The Ins(1,4,5)P3 binding site of bovine adrenocortical microsomes: function and regulation

S Palmer, M J Wakelam

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13 Citations (Scopus)


Adrenocortical microsomes possess a single population of Ins(1,4,5)P3-specific binding sites [IC50 5.9 +/- 0.9 nM; Palmer, Hughes, Lee & Wakelam (1988) Cell. Signalling 1, 147-156]. Competition studies showed that Ins(1:2-cyclic,4,5)P3 exhibits a 21-fold lower affinity for the site than Ins(1,4,5)P3 (IC50 124 +/- 16 nM). The affinity of the binding sites for Ins(1,4,5)P3 was not influenced by the non-hydrolysable GTP analogues GTP gamma S and Gpp[NH]p or by preincubation of the binding protein with a preparation of partially purified protein kinase C in the presence of ATP and TPA (12-O-tetradecanoylphorbol 13-acetate). These observations are discussed with reference to the identify and function of the Ins(1,4,5)P3 binding site.

Original languageEnglish
Pages (from-to)593-596
Number of pages4
JournalBiochemical Journal
Issue number2
Publication statusPublished - 1 Jun 1989
Externally publishedYes


  • adrenal cortex
  • animals
  • binding, competitive
  • calcium channels
  • cattle
  • GTP-binding proteins
  • inositol 1,4,5-trisphosphate
  • inositol 1,4,5-trisphosphate receptors
  • inositol phosphates
  • microsomes
  • protein kinase C
  • receptors, cell surface
  • receptors, cytoplasmic and nuclear
  • sugar phosphates


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