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  • Title: Bacterial calcium transport: energy-dependent calcium uptake by membrane vesicles from Bacillus megaterium.
    Author: Golub EE, Bronner F.
    Journal: J Bacteriol; 1974 Sep; 119(3):840-3. PubMed ID: 4211830.
    Abstract:
    Membrane vesicles capable of energy-dependent calcium uptake have been prepared from Bacillus megaterium cells in log-phase growth or when undergoing sporulation. The uptake is dependent on the calcium concentration and appears saturable in vesicles from cells in log-phase growth. Both ascorbate and phenazine methosulfate are needed as a source of electrons for the energy-dependent increase in calcium uptake. Addition of 8 mM sodium cyanide inhibited the energy-dependent uptake. If this calcium uptake mechanism is a component of the sporulation-specific calcium accumulation process, the latter's functional expression would appear to be inhibited during log-phase growth.
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