The Effect of Phosphorylation on the Antigenic Reactivity of p53 in Cultured Human Keratinocytes

M. Kumar, Dan Spandau

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The detection of p53 in human keratinocytes is dependent on the specific anti-p53 monoclonal antibody that is used. Differences in antibody recognition are postulated to be due to the masking or exposure of particular epitopes in different conformations of p53. This study addresses the role of phosphorylation on p53-epitope accessibility in human keratinocytes. Keratinocytes were treated with the phosphatase inhibitor, okadaic acid, to determine the effect of inhibiting cellular phosphatases on p53 phosphorylation and epitope recognition. These studies suggest there is a correlation between the level of p53 phosphorylation and the antigenic reactivity of certain p53 epitopes in human keratinocytes. We also examined the ability of the catalytic subunits of protein phosphatase 1 and 2A to dephosphorylate p53 derived from human keratinocytes in vitro. These data suggest that PP2A may be the phosphatase that acts on p53 in cultured human keratinocytes.

Original languageEnglish
Pages (from-to)744-753
Number of pages10
JournalBiochemical and Biophysical Research Communications
Volume214
Issue number2
DOIs
StatePublished - Sep 14 1995

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Phosphorylation
Keratinocytes
Epitopes
Phosphoric Monoester Hydrolases
Protein Phosphatase 1
Protein Phosphatase 2
Okadaic Acid
Conformations
Monoclonal Antibodies
Antibodies

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology
  • Biophysics
  • Biochemistry

Cite this

The Effect of Phosphorylation on the Antigenic Reactivity of p53 in Cultured Human Keratinocytes. / Kumar, M.; Spandau, Dan.

In: Biochemical and Biophysical Research Communications, Vol. 214, No. 2, 14.09.1995, p. 744-753.

Research output: Contribution to journalArticle

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