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J Am Chem Soc. 2010 Jan 13;132(1):321-7.

Protein (19)F NMR in Escherichia coli.

Li C, Wang GF, Wang Y, Creager-Allen R, Lutz EA, Scronce H, Slade KM, Ruf RA, Mehl RA, Pielak GJ.

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Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.

Abstract

Although overexpression and (15)N enrichment facilitate the observation of resonances from disordered proteins in Escherichia coli, (15)N enrichment alone is insufficient for detecting most globular proteins. Here, we explain this dichotomy and overcome the problem while extending the capability of in-cell NMR by using (19)F-labeled proteins. Resonances from small (approximately 10 kDa) globular proteins containing the amino acid analogue 3-fluoro-tyrosine can be observed in cells, but for larger proteins the (19)F resonances are broadened beyond detection. Incorporating the amino acid analogue trifluoromethyl-L-phenylalanine allows larger proteins (up to 100 kDa) to be observed in cells. We also show that site-specific structural and dynamic information about both globular and disordered proteins can be obtained inside cells by using (19)F NMR.

PMID:: 20050707; [PubMed - indexed for MEDLINE]
PMCID:: PMC2815348

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