of Euglena gracilis has been solubilized and partially purified. The enzyme has a wide range of substrate specificity and, as predicted from earlier studies on whole cells, the ratio of its activity at pH 5 to its activity at pH 7 in presence of 5 mM fluoride is 1.1 for p-nitrophenylphosphate as substrate. The enzyme is competitively inhibited by arsenate and phosphate, but exhibits mixed competitive-non-competitive inhibition with molybdate. The enzyme migrates towards the cathode when electrophoresis is performed on cellulose acetate strips at pH 8.2. Euglena also contains several other acid phosphatases. The two major constitutive acid phosphatases, which remain particle-bound after a variety of extraction procedures, differ in their thermal stability from each other and from the induced phosphatase. The ratio of activity at pH 5 to the activity at pH 7 plus 5 mM fluoride for the mixture of these two constitutive enzymes is 15. These observations establish that the increase in acid phosphatase activity occurring in Euglena in response to phosphate deprivation is due to the synthesis of a separate enzyme. The heat of thermal inactivation of the purified induced enzyme is about four times larger than the heat of denaturation computed from the effect of temperature on the rate of reversion of the induced phosphatase in vivo.

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绿藻诱导酸性磷酸酶及其组成性酸性磷酸酶的性质
对细叶茅诱导的酸性磷酸酶(EC 3.1.3.2)进行了溶解和部分纯化。该酶具有广泛的底物特异性,正如早期对整个细胞的研究所预测的那样,对硝基苯磷酸盐作为底物,其在pH 5下的活性与在pH 7下存在5毫米氟化物时的活性之比为1.1。该酶被砷酸盐和磷酸盐竞争性抑制,但与钼酸盐表现出混合竞争性和非竞争性抑制。当电泳在pH值为8.2的醋酸纤维素条上进行时,酶向阴极迁移。绿藻还含有其他几种酸性磷酸酶。这两种主要的组成型酸性磷酸酶在各种提取过程后仍保持颗粒结合,它们的热稳定性不同于彼此,也不同于诱导的磷酸酶。这两种组成酶的混合物在pH值为5时的活性与pH值为7加5毫米氟化物时的活性之比为15。这些观察结果表明,绿藻中酸性磷酸酶活性的增加是由于一种单独的酶的合成而引起的。纯化的诱导酶的热失活热大约是由温度对体内诱导磷酸酶还原速率的影响计算的变性热的四倍。
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