Only one gene is required for the glpT-dependent transport of sn-glycerol-3-phosphate in Escherichia coli |
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| Authors: | D Ludtke T J Larson C Beck W Boos |
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| Institution: | (1) Fakultät für Biologie, Universität Konstanz, Postfach 5560, D-7750 Konstanz, Federal Republic of Germany;(2) Present address: Massachussetts Institute of Technology, 02139 Cambridge, MA, USA;(3) Present address: Institut für Biologie III, Universität Freiburg, Schänzlestr. 1, D-7800 Freiburg, FRG |
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| Abstract: | Summary Deletion and point mutants defective in the glpT-dependent sn-glycerol-3-phosphate transport system were isolated and located on the Escherichia coli chromosome. They mapped in glpT in the clockwise order gyrA, glpA, glpT at around 48 min on the Escherichia coli linkage map. The mutations within glpT were ordered by deletion mapping, three factor crosses, and by crosses involving  transducing bacteriophages carrying glpT-lac operon fusions. Results obtained using these fusion phages indicated that glpT is transcribed in the counterclockwise direction on the E. coli linkage map.Complementation analysis using these mutants revealed only one complementation group. Thus, one gene is necessary and sufficient for the proton motive force-dependent sn-glycerol-3-phosphate transport system. |
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