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Journal of Bacteriology, July 2000, p. 4068-4076, Vol. 182, No. 14
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Green Fluorescent Protein Functions as a Reporter
for Protein Localization in Escherichia coli
Bradley J.
Feilmeier,
Ginger
Iseminger,
Diane
Schroeder,
Hannali
Webber, and
Gregory
J.
Phillips*
Department of Microbiology, Iowa State
University, Ames, Iowa 50011
Received 18 December 1998/Accepted 19 January 2000
The use of green fluorescent protein (GFP) as a reporter for
protein localization in Escherichia coli was explored by
creating gene fusions between malE (encoding
maltose-binding protein [MBP]) and a variant of gfp
optimized for fluorescence in bacteria (GFPuv). These constructs encode
hybrid proteins composed of GFP fused to the carboxy-terminal end of
MBP. Fluorescence was not detected when the hybrid protein was
synthesized with the MBP signal sequence. In contrast, when the MBP
signal sequence was deleted, fluorescence was observed. Cell
fractionation studies showed that the fluorescent MBP-GFP hybrid
protein was localized in the cytoplasm, whereas the nonfluorescent
version was localized to the periplasmic space. Smaller MBP-GFP hybrid
proteins, however, exhibited abnormal fractionation. Expression of the
gene fusions in different sec mutants, as well as signal
sequence processing assays, confirmed that the periplasmically localized hybrid proteins were exported by the
sec-dependent pathway. The distinction between fluorescent
and nonfluorescent colonies was exploited as a scorable phenotype to
isolate malE signal sequence mutations. While expression of
hybrid proteins comprised of full-length MBP did not result in
overproduction lethality characteristic of some exported
-galactosidase hybrid proteins, synthesis of shorter, exported
hybrid proteins was toxic to the cells. Purification of MBP-GFP hybrid
protein from the different cellular compartments indicated that GFP is
improperly folded when localized outside of the cytoplasm. These
results suggest that GFP could serve as a useful reporter for genetic
analysis of bacterial protein export and of protein folding.
*
Corresponding author. Mailing address: Department of
Microbiology, Science I Bldg., Rm. 207, Iowa State University, Ames, IA
50011. Phone: (515) 294-1525. Fax: (515) 294-6019. E-mail: gregory{at}iastate.edu.

Journal Paper no. J-18214 of the Iowa Agriculture and Home
Economics Experiment Station, Ames, Iowa, project no.
IOW3220.
Journal of Bacteriology, July 2000, p. 4068-4076, Vol. 182, No. 14
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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