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Mol. Cell. Biol., Sep 1996, 4961-4971, Vol 16, No. 9
P Friedlander, Y Haupt, C Prives and M Oren
Human wild-type (wt) p53 can induce apoptosis in transiently transfected
H1299 cells maintained at 37 degrees C, whereas tumor- derived mutant forms
of p53 (with the mutation Ala-143, His-175, or Trp- 248) fail to do so. At
37 degrees C, p53 with a mutation to Ala at amino acid 143 (p53Ala143) was
transcriptionally inactive. However, at 32 degrees C, p53Ala143 strongly
activated transcription from several physiologically relevant
p53-responsive promoters, to extents similar or greater than that of wt
p53. Unexpectedly, p53Ala143 was defective in inducing apoptosis in H1299
cells at 32 degrees C. Concomitantly with the loss of apoptotic activity,
p53Ala143 was found to be deficient in its ability to activate
transcription from the p53- responsive portions of the Bax and insulin-like
growth factor-binding protein 3 gene promoters. It is proposed that there
may exist distinct classes of p53-responsive promoters, whose ability to be
activated by p53 can be regulated differentially. Such differential
regulation may have functional consequences for the effects of p53 on cell
fate.
Copyright © 1996, American Society for Microbiology
A mutant p53 that discriminates between p53-responsive genes cannot induce apoptosis
Department of Biological Sciences, Columbia University, New York 10027, USA.
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