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Changes in protein phosphorylation in Rous sarcoma virus-transformed chicken embryo cells
1Salk Institute, San Diego, California 92138.
Molecular and Cellular Biology
|February 1, 1981
Summary
Researchers identified seven key phosphoproteins in Rous sarcoma virus-transformed cells. These proteins, containing phosphotyrosine, are likely substrates of the tyrosine-specific protein kinase p60src, crucial for cell transformation.
Area of Science:
- Molecular Biology
- Virology
- Biochemistry
Background:
- Rous sarcoma virus (RSV) encodes p60src, a tyrosine-specific protein kinase essential for cell transformation.
- Identifying substrates of p60src is crucial for understanding viral oncogenesis and cell signaling pathways.
Purpose of the Study:
- To identify novel phosphotyrosine-containing proteins in RSV-transformed chicken embryo cells.
- To determine which proteins are direct or indirect substrates of the p60src kinase.
Main Methods:
- Utilized the alkali stability of phosphotyrosine for detection.
- Separated 32P-labeled phosphoproteins using isoelectric focusing and SDS-PAGE.
- Analyzed phosphoprotein profiles in normal versus RSV-transformed cells.
Main Results:
- Detected approximately 190 alkali-resistant phosphoproteins in normal cells.
- Identified five novel phosphoproteins in RSV-transformed cells.
- Found that three transformation-dependent and four elevated phosphoproteins contained phosphotyrosine, suggesting they are p60src substrates.
Conclusions:
- Seven specific phosphoproteins are likely substrates of p60src kinase.
- These findings advance the understanding of tyrosine kinase signaling in viral transformation.
- Further investigation may reveal roles in other tyrosine kinase-mediated cellular processes.