PRIP, a Novel Ins(1,4,5)P3 Binding Protein, Functional Significance in Ca2+ Signaling and Extension to Neuroscience and Beyond

  • Kanematsu, Takashi (Laboratory of Molecular and Cellular Biochemistry, Faculty of Dental Science and Station for Collaborative Research, Kyushu University) ;
  • Takeuchi, Hiroshi (Laboratory of Molecular and Cellular Biochemistry, Faculty of Dental Science and Station for Collaborative Research, Kyushu University) ;
  • Terunuma, Miho (Laboratory of Molecular and Cellular Biochemistry, Faculty of Dental Science and Station for Collaborative Research, Kyushu University) ;
  • Hirata, Masato (Laboratory of Molecular and Cellular Biochemistry, Faculty of Dental Science and Station for Collaborative Research, Kyushu University)
  • Received : 2005.11.04
  • Accepted : 2005.11.06
  • Published : 2005.12.31


Investigation of chemically synthesized inositol 1,4,5-trisphosphate [$Ins(1,4,5)P_3$] analogs has led to the isolation of a novel binding protein with a molecular size of 130 kDa, characterized as a molecule with similar domain organization to phospholipase C-${\delta}1$ (PLC-${\delta}1$) but lacking the enzymatic activity. An isoform of the molecule was subsequently identified, and these molecules have been named PRIP (PLC-related, but catalytically inactive protein), with the two isoforms named PRIP-1 and -2. Regarding its ability to bind $Ins(1,4,5)P_3$ via the pleckstrin homology domain, the involvement of PRIP-1 in $Ins(1,4,5)P_3$-mediated $Ca^{2+}$ signaling was examined using COS-1 cells overexpressing PRIP-1 and cultured neurons prepared from PRIP-1 knock-out mice. Yeast two hybrid screening of a brain cDNA library using a unique N-terminus as bait identified GABARAP ($GABA_A$ receptor associated protein) and PP1 (protein phosphatase 1), which led us to examine the possible involvement of PRIP in $GABA_A$ receptor signaling. For this purpose PRIP knock-out mice were analyzed for $GABA_A$ receptor function in relation to the action of benzodiazepines from the electrophysiological and behavioral aspects. During the course of these experiments we found that PRIP also binds to the b-subunit of $GABA_A$ receptors and PP2A (protein phosphtase 2A). Here, we summarize how PRIP is involved in $Ins(1,4,5)P_3$-mediated $Ca^{2+}$ signaling and $GABA_A$ receptor signaling based on the characteristics of binding molecules.


Calcium;$GABA_A$ Receptor;GABARAP;$Ins(1,4,5)P_3$;KO Mice;PH Domain;Phosphatase


Supported by : MEXT of Japan


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