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Papers In Press, published online ahead of print January 22, 2002
Microbiology and Infectious Diseases, University of Calgary, Calgary, Alberta T2N 4N1
Corresponding Author: plee{at}ucalgary.ca
Precisely how mutant p53 exerts a dominant negative effect over wild type p53 has been an enigma. To understand how wild type and mutant p53 form hetero-oligomers, we studied p53 biogenesis in vitro. We show here that p53 dimers are formed cotranslationally (on the polysome), whereas tetramers are formed posttranslationally (by the dimerization of dimers in solution). Co-expression of wild type and mutant p53 therefore results in 50% of the p53 generated being heterotetramers, and they comprise a single species: wild type dimer/mutant dimer. Using hot spot mutants of p53 and a variety of natural target sites, we show that all wild type/mutant heterotetramers manifest impaired DNA binding activity. This impairment is not due to the mutant dimeric subunit inhibiting association of the complex with DNA, but rather due to the lack of significant contribution (positive cooperativity) from the mutant partner. For all heterotetramers, bias in binding is particularly pronounced against those sequences in genes responsible for apoptosis rather than cell growth arrest. These results explain the molecular basis of p53 dominant negative effect and suggest a functional role in the regulation of p53 tetramerization.
J. Biol. Chem, 10.1074/jbc.M108815200
Submitted on September 12, 2001
Revised on January 22, 2002
Accepted on January 21, 2002
Biogenesis of p53 involves cotranslational dimerization of monomers and posttranslational dimerization of dimers: implications on the dominant negative effect
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