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. 1985 Sep;4(9):2357–2363. doi: 10.1002/j.1460-2075.1985.tb03939.x

Proton conduction by subunit a of the membrane-bound ATP synthase of Escherichia coli revealed after induced overproduction.

K von Meyenburg, B B Jørgensen, O Michelsen, L Sørensen, J E McCarthy
PMCID: PMC554510  PMID: 2866956

Abstract

Transcriptional fusions between the phage lambda promotor pR and ATP synthase genes, atp, on plasmid pBR322 were constructed in order to study the effects upon growth and physiology of Escherichia coli of induced overproduction of H+-ATPase subunits. Constitutive overproduction of the complete enzyme had earlier been found to result in decreased growth rate and cytological defects. When a 15-fold overproduction of subunit a alone, or together with subunit c, or with all other ATP synthase subunits was suddenly induced, the following effects were observed. Inhibition of growth and protein synthesis within 10 min of induction, which effect was suppressed by N,N'-dicyclohexylcarbodiimide, also when the chromosomal atp genes coding for the Fo subunits a, b and c were deleted. Partial collapse of the membrane potential delta psi at 4-6 min after induction paralleled by inhibition of thiomethylgalactoside and guanosine transport. Respiration and alpha-methylglucoside transport was not affected. The partial collapse of delta psi, and the specific inhibition of proton-driven transport systems is taken to show that the subunit a has--when suddenly overproduced and inserted into the membrane--a protonophoric activity. It is suggested that this protonophoric activity of subunit a is related to the function of this subunit in the Fo sector in H+-ATPases.

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Selected References

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