An engineered four-stranded coiled coil substitutes for the tetramerization domain of wild-type p53 and alleviates transdominant inhibition by tumor-derived p53 mutants.
The tetramerization domain of p53 is required for efficient tumor suppressor activity. This domain, however, also allows wild-type p53 to heterooligomerize with dominant negative tumor-derived p53 mutants. We explored the feasibility of substituting the native tetramerization domain of wild-type p53 with an engineered leucine zipper that assembles as a four-stranded coiled coil. The engineered zipper drove p53 tetramerization in vitro and p53 function in vivo. Furthermore, it alleviated transdominant inhibition by tumor-derived p53 mutants, implying that dominant negative mutants act by hetero-oligomerizing with wild-type p53. The ability of the engineered zipper to drive tetramerization was critical for p53 function, since p53 dimers, formed by substituting the p53 tetramerization domain with a native leucine zipper, were weak tumor suppressors.
Waterman
M J
MJ
Department of Molecular Oncology, Wistar Institute, Philadelphia, PA 19104-4268, USA.
Waterman
J L
JL
Halazonetis
T D
TD
D001483:Base Sequence; D004274:DNA, Recombinant / Q000235:genetics; D006801:Humans; D008969:Molecular Sequence Data; D009154:Mutation; D011487:Protein Conformation; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000235:genetics* / Q000378:metabolism
D004274:DNA, Recombinant; D011993:Recombinant Fusion Proteins; D016159:Tumor Suppressor Protein p53