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Common conformational effects of p53 mutations
Abstract:
The tumor suppressor gene p53 has been identified as the most frequent target of genetic alterations in human cancers. Most of these mutations occur in highly conserved regions in the DNA-binding core domain of the p53 protein, suggesting that the amino acid residues in these regions are critical for maintaining normal p53 structure and function. We previously used molecular dynamics calculations to demonstrate that several amino acid substitutions in these regions that are induced by environmental carcinogens and found in human tumors produce certain common conformational changes in the mutant proteins that differ substantially from the wild-type structure. In order to determine whether these conformational changes are consistent for other p53 mutants, we have now used molecular dynamics to determine the structure of the DNA-binding core domain of seven other environmentally induced, cancer-related p53 mutants, namely His 175, Asp 245, Asn 245, Trp 248, Met 249, Ser 278, and Lys 286. The results indicate that all of these mutants differ substantially from the wild-type structure in certain discrete regions and that some of these conformational changes are similar for these mutants as well as those determined previously. The changes are also consistent with experimental evidence for alterations in structure in p53 mutants determined by epitope detectability using monoclonal antibodies directed against these regions of predicted conformational change.
Insights
Mutations in the tumor suppressor gene p53, common in cancers, alter its structure. Molecular dynamics simulations reveal consistent conformational changes in cancer-related p53 mutants, impacting protein function.
Area of Science:
- Oncology
- Molecular Biology
- Biophysics
Background:
- The p53 gene is frequently altered in human cancers, with mutations often located in its DNA-binding core domain.
- These mutations are critical for p53 protein structure and function, influencing cancer development.
Purpose of the Study:
- To investigate conformational changes in seven environmentally induced, cancer-related p53 mutants using molecular dynamics.
- To determine if observed structural differences are consistent across various p53 mutants.
Main Methods:
- Utilized molecular dynamics calculations to simulate and analyze the DNA-binding core domain of seven specific p53 mutants (His175, Asp245, Asn245, Trp248, Met249, Ser278, Lys286).
- Compared the resulting structures with the wild-type p53 structure.
Main Results:
- All seven p53 mutants exhibited substantial conformational differences in discrete regions compared to the wild-type structure.
- Some induced conformational changes were consistent across different mutants and with previously studied p53 mutants.
- Findings align with experimental data on p53 mutant structure alterations, such as epitope detectability.
Conclusions:
- Environmentally induced, cancer-related p53 mutations lead to common, significant structural changes in the p53 DNA-binding core domain.
- These structural alterations are consistent across various mutants and correlate with experimental observations.
- Understanding these conformational changes is crucial for comprehending p53's role in cancer and developing targeted therapies.
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