{"title":"从肠系膜Leuconostoc NRRL B-640中纯化的葡聚糖酶为单一均相蛋白:非变性Native-PAGE分析","authors":"R. K. Purama, A. Goyal","doi":"10.5580/1b1d","DOIUrl":null,"url":null,"abstract":"The extracellular dextransucrase from Leuconostoc mesenteroides NRRL B-640 was purified using polyethylene glycol (PEG-400) fractionation. A 25% (v/v) PEG-400 concentration gave dextransucrase with maximum specific activity of 9.2 U/mg with 16 fold purification in a single step. The purified enzyme by PEG-400 showed multiple protein bands on SDS-PAGE with one prominent band corresponding to the size 180 kDa (12). However, the same PEG-$00 fractionated dextransucrase samples showed single, intact and homogeneous band when analyzed on non-denaturing native-PAGE. This showed that dextransucrase remains in single molecular form in the native state and shows multiple forms only under denaturing conditions when it is heated before loading and when it contained SDS or 2-mercaptoethanol.","PeriodicalId":22514,"journal":{"name":"The Internet journal of microbiology","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2008-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":"{\"title\":\"Purified Dextransucrase from Leuconostoc mesenteroides NRRL B-640 Exists as Single Homogeneous Protein: Analysis by Non-denaturing Native-PAGE\",\"authors\":\"R. K. Purama, A. Goyal\",\"doi\":\"10.5580/1b1d\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The extracellular dextransucrase from Leuconostoc mesenteroides NRRL B-640 was purified using polyethylene glycol (PEG-400) fractionation. A 25% (v/v) PEG-400 concentration gave dextransucrase with maximum specific activity of 9.2 U/mg with 16 fold purification in a single step. The purified enzyme by PEG-400 showed multiple protein bands on SDS-PAGE with one prominent band corresponding to the size 180 kDa (12). However, the same PEG-$00 fractionated dextransucrase samples showed single, intact and homogeneous band when analyzed on non-denaturing native-PAGE. This showed that dextransucrase remains in single molecular form in the native state and shows multiple forms only under denaturing conditions when it is heated before loading and when it contained SDS or 2-mercaptoethanol.\",\"PeriodicalId\":22514,\"journal\":{\"name\":\"The Internet journal of microbiology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2008-12-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The Internet journal of microbiology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.5580/1b1d\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Internet journal of microbiology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5580/1b1d","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Purified Dextransucrase from Leuconostoc mesenteroides NRRL B-640 Exists as Single Homogeneous Protein: Analysis by Non-denaturing Native-PAGE
The extracellular dextransucrase from Leuconostoc mesenteroides NRRL B-640 was purified using polyethylene glycol (PEG-400) fractionation. A 25% (v/v) PEG-400 concentration gave dextransucrase with maximum specific activity of 9.2 U/mg with 16 fold purification in a single step. The purified enzyme by PEG-400 showed multiple protein bands on SDS-PAGE with one prominent band corresponding to the size 180 kDa (12). However, the same PEG-$00 fractionated dextransucrase samples showed single, intact and homogeneous band when analyzed on non-denaturing native-PAGE. This showed that dextransucrase remains in single molecular form in the native state and shows multiple forms only under denaturing conditions when it is heated before loading and when it contained SDS or 2-mercaptoethanol.
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