UNSPECIFIED (2003) Quantitative export of a reporter protein, GFP, by the twin-arginine translocation pathway in Escherichia coli. BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 304 (2). pp. 279-284. ISSN 0006-291X

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Abstract

The Tat system mediates the transport of folded proteins across the bacterial cytoplasmic membrane. To study the properties of the Escherichia coli Tat-system, we used green fluorescent protein (GFP) fused to the twin-arginine signal peptide of TMAO reductase (TorA). In the presence of arabinose, low levels of this protein rapidly saturate the translocase and cause the accumulation of inactive, membrane-bound TorA-GFP; fluorescence microscopy also showed active TorA-GFP to be distributed throughout the cytoplasm. However, the efficiency of export can be massively increased by alteration of the growth conditions, and further increased by overexpression of the tatABC genes. Under these conditions, the levels of GFP in the periplasm are raised over 20-fold and the export efficiency nears 100%. These results show that the Tat-system is relatively inactive under some growth conditions and the data suggest that the system may be applicable for the larger-scale export of heterologous proteins. (C) 2003 Elsevier Science (USA). All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QH Natural history > QH301 Biology
Journal or Publication Title:	BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
ISSN:	0006-291X
Date:	2 May 2003
Volume:	304
Number:	2
Number of Pages:	6
Page Range:	pp. 279-284
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9773

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