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Neutralizing monoclonal antibody against ras oncogene product p21 which impairs guanine nucleotide exchange
Molecular and Cellular Biology
|May 1, 1987
Abstract:
The neutralizing monoclonal antibody Y13-259 severely hampers the nucleotide exchange reaction between p21-bound and exogenous guanine nucleotides but does not interfere with the association of GDP to p21. These results suggest that the nucleotide exchange reaction is critical for p21 function. Interestingly, the v-ras p21 has a much faster dissociation rate than the p21 of the c-ras proto-oncogene.
Insights
Monoclonal antibody Y13-259 inhibits nucleotide exchange for p21 Ras proteins, highlighting its importance in function. Viral Ras p21 shows faster guanine nucleotide dissociation than cellular Ras p21.
Area of Science:
- Molecular Biology
- Oncogenesis
- Protein Biochemistry
Background:
- Ras proteins (p21) are key regulators of cellular signaling pathways.
- Guanine nucleotide binding and exchange are critical for Ras protein activity.
- Proto-oncogenes like c-ras and viral oncogenes like v-ras encode Ras proteins with distinct properties.
Purpose of the Study:
- To investigate the role of the nucleotide exchange reaction in p21 Ras function.
- To characterize the interaction of monoclonal antibody Y13-259 with p21 Ras.
- To compare the guanine nucleotide dissociation rates between viral and cellular Ras p21.
Main Methods:
- Utilized a neutralizing monoclonal antibody (Y13-259) targeting p21 Ras.
- Assessed the impact of the antibody on guanine nucleotide exchange reactions.
- Measured the association of GDP to p21.
- Compared dissociation rates of guanine nucleotides from v-ras p21 and c-ras p21.
Main Results:
- Monoclonal antibody Y13-259 significantly inhibits the nucleotide exchange reaction for p21 Ras.
- The antibody does not affect the binding of GDP to p21.
- v-ras p21 exhibits a considerably faster rate of guanine nucleotide dissociation compared to c-ras p21.
Conclusions:
- The nucleotide exchange reaction is essential for the biological function of p21 Ras.
- Differences in nucleotide dissociation rates may contribute to the distinct activities of viral and cellular Ras proteins.
- Antibody Y13-259 serves as a valuable tool for studying Ras protein function and nucleotide dynamics.