Regulation of DNA binding and transactivation in p53 by nuclear localization and phosphorylation

Jesse D Martinez, M. T. Craven, E. Joseloff, G. Milczarek, G. T. Bowden

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Compelling evidence indicates that p53 acts as a transcription factor and that this activity is regulated by several factors including subcellular localization and phosphorylation status of the protein. To learn more about how these two processes determine whether p53 becomes activated, we studied the temperature sensitive murine p53, p53(val135). At nonpermissive temperatures, p53(val135) remains sequestered in the cytoplasm of cells which express it. Electrophoretic mobility shift assays demonstrated that, under these conditions, the protein lacked DNA binding activity. However, by shifting to the permissive temperature, p53(val135) became concentrated in the nucleus, hyperphosphorylated, and had acquired the ability to bind DNA in a sequence specific manner. This was accompanied by the induction of two p53 regulated genes, mdm2 and p21(waf1), which indicated that p53(val135) had become an active transcription factor. Two dimensional gel electrophoresis and tryptic peptide mapping showed that entry into the nucleus resulted in the appearance of new phosphorylated isoforms and that the protein had become extensively phosphorylation at the N-terminus. Notably, phosphorylation at the N-terminus occurred only in the nucleus, whereas phosphorylation at the C-terminus could occur in both the cytoplasm and the nucleus. Based on these observations, we suggest that phosphorylation of p53's N-terminus is compartmentally restricted.

Original languageEnglish (US)
Pages (from-to)2511-2520
Number of pages10
JournalOncogene
Volume14
Issue number21
DOIs
StatePublished - 1997

Fingerprint

Transcriptional Activation
Phosphorylation
DNA
Temperature
Cytoplasm
Transcription Factors
Peptide Mapping
p53 Genes
Electrophoresis, Gel, Two-Dimensional
DNA-Binding Proteins
Electrophoretic Mobility Shift Assay
Protein Isoforms
Proteins

Keywords

  • DNA binding
  • Nuclear localization
  • P53
  • Phosphorylation
  • Transactivation

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Genetics

Cite this

Regulation of DNA binding and transactivation in p53 by nuclear localization and phosphorylation. / Martinez, Jesse D; Craven, M. T.; Joseloff, E.; Milczarek, G.; Bowden, G. T.

In: Oncogene, Vol. 14, No. 21, 1997, p. 2511-2520.

Research output: Contribution to journalArticle

Martinez, Jesse D ; Craven, M. T. ; Joseloff, E. ; Milczarek, G. ; Bowden, G. T. / Regulation of DNA binding and transactivation in p53 by nuclear localization and phosphorylation. In: Oncogene. 1997 ; Vol. 14, No. 21. pp. 2511-2520.
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