Abstract
Using a new competition assay, we investigated the effect of DNA negative supercoiling on the DNA sequence-specific binding (SSDB) of human wild-type (wt) p53 protein. We found that supercoiled (sc) pBluescript DNAs with different inserted p53 target sequences were stronger competitors than a mixture of scDNA pBluescript with the given 20-mer target oligodeoxynucleotide. ScDNAs were always better competitors than their linearized or relaxed forms. Two DNAs with extruded cruciforms within the target sequence were the best competitors; removal of the cruciforms resulted in a decrease of competitor strength. In contrast to the full-length wt p53, the deletion mutant p53CΔ30 and the p53 core domain (93–312 aa) showed no enhancement of p53 SSDB to scDNA, suggesting that, in addition to the p53 core domain, the C-terminal was involved in this binding. We conclude that cruciforms and DNA bends contribute to the enhancement of p53 SSDB to scDNA and that the DNA supercoiling is an important determinant in the p53 sequence-specific binding. Supercoiling may thus play a significant role in the complex p53-regulatory network.
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Abbreviations
- scDNA:
-
supercoiled DNA
- lin:
-
linear DNA
- oligo:
-
oligodeoxynucleotide
- oligo-t:
-
oligodeoxynucleotide with p53 target sequence
- SK-:
-
plasmid pBluescript SK-
- SCS:
-
supercoil-selective
- SSDB:
-
sequence-specific DNA binding
- fl:
-
full length
- wt:
-
wild type
- CON:
-
consensus sequence
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Acknowledgements
This work was supported by grants of the Grant Agency of the Czech Republic 301/00/D001 to VB, and of the GAASCR Nos. B5004203 to VB, and Z5004920, A4004110 and COST OC D21.002 to EP.
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Paleček, E., Brázda, V., Jagelská, E. et al. Enhancement of p53 sequence-specific binding by DNA supercoiling. Oncogene 23, 2119–2127 (2004). https://doi.org/10.1038/sj.onc.1207324
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DOI: https://doi.org/10.1038/sj.onc.1207324
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