{"title":"Regulation of Urease Cellular Levels in the Cyanobacteria Anacystis nidulans and Nostoc muscorum","authors":"Surendra Singh","doi":"10.1016/S0015-3796(11)80257-X","DOIUrl":null,"url":null,"abstract":"<div><p>The effect of nitrogen source on the cellular activity level of urease has been examined in the cyanobacteria <em>Anacystis nidulans</em> and <em>Nostoc muscorum</em>. In both, the N<sub>2</sub>-fixing <em>N. muscorum</em> as well as non N<sub>2</sub>-fixing <em>A. nidulans</em>, urea did not behave as an nutritional inducer of urease. NH<sub>4</sub><sup>+</sup> promoted repression of urease was evident in both the cyanobacteria which was freed by Lmethionine, dl-sulphoximine (MSX), an irreversible inhibitor of glutamine synthetase. NH4, must therefore, be metabolised through glutamine synthetase before repressing the urease activity.</p></div>","PeriodicalId":8798,"journal":{"name":"Biochemie und Physiologie der Pflanzen","volume":"188 1","pages":"Pages 33-38"},"PeriodicalIF":0.0000,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0015-3796(11)80257-X","citationCount":"10","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biochemie und Physiologie der Pflanzen","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S001537961180257X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 10
Abstract
The effect of nitrogen source on the cellular activity level of urease has been examined in the cyanobacteria Anacystis nidulans and Nostoc muscorum. In both, the N2-fixing N. muscorum as well as non N2-fixing A. nidulans, urea did not behave as an nutritional inducer of urease. NH4+ promoted repression of urease was evident in both the cyanobacteria which was freed by Lmethionine, dl-sulphoximine (MSX), an irreversible inhibitor of glutamine synthetase. NH4, must therefore, be metabolised through glutamine synthetase before repressing the urease activity.
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