Proton movements coupled to lactate and alanine transport in Escherichia coli: isolation of mutants with altered stoichiometry in alanine transport.

Journal of Bacteriology
S H CollinsW A Hamilton

Abstract

The addition of lactate to lightly buffered suspensions of resting cells of Escherichia coli caused an increase in the pH of the extracellular phase as lactate and protons entered the cell together. From the magnitude of the pH change and the non-electrogenic character of lactate uptake, we concluded that the stoichiometry of the process was 1 proton/lactate anion. The addition of alanine caused a slow increase in pH, also apparently due to the transport of the amino acid by a symport mechanism with 1 proton/alanine stoichiometry. When cells were grown in the chemostat with alanine as sole carbon source and as limiting nutrient, this stoichiometry was found to alter to 2 protons/alanine, and then to 4 protons/alanine. These increases stoichiometries were due to the selection of mutants. The consequences of these changes on the potential uptake capacity of the cells are discussed.

References

Jun 1, 1976·Journal of Bacteriology·S H Collins, W A Hamilton
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Citations

May 1, 1978·FEBS Letters·M A Tarshis, A B Kapitanov
Mar 26, 1984·FEBS Letters·T TsuchiyaT Kawasaki
Jan 1, 1980·Membrane Biochemistry·T TsuchiyaT H Wilson
Jan 12, 2002·Biochemical and Biophysical Research Communications·María Felisa NúñezEdmund C C Lin
Mar 1, 1980·Journal of Bacteriology·K TanakaT Tsuchiya
Jun 1, 1983·Microbiological Reviews·D E Dykhuizen, D L Hartl
Nov 1, 1983·Applied and Environmental Microbiology·M G Höfle
Sep 1, 1977·Journal of Bacteriology·S E Dills, W J Dobrogosz
Dec 11, 1987·Biochimica Et Biophysica Acta·H HamaT Tsuchiya
Oct 5, 1977·Biochimica Et Biophysica Acta·P John, F R Whatley
Jun 2, 1978·Biochimica Et Biophysica Acta·M C StephensonE A Dawes
May 27, 1980·Biochimica Et Biophysica Acta·I C West
Jun 1, 1976·Journal of Bacteriology·S H Collins, W A Hamilton
Sep 1, 1980·Microbiological Reviews·S S DillsM H Saier
May 1, 1988·Journal of Bacteriology·H HamaT Tsuchiya
Feb 8, 1991·Biochimica Et Biophysica Acta·P A Dibrov
Apr 14, 1978·Biochemical and Biophysical Research Communications·D O Silva, W J Dobrogosz

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