Journal
CHEMBIOCHEM
Volume 4, Issue 5, Pages 396-405Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbic.200200530
Keywords
autodisplay; fluorescence; maleimide; Michael addition; protein engineering
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A general method is described that allows one to follow the surface display of recombinant proteins in Escherichia coli without having to use specific antibodies or enzymatic reactions. The method is based on cysteine-specific labeling through Michael addition to the double bond of maleimide and its derivatives, and takes advantage of the fact that naturally occurring surface proteins in E. coli contain no accessible cysteine residues. The method is easy to perform and could be simply applied to different analytic procedures including Western blot, spectral photometry, and flow cytometry. By using this new labeling method, single cells bearing a distinct protein at the surface could be selected by fluorescence-activated cell sorting. The data were obtained by using autodisplay, an efficient surface display were obtained by using autodisplay an efficient surface display system established for E. coli but the method presented here represents rather a general solution for analyzing the surface display of recombinant proteins independent of the cellular system used.
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