Divalent cation transport systems of Rhodopseudomonas capsulata.

Journal of Bacteriology
P Jasper, S Silver

Abstract

Separate divalent cation transport systems for energy-dependent uptake of Mg2+ and Mn2+ were found both with aerobically and heterotrophically grown and with photosynthetically grown cells of Rhodopseudomonas capsulata. The maximum rate of Mg2+ uptake differed between photosynthetic and aerobic cells, while the Km for the Mg2+ transport system was constant. Photosynthetic midlog-phase cells exhibited Km's for uptake of about 55 micrometer Mg2+ and 0.5 micrometer Mn2+. The Vmax's also differed between the two systems: 0.6 to 1.8 mumol/min per g (dry weight) of cells for Mg2+, but only 0.020 mumol/min per g for Mn2+, making the distinction between a "macro-requirement" system and a system functioning at trace nutrient levels. Calcium was not normally taken up by intact cells of R. capsulata. However, chromatophore membranes isolated from photosynthetic cells took up Ca2+ by an energy-dependent process.

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Citations

Aug 20, 1990·FEBS Letters·A Romani, A Scarpa
Jan 1, 1984·The Journal of Membrane Biology·P W Flatman
Oct 18, 1996·The Journal of Biological Chemistry·V V Bartsevich, H B Pakrasi
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Mar 1, 1978·Journal of Bacteriology·P Jasper
Apr 27, 1987·Biochimica Et Biophysica Acta·B P Rosen

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