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- W1572632194 abstract "Abstract The distribution of binding sites for the calcium-mobilizing second messenger inositol 1,4,5-trisphosphate (Ins(1,4,5)P3) was investigated in subcellular fractions of bovine adrenal cortex. The [3H]Ins(1,4,5)P3-binding capacity was enriched in the microsomal fraction, which contained a single class of high affinity binding sites with a Kd of 21.6 +/- 3.0 nM. The specific [3H]Ins(1,4,5)P3 binding appeared to be sharply pH dependent and was inhibited by millimolar concentrations of ATP. Upon fractionation of microsomes on sucrose density gradient there was a clearcut separation of the Ins(1,4,5)P3 receptor-containing fractions from those enriched in specific endoplasmic reticulum markers such as sulfatase C activity or RNA content. The microsomes enriched in Ins(1,4,5)P3-binding sites were of lower density than the endoplasmic reticulum and co-purified partly with the plasma membrane. In addition, Ins(1,4,5)P3-sensitive 45Ca2+ uptake into the microsomes was maximal in the lighter fractions. This distinction between Ins(1,4,5)P3-binding sites and endoplasmic reticulum-derived microsomes was confirmed upon fractionation according to their electrophoretic mobilities by free flow electrophoresis. These results indicate that in adrenal cortical cells, the source of Ca2+ mobilized by Ins(1,4,5)P3 upon stimulation with an agonist is not located in the endoplasmic reticulum. Our data support the hypothesis that a specialized vesicular organelle, distinct from endoplasmic reticulum and in close apposition with the plasma membrane, is involved in intracellular Ca2+ homeostasis." @default.
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- W1572632194 date "1989-08-01" @default.
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- W1572632194 title "The Inositol 1,4,5-Trisphosphate-binding Site in Adrenal Cortical Cells Is Distinct from the Endoplasmic Reticulum" @default.
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- W1572632194 doi "https://doi.org/10.1016/s0021-9258(18)71645-1" @default.
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