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Co-immunoprecipitation Assay for Studying Functional Interactions Between Receptors and Enzymes
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CD16-mediated p21ras activation is associated with Shc and p36 tyrosine phosphorylation and their binding with Grb2

R Galandrini1, G Palmieri, M Piccoli

  • 1Department of Experimental Medicine and Pathology, University La Sapienza, Rome, Italy.

The Journal of Experimental Medicine
|January 1, 1996
PubMed

Insights

Adaptor proteins Grb2 and Shc mediate signaling in human natural killer cells. They link CD16 or IL-2 receptor activation to p21ras activation, crucial for cell response.

Area of Science:

  • Immunology
  • Cell Signaling
  • Molecular Biology

Background:

  • Grb2 and Shc adaptor proteins regulate p21ras activation.
  • Their role in human natural killer (NK) cell signaling via CD16 or IL-2 receptors is investigated.

Purpose of the Study:

  • To elucidate the involvement of Grb2 and Shc in NK cell signaling pathways.
  • To understand the kinetics and interactions of these proteins upon CD16 or IL-2 stimulation.

Main Methods:

  • Investigated tyrosine phosphorylation of Shc (p46 and p52 forms) after CD16 or IL-2 stimulation.
  • Performed co-immunoprecipitation assays to identify interacting proteins (Grb2, p145, p36).
  • Utilized in vitro binding assays with glutathione S-transferase-Grb2SH2 fusion protein.
  • Assessed p21ras activation by measuring guanosine triphosphate-bound Ras accumulation.

Main Results:

  • Shc proteins were rapidly tyrosine phosphorylated upon CD16/IL-2 stimulation.
  • Grb2 associated with Shc and a 145-kD phosphoprotein in Shc immunoprecipitates.
  • Grb2 immunoprecipitates contained Shc and a 36-kD phosphoprotein (p36).
  • Grb2SH2 domain mediated interactions with Shc and p36.
  • p21ras activation occurred rapidly, mirroring protein tyrosine phosphorylation and adaptor protein association.

Conclusions:

  • Grb2 and Shc are key adaptor proteins in CD16 and IL-2 receptor signaling pathways in human NK cells.
  • These proteins link receptor activation to p21ras activation, a critical step in cellular response.

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