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Plant Physiology 84:25-30 (1987)
© 1987 American Society of Plant Biologists

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Membranes and Bioenergetics

Proton Gradients in Intact Cyanobacteria 1

Shimshon Belkin2, Rolf J. Mehlhorn and Lester Packer

Membrane Bioenergetics Group, Department of Physiology-Anatomy, University of California, Berkeley, California 94720, Applied Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

The internal pH values of two unicellular cyanobacterial strains were determined with electron spin resonance probes, over an external pH range of 6 to 9, in the light and in the dark. The slow growing, thylakoid-lacking Gloeobacter violaceus was found to have a low capacity for maintaining a constant internal pH. The distribution pattern of weak acid and amine nitroxide spin probes across the cell membranes of this organism, in the light and in the dark, was consistent with the assumption that it contains a single intracellular compartment. At an external pH of 7.0, intracellular pH was 6.8 in the dark and 7.2 in the light. The cells of Agmenellum quadruplicatum, a marine species, were found to contain two separate compartments; in the dark, the pH of the cytoplasmic and the intrathylakoid spaces were calculated to be 7.2 and 5.5, respectively. Upon illumination, the former increased and the latter decreased by about 0.5 pH units.

2 Present address: Environmental Applied Microbiology, The Jacob Blaustein Institute for Desert Research, Ben Gurion University, Sede Boqer Campus, 84990, Israel.

1 Supported by the National Institute of Health grant AG-04818, by the Department of Energy (grants DE-ATO380-ER10637 and DE-AC03-76SF00098), and by National Aeronautics and Space Administration grant A-14563C.




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