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- W119765585 abstract "Accumulation of Ca2+ in Bacilli occurs during stages IV to VI of sporulation. Ca2+ uptake into the sporangium was investigated in Bacillus megaterium KM in protoplasts prepared in stage III of sporulation and cultured to continue sporulation. These protoplasts and whole cells exhibit essentially identical Ca2+ uptake, which is compared with that of forespores isolated in stage V of sporulation. Ca2+, uptake into both sporangial protoplasts and isolated forespores occurs by Ca2+-specific carrier-mediated processes. However, protoplasts exhibit a Km value of 31 micrometer, and forespores have a Km value of 2.1 mM. Sporangial protoplasts accumulate Ca2+ against a concentration gradient. In contrast, Ca2+ uptake into isolated forespores is consistent with downhill transfer in which both rate and extent of uptake are affected by the external Ca2+ concontration. Dipicolinic acid has no effect on Ca2+ uptake by isolated forespores, apart from decreasing the external Ca2+ concentration by chelation. A model for sporulation-specific Ca2+ accumulation is proposed, in which Ca2+ is transported into the sporangium, resulting in a concentration of 3–9 mM in the mother-cell cytoplasm. This high concentration of Ca2+ enables carrier-mediated transfer down a concentration gradient into the forespore compartment, where a low free Ca2+ concentration is maintained by complexing with dipicolinic acid." @default.
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- W119765585 date "1978-10-15" @default.
- W119765585 modified "2023-09-25" @default.
- W119765585 title "Calcium accumulation during sporulation of <i>Bacillus megaterium</i> KM" @default.
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- W119765585 doi "https://doi.org/10.1042/bj1760197" @default.
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