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. 1985 Aug;5(8):1887–1893. doi: 10.1128/mcb.5.8.1887

In vitro expression of human p53 cDNA clones and characterization of the cloned human p53 gene.

D Wolf, Z Laver-Rudich, V Rotter
PMCID: PMC366904  PMID: 3018534

Abstract

The human p53 gene was cloned and characterized by using a battery of p53 DNA clones. A series of human cDNA clones of various sizes and relative localizations to the mRNA molecule were isolated by using the human p53-H14 (2.35-kilobase) cDNA probe which we previously cloned. One such isolate, clone p53-H7 (2.65 kilobases), spans the entire human mature p53 mRNA molecule. Construction of the human cDNA clones in the pSP65 RNA transcription vector facilitated the generation of p53 transcripts by the SP6 bacteriophage RNA polymerase. The p53-specific RNA transcripts obtained without further processing were translated into p53 proteins in a cell-free system. By using this rapid in vitro transcription-translation assay, we found that whereas clone p53-H7 (2.65 kilobases) coded for a mature-sized p53 protein, a shorter cDNA clone, p53-H13 (1.8 kilobases), dictated the synthesis of a smaller-sized p53 protein (45 kilodaltons). The p53 proteins synthesized in vitro immunoprecipitated efficiently with human-specific anti-p53 antibodies. Genomic analysis of human DNA revealed the presence of a single p53 gene residing within two EcoRI fragments. Heteroduplex analysis between the full-length cDNA clone p53-H7 and the cloned p53 gene indicated the presence of seven major exons.

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Selected References

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