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Journal of Bacteriology, September 2003, p. 5234-5239, Vol. 185, No. 17
0021-9193/03/$08.00+0 DOI: 10.1128/JB.185.17.5234-5239.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.
Department of Biochemistry, Purdue University, West Lafayette, Indiana
Received 9 April 2003/ Accepted 12 June 2003
The topology of RbsC, the membrane component of the ribose transporter in Escherichia coli, has been determined by using 34 single-cysteine mutants and a modified fluorescence labeling technique designated multiplex labeling. This technique gives topology, expression, and localization information for a membrane protein from a single batch of bacterial cells. The results indicate that RbsC contains 10 transmembrane-spanning helices, with the N and C termini being in the cytosol. This topology matches predictions from the latest prediction programs and the topology of the similar, recently crystallized membrane protein BtuC.
Journal paper no. 17113 of the Purdue Agricultural Experiment Station.
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