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R. Poole (1978)
Energy Coupling for Membrane TransportAnnual Review of Plant Biology, 29
- Publisher
- Oxford University Press
- Copyright
- Copyright © 2021 American Society of Plant Biologists
- ISSN
- 0032-0889
- eISSN
- 1532-2548
- DOI
- 10.1104/pp.77.1.46
- Publisher site
- See Article on Publisher Site
Abstract
Abstract The substrate and ionic requirements of ATP and inorganic pyrophosphate (PPi) hydrolysis by tonoplast vesicles isolated from storage tissue of red beet (Beta vulgaris L.) were compared with the requirements of ATP-and PPi-dependent proton translocation by the same material. Both ATP hydrolysis and ATP-dependent proton translocation are most stimulated by Cl− and inhibited by NO3−. NaCl and KCl support similar rates of ATP hydrolysis and ATP-dependent proton translocation while K2SO4 supports lesser rates for both. PPi hydrolysis and PPi-dependent proton translocation are most stimulated by K+. KCl and K2SO4 support similar rates of PPi hydrolysis and PPi-dependent proton translocation but NaCl has only a small stimulatory effect on both. Since PPi does not inhibit ATP hydrolysis and ATP does not interfere with PPi hydrolysis, it is inferred that the two phosphohydrolase and proton translocation activities are mediated by different tonoplast-associated enzymes. The results indicate the presence of an energy-conserving proton-translocating pyrophosphatase in the tonoplast of red beet. 1 Supported by the Natural Sciences and Engineering Research Council of Canada and the Department of Education of Quebec. This content is only available as a PDF. © 1985 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Journal
Plant Physiology – Oxford University Press
Published: Jan 1, 1985