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Vav, a GDP/GTP nucleotide exchange factor, interacts with GDIs, proteins that inhibit GDP/GTP dissociation
M Groysman1, C S Russek, S Katzav
1The Hubert H. Humphrey center for Experimental Medicine and Cancer Research, The Hebrew University-Hadassah Medical School, Jerusalem, Israel.
FEBS Letters
|February 9, 2000
Summary
Researchers identified Ly-GDI, a hematopoietic GDP dissociation inhibitor, interacting with the Vav protein
Area of Science:
- Molecular and Cellular Biology
- Hematopoiesis Research
- Signal Transduction
Background:
- Vav is a key GDP/GTP nucleotide exchange factor in hematopoietic cells, regulated by tyrosine phosphorylation.
- The amino-terminus of Vav is crucial for its transforming potential and T-cell function.
Purpose of the Study:
- To identify proteins interacting with the Vav amino-terminus.
- To characterize the interaction between Vav and GDP dissociation inhibitors (GDIs).
Main Methods:
- In vitro and in vivo interaction assays.
- Analysis of protein domains required for Vav-GDI interaction.
Main Results:
- Ly-GDI, a hematopoietic GDI, was identified as a Vav-interacting protein.
- Vav and Ly-GDI interact in both in vitro and in vivo settings.
- The interaction requires intact amino-terminus of Vav and carboxy-terminus of Ly-GDI, independent of Vav phosphorylation status. Rho-GDI also associates with Vav.
Conclusions:
- The interaction between Vav and Ly-GDI, and Rho-GDI, is significant for Vav's biological functions.
- Understanding Vav-GDI interactions provides insights into hematopoietic cell signaling pathways.