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The RIN family of Ras effectors

Joanne M Bliss1, Byrappa Venkatesh, John Colicelli

  • 1Department of Biological Chemistry, University of California Los Angeles School of Medicine, Los Angeles, California, USA.

Methods in Enzymology
|June 8, 2006
PubMed

Insights

The RIN1 gene acts as a RAS effector, influencing cell processes like endocytosis and ABL kinase activity. Activated RAS enhances these RIN1 functions, revealing its role in two independent signaling pathways.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Genetics

Background:

  • The RIN1 gene was initially identified through its interaction with RAS-induced phenotypes in yeast.
  • Further studies revealed RIN1 as a downstream effector of RAS, specifically binding to activated HRAS.

Purpose of the Study:

  • To investigate the biochemical and biological functions of the human RIN1 gene.
  • To elucidate the distinct signaling pathways regulated by RIN1.

Main Methods:

  • Yeast-based assays for identifying gene function.
  • Biochemical assays to study protein-protein interactions (RIN1 and HRAS).
  • Cellular assays to evaluate endocytosis and kinase activity.

Main Results:

  • RIN1 directly activates RAB5-mediated endocytosis.
  • RIN1 directly activates ABL tyrosine kinase.
  • Both RIN1 functions are enhanced by activated RAS, indicating a unique effector role.

Conclusions:

  • RIN1 is a novel RAS effector connecting to two independent pathways: endocytosis and ABL kinase signaling.
  • RIN1's functions are modulated by RAS activation, highlighting its significance in cellular regulation.

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