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Modification of p53 with O-linked N-acetylglucosamine regulates p53 activity and stability

Modification of p53 with O-linked N-acetylglucosamine regulates p53 activity and stability Post-translational addition of O-linked N-acetylglucosamine (O-GlcNAc) to p53 is known to occur, but the site of O-GlcNAcylation and its effects on p53 are not understood. Here, we show that Ser 149 of p53 is O-GlcNAcylated and that this modification is associated with decreased phosphorylation of p53 at Thr 155, which is a site that is targeted by the COP9 signalosome, resulting in decreased p53 ubiquitination. Accordingly, O-GlcNAcylation at Ser 149 stabilizes p53 by blocking ubiquitin-dependent proteolysis. Our results indicate that the dynamic interplay between O-GlcNAc and O-phosphate modifications coordinately regulate p53 stability and activity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Cell Biology Springer Journals

Modification of p53 with O-linked N-acetylglucosamine regulates p53 activity and stability

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References (52)

Publisher
Springer Journals
Copyright
Copyright © 2006 by Nature Publishing Group
Subject
Life Sciences; Life Sciences, general; Cell Biology; Cancer Research; Developmental Biology; Stem Cells
ISSN
1465-7392
eISSN
1476-4679
DOI
10.1038/ncb1470
Publisher site
See Article on Publisher Site

Abstract

Post-translational addition of O-linked N-acetylglucosamine (O-GlcNAc) to p53 is known to occur, but the site of O-GlcNAcylation and its effects on p53 are not understood. Here, we show that Ser 149 of p53 is O-GlcNAcylated and that this modification is associated with decreased phosphorylation of p53 at Thr 155, which is a site that is targeted by the COP9 signalosome, resulting in decreased p53 ubiquitination. Accordingly, O-GlcNAcylation at Ser 149 stabilizes p53 by blocking ubiquitin-dependent proteolysis. Our results indicate that the dynamic interplay between O-GlcNAc and O-phosphate modifications coordinately regulate p53 stability and activity.

Journal

Nature Cell BiologySpringer Journals

Published: Sep 10, 2006

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