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. 1975 Jun;122(3):880–885. doi: 10.1128/jb.122.3.880-885.1975

Facilitated transport of calcium by cells and subcellular membranes of Bacillus subtilis and Escherichia coli.

S Silver, K Toth, H Scribner
PMCID: PMC246138  PMID: 807559

Abstract

The level of calcium in growing cells is lower than that in the growth medium. Non-energy-dependent uptake of 45-Ca by log-phase cells of Bacillus subtilis occurs under two conditions: at 0 C or in the presence of m-chlorophenyl carbonylcyanide hydrazone. Similar uptake, but quantitatively less, occurs with Escherichia coli cells under the same conditions. Membrane vesicles prepared from B. subtilis or E. coli accumulate 45-Ca by a process that does not depend on added energy sources and is not inhibited by the respiratory poison cyanide. The properties of calcium transport in all cases is consistent with carrier-mediated, facilitated transport with specificity Ca-2+ greater than Sr-2+ greater than Mn-2+ greater than Mg-2+. Upon transfer of cells from 0 C to 20 C, pre-accumulated 45-Ca is released. Heat-killed cells do not accumulate 45-Ca and calcium is released by cells upon addition of toluene (under conditions that do not cause visible lysis). These results suggest that the facilitated uptake of calcium may be utilizing a transport system that normally is responsible for the energy-dependent excretion of calcium from the cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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