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An experimentally derived database of candidate Ras-interacting proteins

Lawrence E Goldfinger1, Celeste Ptak, Erin D Jeffery

  • 1Division of Rheumatology, Department of Medicine, University of California, San Diego, La Jolla, California 92093, USA. lgoldfinger@ucsd.edu

Journal of Proteome Research
|April 19, 2007
PubMed

Insights

Researchers identified proteins binding to Ras family GTPases using a TAP-tag method. H-Ras interacts with cytoskeletal proteins, while R-Ras and Rap1A bind signaling molecules, creating a database of Ras interactors.

Area of Science:

  • Molecular biology
  • Cellular signaling
  • Proteomics

Background:

  • Ras GTPases are key regulators of cellular processes.
  • Understanding their interactions is crucial for deciphering cell signaling pathways.
  • Previous interactome studies for these specific Ras proteins in mammalian cells are limited.

Purpose of the Study:

  • To identify novel binding partners for H-Ras, R-Ras, and Rap1A.
  • To establish a comprehensive database of Ras-interacting proteins in mammalian cells.
  • To differentiate interaction profiles among related Ras GTPases.

Main Methods:

  • Utilized a Tandem Affinity Purification (TAP-tag) approach in mouse fibroblasts.
  • Isolated protein complexes associated with H-Ras, R-Ras, and Rap1A.
  • Identified co-purified proteins using nanoflow High-Performance Liquid Chromatography (HPLC) and tandem mass spectrometry.

Main Results:

  • Identified numerous candidate binding proteins for H-Ras, R-Ras, and Rap1A.
  • H-Ras was found to associate with cytoskeletal proteins, including talin-1.
  • R-Ras and Rap1A associated with various membrane-associated signaling molecules.
  • Established the first database of potential Ras interactors in mammalian cells.

Conclusions:

  • The study successfully identified distinct sets of interacting proteins for H-Ras, R-Ras, and Rap1A.
  • The findings provide new insights into the specific cellular functions and pathways regulated by these Ras GTPases.
  • The generated database serves as a valuable resource for future research on Ras signaling.

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