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. 1989 Nov;171(11):6106–6116. doi: 10.1128/jb.171.11.6106-6116.1989

Chemiosmotic energy conversion of the archaebacterial thermoacidophile Sulfolobus acidocaldarius: oxidative phosphorylation and the presence of an F0-related N,N'-dicyclohexylcarbodiimide-binding proteolipid.

M Lübben 1, G Schäfer 1
PMCID: PMC210478  PMID: 2478523

Abstract

The energy-transducing mechanism of the thermoacidophilic archaebacterium Sulfolobus acidocaldarius DSM 639 has been studied, addressing the question whether chemiosmotic proton gradients serve as an intermediate energy store driving an F0F1-analogous ATP synthase. At pH 3.5, respiring S. acidocaldarius cells developed an electrochemical potential of H+ ions, consisting mainly of a proton gradient and a small inside-negative membrane potential. The steady-state proton motive force of 140 to 160 mV was collapsed by protonophores, while N,N'-dicyclohexylcarbodiimide (DCCD) caused a hyperpolarization of the membrane, as expected for a reagent commonly used to inhibit the flux through proton channels of F0F1-type ATP synthases. Cellular ATP content was strongly related to the proton motive force generated by respiration and declined rapidly, either by uncoupling or by action of DCCD, which in turn induced a marked respiratory control effect. This observation strongly supports the operation of chemiosmotic ATP synthesis with H+ as the coupling ion. The inhibition of ATP synthesis by [14C]DCCD was correlated with covalent reactions with membrane proteins. The extraction of labeled membranes with organic solvents specifically yielded a readily aggregating proteolipid of 6 to 7 kilodaltons apparent molecular mass. Its amino acid composition revealed significant similarity to the proteolipid found in eubacteria, such as Escherichia coli, as an extremely hydrophobic constituent of the F0 proton channel. Moreover, the N-terminal amino acid sequence of the Sulfolobus proteolipid displays a high degree of homology to eubacterial sequences, as well as to one derived from nucleic acid sequencing of another Sulfolobus strain (K. Denda, J. Konishi, T. Oshima, T. Date, and M. Yoshida, J. Biol. Chem. 264:7119-7121, 1989). Despite certain structural similarities between eucaryotic vacuolar ATPases and the F1-analogous ATPase from Sulfolobus sp. described earlier, the results reported here promote the view that the archaebacterial ATP-synthesizing complex functionally belongs to the F0F1 class of ATPases. These may be considered as phylogenetically conserved catalysts of energy transduction present in all kingdoms of organisms.

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Selected References

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