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Cyclic enterobacterial common antigen: Potential contaminant of bacterially expressed protein preparations

TitleCyclic enterobacterial common antigen: Potential contaminant of bacterially expressed protein preparations
Publication TypeJournal Article
Year of Publication2004
AuthorsErbel, PJA, Seidel, R, Macintosh, SE, Gentile, LN, Amor, JC, Kahn, RA, Prestegard, JH, McIntosh, LP, Gardner, KH
JournalJournal of Biomolecular Nmr
Volume29
Pagination199-204
Date PublishedJun
Type of ArticleArticle
ISBN Number0925-2738
Keywordsenterobacterial common antigen, ESCHERICHIA-COLI, heterologous protein expression, IDENTIFICATION, N-acetylated carbohydrate, NMR-SPECTROSCOPY, protein purification
Abstract

We have previously reported the identification of the cyclic enterobacterial common antigen (ECACYC) polysaccharide in E. coli strains commonly used for heterologous protein expression (PJA Erbel et al., J. Bacteriol. 185 ( 2003): 1995). Following this initial report, interactions among several NMR groups established that characteristic N-acetyl signals of ECACYC have been observed in N-15-H-1 HSQC spectra of samples of various bacterially-expressed proteins suggesting that this water-soluble carbohydrate is a common contaminant. We provide NMR spectroscopic tools to recognize ECACYC in protein samples, as well as several methods to remove this contaminant. Early recognition of ECA-based NMR signals will prevent time-consuming analyses of this copurifying carbohydrate.

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