Regulation of Proton Diffusion Pathways in Chloroplast Thylakoids by Ca++ Gating

Dilley, Richard A.; Chiang, Gisela G.

doi:10.1007/978-1-4684-8029-0_23

Plasma Membrane Oxidoreductases in Control of Animal and Plant Growth 1988

DOI: 10.1007/978-1-4684-8029-0_23

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Regulation of Proton Diffusion Pathways in Chloroplast Thylakoids by Ca++ Gating

Richard A. Dilley¹,

Gisela G. Chiang²

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1989

1991

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Cited by 2 publications

References 14 publications

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Electron and proton transport across the plasma membrane

Crane

Sun

Barr

et al. 1991

J Bioenerg Biomembr

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Transplasm membrane electron transport in both plant and animal cells activates proton release. The nature and components of the electron transport system and the mechanism by which proton release is activated remains to be discovered. Reduced pyridine nucleotides are substrates for the plasma membrane dehydrogenases. Both plant and animal membranes have unusual cyanide-insensitive oxidases so oxygen can be the natural electron acceptor. Natural ferric chelates or ferric transferrin can also act as electron acceptors. Artificial, impermeable oxidants such as ferricyanide are used to probe the activity. Since plasma membranes contain b cytochromes, flavin, iron, and quinones, components for electron transport are present but their participation, except for quinone, has not been demonstrated. Stimulation of electron transport with impermeable oxidants and hormones activates proton release from cells. In plants the electron transport and proton release is stimulated by red or blue light. Inhibitors of electron transport, such as certain antitumor drugs, inhibit proton release. With animal cells the high ratio of protons released to electrons transferred, stimulation of proton release by sodium ions, and inhibition by amilorides indicates that electron transport activates the Na+/H+ antiport. In plants part of the proton release can be achieved by activation of the H+ ATPase. A contribution to proton transfer by protonated electron carriers in the membrane has not been eliminated. In some cells transmembrane electron transport has been shown to cause cytoplasmic pH changes or to stimulate protein kinases which may be the basis for activation of proton channels in the membrane. The redox-induced proton release causes internal and external pH changes which can be related to stimulation of animal and plant cell growth by external, impermeable oxidants or by oxygen.

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Electron and proton transport across the plasma membrane

Crane

Sun

Barr

et al. 1991

J Bioenerg Biomembr

View full text Add to dashboard Cite

show abstract

Plasma membrane oxidoreductases

Crane

Barr

1989

Critical Reviews in Plant Sciences

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Regulation of Proton Diffusion Pathways in Chloroplast Thylakoids by Ca++ Gating

Cited by 2 publications

References 14 publications

Electron and proton transport across the plasma membrane

Electron and proton transport across the plasma membrane

Plasma membrane oxidoreductases

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