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A murine CDC25/ras-GRF-related protein implicated in Ras regulation
1Banting and Best Department of Medical Research, University of Toronto, Ontario, Canada.
Developmental Genetics
|January 1, 1993
Summary
Researchers identified GRF2, a novel ras guanine nucleotide release-inducing factor (GRF). This widely expressed protein is highly related to CDC25Mm/ras-GRF and may regulate early mouse development.
Area of Science:
- Molecular Biology
- Cellular Signaling
Background:
- Ras proteins are key regulators of cellular processes.
- Ras guanine nucleotide release-inducing factors (GRFs) activate Ras proteins.
- A novel GRF, termed GRF2, was investigated for its role in cellular signaling.
Purpose of the Study:
- To characterize a novel GRF, GRF2, identified in murine embryonic stem cells.
- To determine the expression pattern and structural relationship of GRF2 to known GRFs.
Main Methods:
- Partial cDNA encoding GRF2 was amplified from murine embryonic stem cells.
- Sequence analysis was performed to compare GRF2 with other known GRFs.
- GRF2 expression was analyzed at the mRNA and protein levels using Northern blotting and Western blotting with specific antibodies.
Main Results:
- A novel GRF, GRF2, was identified with high sequence similarity to yeast CDC25 and murine CDC25Mm/ras-GRF, particularly in the catalytic domain.
- GRF2 mRNA was highly expressed in the brain, and GRF2 protein was detected in various mouse tissues.
- Both GRF2 and CDC25Mm/ras-GRF were found to be expressed in murine embryonic stem cells.
Conclusions:
- GRF2 is a novel, widely expressed protein closely related to CDC25Mm/ras-GRF.
- The presence of different Ras activators like GRF2 and CDC25Mm/ras-GRF in embryonic stem cells suggests their potential roles in regulating ras-dependent proliferation and differentiation during early development.