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Analysis of trk A and p53 association
1Cancer Research Unit, Medical School, Framlington Place, University of Newcastle, Newcastle upon Tyne NE2 4HH, UK.
Abstract:
trk A tyrosine kinase (the high affinity receptor for nerve growth factor) binds to the p53 tumour suppressor protein in vitro and in vivo. Our aim was to determine which regions of p53 are involved in trk A association. In vitro binding experiments using baculovirus expressed trk A and in vitro transcribed and translated C-terminus p53 deletion mutants show amino acids 327-338 critical for association. Also, analysis with mutants at the N-terminus, conserved regions II, III, IV and V or amino acid positions 173, 175, 181, 248 and 249 (which are amino acids frequently mutated in a variety of neoplasms and transformed cell lines), show that these sites are not involved in trk A binding. Importantly, similar results are obtained after immunoprecipitation of lysates from p53 negative fibroblasts expressing trk A and the above p53 mutant proteins. These data suggest that the amino-terminus of the oligomerisation domain of p53 is involved in p53/trk A association.
Insights
The high-affinity receptor for nerve growth factor, trk A tyrosine kinase, binds to the p53 tumor suppressor protein. The amino-terminus of p53
Area of Science:
- Molecular Biology
- Cellular Signaling
- Cancer Research
Background:
- trk A tyrosine kinase is the high-affinity receptor for nerve growth factor.
- The p53 tumor suppressor protein plays a critical role in cellular responses to stress and DNA damage.
- trk A has been shown to bind to p53 both in vitro and in vivo.
Purpose of the Study:
- To identify the specific regions of the p53 protein that are involved in its association with trk A.
- To elucidate the molecular mechanisms underlying the interaction between p53 and trk A.
Main Methods:
- In vitro binding experiments utilizing baculovirus-expressed trk A.
- Analysis of C-terminus p53 deletion mutants generated through in vitro transcription and translation.
- Immunoprecipitation assays using lysates from p53-negative fibroblasts expressing trk A and various p53 mutants.
Main Results:
- Amino acids 327-338 of p53 were identified as critical for trk A association.
- Mutations in the N-terminus, conserved regions II-V, and specific amino acid positions (173, 175, 181, 248, 249) did not affect trk A binding.
- Consistent results were observed in both in vitro binding assays and immunoprecipitation experiments.
Conclusions:
- The amino-terminus of the oligomerization domain of p53 is implicated in the association with trk A.
- This finding provides insights into the structural basis of p53/trk A interaction.
- Understanding this interaction may have implications for cancer therapy targeting the p53 pathway.
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