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Methylation-sensitive DNA binding by v-myb and c-myb proteins
1Hans-Spemann-Laboratory, Max-Planck-Institute for Immunobiology, Freiburg, Germany.
Oncogene
|January 1, 1993
Summary
The viral (v-MYB) and cellular (c-MYB) proteins regulate gene transcription. This study shows that their DNA binding is affected by CpG methylation, suggesting a new regulatory mechanism for MYB function.
Area of Science:
- Molecular Biology
- Epigenetics
- Oncogene Research
Background:
- The retroviral oncogene v-myb and its cellular homolog c-myb encode nuclear DNA-binding phosphoproteins (v-MYB and c-MYB).
- These MYB proteins function as transcriptional regulators, binding to a specific nucleotide sequence motif (PyAACG/TG).
- This motif is crucial for regulating the expression of the myb-inducible mim-1 gene.
Purpose of the Study:
- To investigate whether the DNA binding of v-MYB and c-MYB proteins is sensitive to CpG methylation.
- To explore the potential role of CpG methylation within the myb-binding motif in regulating MYB protein function.
Main Methods:
- Utilized bacterially expressed v-MYB and authentic v-MYB and c-MYB proteins.
- Assessed the binding of these MYB proteins to the myb binding site motif.
- Investigated the effect of CpG methylation within the binding motif on protein-DNA interaction.
Main Results:
- Demonstrated that both bacterially expressed v-MYB and authentic v-MYB and c-MYB proteins bind to the myb binding site in a methylation-sensitive manner.
- Confirmed that CpG methylation of the binding motif influences the recognition by MYB proteins.
Conclusions:
- MYB protein binding to its DNA recognition site is sensitive to CpG methylation.
- These findings suggest that DNA methylation of myb binding sites may represent a novel mechanism for regulating MYB protein function.
- This methylation-dependent regulation could have implications for gene expression control in various cellular processes.