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Research Papers
Department of Microbiology, State University of New York, Stony Brook 11794.
Abstract
We have investigated the DNA-binding, oligomerization, and trans-activation functions of isolated segments of murine p53. We find that p53 has two autonomous DNA-binding regions. One domain, from amino acid 280 to 390, forms stable tetramers and binds DNA nonspecifically. The biological significance, if any, of this DNA-binding activity is not known. A second domain, from amino acid 80 to 290, does not form stable tetramers under stringent conditions but binds DNA both specifically and nonspecifically. The specific DNA-binding function of p53, therefore, resides in the highly conserved central region of the protein and does not require stable tetramerization. Amino acids 1-290, which include both the specific DNA-binding domain and the amino-terminal acidic region, activate a p53-specific promoter in vivo. This finding strongly argues that the DNA-binding activity of p53 segment 80-290 is physiologically significant. The role of tetramerization in p53 function remains to be determined.
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