@article {847,
	title = {Cyclic enterobacterial common antigen: Potential contaminant of bacterially expressed protein preparations},
	journal = {Journal of Biomolecular Nmr},
	volume = {29},
	number = {2},
	year = {2004},
	note = {ISI Document Delivery No.: 801ZPTimes Cited: 5Cited Reference Count: 10},
	month = {Jun},
	pages = {199-204},
	type = {Article},
	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.},
	keywords = {enterobacterial common antigen, ESCHERICHIA-COLI, heterologous protein expression, IDENTIFICATION, N-acetylated carbohydrate, NMR-SPECTROSCOPY, protein purification},
	isbn = {0925-2738},
	url = {<Go to ISI>://000220134100007},
	author = {Erbel, P. J. A. and Seidel, R. and Macintosh, S. E. and Gentile, L. N. and Amor, J. C. and Kahn, R. A. and Prestegard, J. H. and McIntosh, L. P. and Gardner, K. H.}
}
