한빛사논문, 상위피인용논문
Abstract
Won Ho Yang1, 2, Ji Eun Kim1, 2, Hyung Wook Nam2, 3, Jung Won Ju1, 2, Hoe Suk Kim1, 2, Yu Sam Kim2, 3, 4 & Jin Won Cho1, 2, 4
1 Department of Biology, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea.
2 Protein Network Research Center, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea.
3 Department of Biochemistry, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea.
4 ProteomeTech, Yonsei Dairy Building, Seodaemun-gu, Seoul 120-749, Korea.
Correspondence should be addressed to Jin Won Cho
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.
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