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1996 Fiscal Year Final Research Report Summary

Studies on ANovel Ins (1,4,5)P_3 Binding Protein Function

Research Project

Project/Area Number 08044301
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionKyushu University

Principal Investigator

HIRATA Masato  Kyushu University, Faculty of Dentisitry, Professor, 歯学部, 教授 (60136471)

Co-Investigator(Kenkyū-buntansha) MATILDA Kata  英国癌研究所, チェスター ビーティーラボラトリー, 主任研究員
MATSUDA Miho  Kyushu University, Faculty of Dentistry, Assistant Professor, 歯学部, 助手
YAGISAWA Hitoshi  Himeji Inst.Tech, Faculty of Science, Associate Professor, 理学部, 助教授 (40192380)
KATAN Matilda  Chester Beaty Laboratory, Chief Scientist
Project Period (FY) 1996
KeywordsInositol phosphates / Pleckstrin homology domain / Phospholipase / Inositol 1,4,5-trisphosphate / Phosphoinositides
Research Abstract

We isolated a new inositol 1,4,5-trisphosphate [Ins (1,4,5) P_3] binding protein with a molecular mass of 130-kDa (p130). Molecular cloning studies revealed that the protein is similar to phospholipase C-delta_1 (PLC-delta_1) but has no catalytic activity to phosphoinositides, and Thus the biological function is not yet known. To gain the insight for the function, the following studies were carried out in the present study.
1. There are several single amino acid replacements in the most likely catalytic domains, named X-and Y-domains in p130, when they compared to those of many types of PLC including PLC-delta_1. Mutant plasmids for expressing p130, in which the X-and/or Y-domains were replaced with those of PLC-delta_1, were constructed. Transfection of E.coli and subsequent assay for PLC activity will be done soon.
2. A plasmid was constructed, in which the genes encoding p130 was incorporated together with the gene for affording neomycin-resistancy. COS-1 cells were transfected with the plasmid and further cultivation in the presence of the antibiotics produced the cells which stably express p130. Modification of the cell function in response to the stimulation with bradykinin or growth factor will be examined soon, comparing non-transfected cells.
3. Plasmids containing p130 gene, but lacking various region of p130 were constructed and each plasmid was transfected into COS-1 cells in order to localize the region responsible for binding Ins (1,4,5) P_3. Cell extract lacking the pleckstrin homology domain (PH domain) of p130 failed in the binding, indicating that the PH domain is involved in the binding. The PH domain of p130 bound both Ins (1,4,5) P_3 and Ins (1,4,5,6) P_4, while that of PLC-delta_1 bound Ins (1,4,5) P_3 alone. Based on these results, we have proposed that the physiologically relevant ligands for PH domains would be inositol phosphates.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Kanematsu,T.: "A new inositol 1,4,5-trisphosphate binding protein similar to phospholipase C-δ_1" Biochem.J.313. 319-325 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Jimi,E.: "Interleukin-1α activates an NF-kB-like factor in osteoclast-like cells" J.Biol.Chem.271. 4605-4608 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takeuchi,H.: "Localization of a high affinity inositol 1,4,5-trisphosphate / inositol 1,4,5,6-tetrakisphosphate binding domain to the pleckstrin homology module of a new 130-kDa protein : characterization of the determinants of structural specificity" Biochem.J.318. 561-568 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Watanabe,Y.: "Synthesis of phosphorofluoridate analogues of myo-inositol 1,4,5-tris (phosphate) and their biological activity" J.Chem.Soc.,Chem.Commun.1996(15). 1815-1816 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirata,M.: "Intrinsic inhibitor of inositol 1,4,5-trisphosphate binding" Mol.Cel.Biochem.(in press). (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kanematsu, T.et al: "A new inositol 1,4,5-trisphosphate binding protein similar to phospholipase C-delta1" Biochem.J.313. 319-325 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jimi, E.et al: "Interleukin-1alpha activates NF-kB-like factor in osteoblast-like cells" J.Biol.Chem.271. 4605-4608 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeuchi H.et al: "Localization of a high affinity inositol 1,4,5-trisphosphate/inositol 1,4,5,6-tetrakisphospahte binding to the pleckstrin homology module of a new 130-kDa protein : characterization of the determinants of structural specificity" Biochem.J.318. 561-568 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Watanabe, Y.et al: "Synthesis of phosphofluoride analogues of myo-inositol 1,4,5-tris (phosphate) and their binding activity" J.Chem.Soc., Chem.Commun.1996 (15). 1815-1816 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirata, M.et al: "Intrinsic inhibitor of inositol 1,4,5-trisphosphate binding" Mol.Cell. Biochem.(in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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