A Novel A-Kinase Anchoring Protein in the Heart Interacts with G .ALPHA. 13.

  • SUZUKI Miwako
    Department of Cardiovascular Medicine, Hokkaido University School of Medicine, Sapporo, Japan
  • FURUUCHI Keiji
    Division of Cell Biology, Cancer Institute, Hokkaido University School of Medicine, Sapporo, Japan
  • TONOKI Hidefumi
    Division of Cell Biology, Cancer Institute, Hokkaido University School of Medicine, Sapporo, Japan
  • OZAKI Takefumi
    Department of Cardiovascular Medicine, Hokkaido University School of Medicine, Sapporo, Japan
  • IIZUKA Kenji
    Division of Cardiovascular Medicine, Department of Laboratory Medicine, Hokkaido University School of Medicine, Sapporo, Japan
  • MURAKAMI Takeshi
    Division of Cardiovascular Medicine, Department of Laboratory Medicine, Hokkaido University School of Medicine, Sapporo, Japan
  • KITABATAKE Akira
    Department of Cardiovascular Medicine, Hokkaido University School of Medicine, Sapporo, Japan
  • KAWAGUCHI Hideaki
    Division of Cardiovascular Medicine, Department of Laboratory Medicine, Hokkaido University School of Medicine, Sapporo, Japan

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抄録

A cDNA of a tentative A-kinase anchoring protein, presumably coupled with heterotrimeric GTP binding protein α 13 subunit (G α 13), was cloned from a human heart cDNA library. It was approximately 650 bases and its mRNA was expressed in the heart. Homology search of DNA sequences revealed that it was a novel cDNA with 84% homology with the partial sequence of rabbit cDNA of AKAP 120 without a stop codon. 3'-Rapid Amplification of cDNA Ends (3'-RACE) and yeast functional assay were performed to determine the 3'-end of the cDNA and ribosomal frameshifting was suggested as a translational mechanism. Here we report that a protein encoded by the cDNA may be involved in intracellular signal transduction via the G α 13 and PKA in hearts.

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