Augmented DNA-binding activity of p53 protein encoded by a carboxyl-terminal alternatively spliced mRNA is blocked by p53 protein encoded by the regularly spliced form

Roland Wolkowicz, Amnon Peled, N. Barry Elkind, Varda Rotter

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

DNA-binding activity of the wild-type p53 is central to its function in vivo. However, recombinant or in vitro translated wild-type p53 proteins, unless modified, are poor DNA binders. The fact that the in vitro produced protein gains DNA-binding activity upon modification at the C terminus raises the possibility that similar mechanisms may exist in the cell. Data presented here show that a C-terminal alternatively spliced wild-type p53 (ASp53) mRNA expressed by bacteria or transcribed in vitro codes for a p53 protein that efficiently binds DNA. Our results support the conclusion that the augmented DNA binding activity of an ASp53 protein is probably due to attenuation of the negative effect residing at the C terminus of the wild-type p53 protein encoded by the regularly spliced mRNA (RSp53) rather than acquisition of additional functionality by the alternatively spliced C′ terminus. In addition, we found that ASp53 forms a complex with the non-DNA-binding RSp53, which in turn blocks the DNA-binding activity of ASp53. Interaction between these two wild-type p53 proteins may underline a mechanism that controls the activity of the wild-type p53 protein in the cell.

Original languageEnglish
Pages (from-to)6842-6846
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume92
Issue number15
DOIs
Publication statusPublished - Jul 18 1995

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