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Presence of Host-Plasma Membrane Type H+-ATPase in the Membrane Envelope Enclosing the Bacteroids in Soybean Root Nodules

Presence of Host-Plasma Membrane Type H+-ATPase in the Membrane Envelope Enclosing the Bacteroids... Abstract An improved method is described for the isolation of membrane envelope enclosing the bacteroids (peribacteroid membrane) from soybean (Glycine max L.) root nodules. The ATPase activity of the peribacteroid membrane from infected roots is compared with that of the plasma membrane from uninfected roots. The two ATPases are similar in terms of their vanadate sensitivities, pH optima, and mineral cation requirements, and show antigenic cross-reactivity. However, the ATPase of peribacteroid membrane is more sensitive to stimulation by NH4+. ATP-dependent proton translocation across the peribacteroid membrane was demonstrated in broken protoplasts of infected cells, by the use of fluorescence microscopy with acridine orange. It is suggested that acidification of the peribacteroid space by the peribacteroid membrane ATPase results in the conversion of NH3 to NH4+ in this space and thereby facilitates the removal of fixed-nitrogen from the bacteroid. 1 Supported by research grants from the Natural Science and Engineering Research Council of Canada and the Department of Education of Quebec to D. P. S. V. and R. J. P. 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) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Physiology Oxford University Press

Presence of Host-Plasma Membrane Type H+-ATPase in the Membrane Envelope Enclosing the Bacteroids in Soybean Root Nodules

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References (26)

Publisher
Oxford University Press
Copyright
Copyright © 2021 American Society of Plant Biologists
ISSN
0032-0889
eISSN
1532-2548
DOI
10.1104/pp.78.4.665
Publisher site
See Article on Publisher Site

Abstract

Abstract An improved method is described for the isolation of membrane envelope enclosing the bacteroids (peribacteroid membrane) from soybean (Glycine max L.) root nodules. The ATPase activity of the peribacteroid membrane from infected roots is compared with that of the plasma membrane from uninfected roots. The two ATPases are similar in terms of their vanadate sensitivities, pH optima, and mineral cation requirements, and show antigenic cross-reactivity. However, the ATPase of peribacteroid membrane is more sensitive to stimulation by NH4+. ATP-dependent proton translocation across the peribacteroid membrane was demonstrated in broken protoplasts of infected cells, by the use of fluorescence microscopy with acridine orange. It is suggested that acidification of the peribacteroid space by the peribacteroid membrane ATPase results in the conversion of NH3 to NH4+ in this space and thereby facilitates the removal of fixed-nitrogen from the bacteroid. 1 Supported by research grants from the Natural Science and Engineering Research Council of Canada and the Department of Education of Quebec to D. P. S. V. and R. J. P. 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 PhysiologyOxford University Press

Published: Aug 1, 1985

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