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

A. Bennun, J.J. Blum
{"title":"Properties of the induced acid phosphatase and of the constitutive acid phosphatase of Euglena","authors":"A. Bennun,&nbsp;J.J. Blum","doi":"10.1016/0926-6593(66)90147-0","DOIUrl":null,"url":null,"abstract":"<div><p>The induced acid phosphatase (EC 3.1.3.2) of <em>Euglena gracilis</em> 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 <span><math><mtext>p-</mtext><mtext>nitrophenylphosphate</mtext></math></span> 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 <em>plus</em> 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 <em>in vivo</em>.</p></div>","PeriodicalId":100160,"journal":{"name":"Biochimica et Biophysica Acta (BBA) - Enzymology and Biological Oxidation","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1966-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0926-6593(66)90147-0","citationCount":"23","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biochimica et Biophysica Acta (BBA) - Enzymology and Biological Oxidation","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0926659366901470","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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.

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
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。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
自引率
0.00%
发文量
0
期刊最新文献
Author index Subject index Insect extramitochondrial glycerophosphate dehydrogenase II. Enzymic properties and amino acid composition of the enzyme from honeybee (Apis mellifera) thoraces The inter-relationships of low redox potential cytochrome c552 and hydrogenase in facultative anaerobes The threonine-sensitive homoserine dehydrogenase and aspartokinase activities of Escherichia coli
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1