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- W1968227570 abstract "In the cellular slime mold Dictyostelium discoideum, changes in free cytosolic Ca2+ are thought to regulate certain processes during cell aggregation and differentiation. To understand the mechanisms controlling free Ca2+ levels in this organism, we previously isolated and characterized an ATPMg2+-dependent, high-affinity Ca2+ pump which appeared to be a component of “inside-out” plasma membrane vesicles [J. L. Milne and M. B. Coukell (1988)Biochem. J.249, 223–230]. In this report, we demonstrate that a high-affinity Ca2+ pump, with properties virtually identical to the isolated pump, can be detected in filipin- or digitonin-permeabilized cells of Dictyostelium. Moreover, Ca2+-pumping vesicles, which migrate on Percoll/KCl gradients like the vesicles identified earlier, can be isolated from the permeabilized cells. Results of additional experiments suggest that this intracellular Ca2+ transporter is associated with a high-capacity non-IP3-releasable Ca2+ store which is generated by endocytosis. A possible role for this store in maintaining Ca2+ homeostasis in Dictyostelium is discussed." @default.
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- W1968227570 date "1989-11-01" @default.
- W1968227570 modified "2023-09-25" @default.
- W1968227570 title "Identification of a high-affinity Ca2+ pump associated with endocytotic vesicles in Dictyostelium discoideum" @default.
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- W1968227570 doi "https://doi.org/10.1016/0014-4827(89)90033-5" @default.
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