{"title":"Purification of the mannitol-i-phosphate dehydrogenase of Escherichia coli","authors":"Leiv Klungsøyr","doi":"10.1016/0926-6593(66)90141-X","DOIUrl":null,"url":null,"abstract":"<div><p></p><ul><li><span>1.</span><span><p>1. Mannitol-<span>i</span>-phosphate dehydrogenase (<span>d</span>-mannitol-<span>i</span>-phosphate: NAD<sup>+</sup> oxidoreductase, EC 1.1.1.17) was purified by a simple procedure from mannitol-grown <em>Escherichia coli</em>.</p></span></li><li><span>2.</span><span><p>2. The active protein was apparently homogeneous in the ultracentrifuge, with a molecular weight of 25 000. At pH 9.0 the <span><math><mtext>K</mtext><msub><mi></mi><mn>m</mn></msub></math></span> for mannitol <span>i</span>-phosphate was <span><math><mtext>3.1·10</mtext><msup><mi></mi><mn>−4</mn></msup><mtext>M</mtext></math></span>, and the <span><math><mtext>K</mtext><msub><mi></mi><mn>m</mn></msub></math></span> for NAD<sup>+</sup> was <span><math><mtext>1.4·10</mtext><msup><mi></mi><mn>−4</mn></msup><mtext>M</mtext></math></span>. At pH 7.0 the <span><math><mtext>K</mtext><msub><mi></mi><mn>m</mn></msub></math></span> for fructose 6-phosphate was <span><math><mtext>1.6·10</mtext><msup><mi></mi><mn>−4</mn></msup><mtext>M</mtext></math></span>, while that for NADH was <span><math><mtext>4.2·10</mtext><msup><mi></mi><mn>−6</mn></msup><mtext>M</mtext></math></span>. Adenosine phosphates inhibited the enzyme reaction in both directions.</p></span></li><li><span>3.</span><span><p>3. In mannitol-grown <em>E. coli</em>, mannitol-<span>i</span>-phosphate dehydrogenase may account for nearly 2% of the total soluble protein.</p></span></li></ul></div>","PeriodicalId":100160,"journal":{"name":"Biochimica et Biophysica Acta (BBA) - Enzymology and Biological Oxidation","volume":"128 1","pages":"Pages 55-62"},"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)90141-X","citationCount":"12","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/092665936690141X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 12
Abstract
1.
1. Mannitol-i-phosphate dehydrogenase (d-mannitol-i-phosphate: NAD+ oxidoreductase, EC 1.1.1.17) was purified by a simple procedure from mannitol-grown Escherichia coli.
2.
2. The active protein was apparently homogeneous in the ultracentrifuge, with a molecular weight of 25 000. At pH 9.0 the for mannitol i-phosphate was , and the for NAD+ was . At pH 7.0 the for fructose 6-phosphate was , while that for NADH was . Adenosine phosphates inhibited the enzyme reaction in both directions.
3.
3. In mannitol-grown E. coli, mannitol-i-phosphate dehydrogenase may account for nearly 2% of the total soluble protein.