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Molecular and Cellular Biology, April 1999, p. 2828-2834, Vol. 19, No. 4
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Requirement of ATM in Phosphorylation of the Human
p53 Protein at Serine 15 following DNA Double-Strand Breaks
Kazumi
Nakagawa,1
Yoichi
Taya,2
Katsuyuki
Tamai,3 and
Masaru
Yamaizumi1,*
Institute of Molecular Embryology and
Genetics, Kumamoto University School of Medicine, Kumamoto
862-0976,1 National Cancer Center
Research Institute, Chuo-ku, Tokyo
104-0045,2 and Ina Laboratory, MBL Co.
Ltd., Ina, Nagano 396,3 Japan
Received 17 September 1998/Returned for modification 3 November
1998/Accepted 7 January 1999
Microinjection of the restriction endonuclease HaeIII, which causes
DNA double-strand breaks with blunt ends, induces nuclear accumulation
of p53 protein in normal and xeroderma pigmentosum (XP) primary
fibroblasts. In contrast, this induction of p53 accumulation is not
observed in ataxia telangiectasia (AT) fibroblasts. HaeIII-induced p53
protein in normal fibroblasts is phosphorylated at serine 15, as
determined by immunostaining with an antibody specific for
phosphorylated serine 15 of p53. This phosphorylation correlates well
with p53 accumulation. Treatment with lactacystin (an inhibitor of the
proteasome) or heat shock leads to similar levels of p53 accumulation
in normal and AT fibroblasts, but the p53 protein lacks a
phosphorylated serine 15. Following microinjection of HaeIII into
lactacystin-treated normal fibroblasts, lactacystin-induced p53 protein
is phosphorylated at serine 15 and stabilized even in the presence of
cycloheximide. However, neither stabilization nor phosphorylation at
serine 15 is observed in AT fibroblasts under the same conditions.
These results indicate the significance of serine 15 phosphorylation
for p53 stabilization after DNA double-strand breaks and an absolute
requirement for ATM in this phosphorylation process.
*
Corresponding author. Mailing address: Institute of
Molecular Embryology and Genetics, Kumamoto University School of
Medicine, Kuhonji 4-24-1, Kumamoto 862-0976, Japan. Phone:
81(96)373-5340. Fax: 81(96)364-3554. E-mail:
yamaizm{at}gpo.kumamoto-u.ac.jp.
Molecular and Cellular Biology, April 1999, p. 2828-2834, Vol. 19, No. 4
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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