Galectin-1 is a novel structural component and a major regulator of H-Ras nanoclusters

Liron Belanis, Sarah J. Plowman, Barak Rotblat, John F. Hancock, Yoel Kloog

Research output: Contribution to journalArticlepeer-review

110 Scopus citations

Abstract

The organization of Ras proteins into nanoclusters on the inner plasma membrane is essential for Ras signal transduction, but the mechanisms that drive nanoclustering are unknown. Here we show that epidermal growth factor receptor activation stimulates the formation of H-Ras.GTP-Galectin-1 (Gal-1) complexes on the plasma membrane that are then assembled into transient nanoclusters. Gal-1 is therefore an integral structural component of the H-Ras-signaling nanocluster. Increasing Gal-1 levels increases the stability of H-Ras nanoclusters, leading to enhanced effector recruitment and signal output. Elements in the H-Ras C-terminal hypervariable region and an activated G-domain are required for H-Ras-Gal-1 interaction. Palmitoylation is not required for H-Ras-Gal-1 complex formation, but is required to anchor H-Ras-Gal-1 complexes to the plasma membrane. Our data suggest a mechanism for H-Ras nanoclustering that involves a dual role for Gal-1 as a critical scaffolding protein and a molecular chaperone that contributes to H-Ras trafficking by returning depalmitoylated H-Ras to the Golgi complex for repalmitoylation.

Original languageEnglish
Pages (from-to)1404-1414
Number of pages11
JournalMolecular Biology of the Cell
Volume19
Issue number4
DOIs
StatePublished - 1 Apr 2008
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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