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Related Experiment Videos

Identification of the GTP-binding protein encoded by Gi3 complementary DNA.

P Goldsmith1, K Rossiter, A Carter

  • 1Metabolic Diseases Branch, National Institute of Diabetes, Digestive, and Kidney Diseases, Bethesda, Maryland 20892.

The Journal of Biological Chemistry
|May 15, 1988
PubMed
Summary

Three distinct guanine nucleotide-binding proteins (G-proteins) were identified using cDNA sequences. Specific antibodies confirmed that the 41-kDa G-protein from HL-60 cells is different from the brain G-protein, suggesting it is encoded by Gi3 cDNA.

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Area of Science:

  • Molecular Biology
  • Cellular Signaling

Background:

  • Guanine nucleotide-binding proteins (G-proteins) are crucial for cellular signal transduction.
  • Three closely related G-protein subtypes (Gi1, Gi2, Gi3) are encoded by distinct cDNAs.

Purpose of the Study:

  • To differentiate between closely related G-protein subtypes.
  • To identify the specific G-protein encoded by Gi3 cDNA.

Main Methods:

  • In vitro translation of G-protein cDNAs (Gi1, Gi2, Gi3).
  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) to determine protein molecular weights.
  • Antisera generation against synthetic peptides from G-protein sequences.
  • Immunoblot analysis to test antibody reactivity with purified G-proteins from brain and HL-60 cells.

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Main Results:

  • In vitro translated products migrated as 41-kDa (Gi1), 40-kDa (Gi2), and 41-kDa (Gi3) proteins.
  • Antisera specific to Gi1, Gi2, and Gi3 peptides showed distinct reactivity patterns with purified G-proteins.
  • LD antisera (Gi1) reacted only with brain G41; LE antisera (Gi2) reacted only with brain G40; SQ antisera (Gi3) reacted exclusively with HL-60 G41.

Conclusions:

  • The 41-kDa G-protein purified from HL-60 cells is distinct from the 41-kDa G-protein found in the brain.
  • The HL-60 cell G-protein likely corresponds to the protein encoded by the Gi3 cDNA.