Similarity of lysosomal H+-ATPase to mitochondrial F0F1-ATPase in sensitivity to anions and drugs as revealed by solubilization and reconstitution

Yoshinori Moriyama, Tatsuya Takano, Shoji Ohkuma

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Lysosomal H+-translocating ATPase (H+-ATPase) was solubilized with lysophosphatidylcholine and reconstituted into liposomes (Moriyama, Y., Takano, T. and Ohkuma, S. (1984) J. Biochem. (Tokyo) 96, 927-930). In this study, the sensitivities of membrane-bound, solubilized and liposome-incorporated ATPase to various anions and drugs were measured in comparison with those of similar forms of mitochondrial H+-ATPase (mitochondrial F0F1-ATPase) with the following results. (1) Bicarbonate and sulfite activated solubilized lysosomal H+-ATPase, but not the membrane-bound ATPase or ATPase incorporated into liposomes. All three forms of mitochondrial F0F1-ATPase were activated by these anions. (2) All three forms of both lysosomal H+-ATPase and mitochondrial F0F1-ATPase were strongly inhibited by SCN-, NO3- and F-, but scarcely affected by Cl-, Br- and SO42-. (3) The solubilized lysosomal H+-ATPase was strongly inhibited by azide, quercetin, 7-chloro-4-nitrobenzo-2-oxa-1,3-diazole (NBD-Cl), 4-acetamido-4′-isothiocyanatostilbene-2,2′-disulfonic acid (SITS), 4,4′-diisothiocyanatostilbene-2,2′-disulfonic acid (DIDS) and oligomycin. Its sensitivity was almost the same as that of mitochondrial F0F1-ATPase. Neither membrane-bound ATPase nor ATPase incorporated into liposomes was affected appreciably by these drugs. These results indicate that the sensitivity to anions and drugs of lysosomal H+-ATPase depends on the form of the enzyme and that the sensitivity of the solubilized lysosomal H+-ATPase is very similar to that of mitochondrial F0F1-ATPase. On the other hand, the two ATPases differ in their sensitivity to N-ethylmaleimide and pyridoxal phosphate: only the mitochondrial ATPase is inhibited by pyridoxal phosphate whereas only the lysosomal ATPase is inhibited by N-ethylmaleimide.

Original languageEnglish
Pages (from-to)102-108
Number of pages7
JournalBBA - Biomembranes
Volume854
Issue number1
DOIs
Publication statusPublished - Jan 16 1986

Keywords

  • (Rat liver)
  • Anion sensitivity
  • FF-ATPase
  • H-ATPase
  • Membrane reconstitution

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

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