Role for KAP1 serine 824 phosphorylation and sumoylation/desumoylation switch in regulating KAP1-mediated transcriptional repression

Xu Li, Yung Kang Lee, Jen Chong Jeng, Yun Yen, David C. Schultz, Hsiu Ming Shih, David K. Ann

Research output: Contribution to journalArticle

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Abstract

As a multifunctional protein, KRAB domain-associated protein 1 (KAP1) is reportedly subjected to multiple protein posttranslational modifications, including phosphorylation and sumoylation. However, gaps exist in our knowledge of how KAP1 phosphorylation cross-talks with KAP1 sumoylation and what the biological consequence is. Here, we show that doxorubicin (Dox) treatment induces KAP1 phosphorylation at Ser-824 via an ataxia telangiectasia mutated (ATM)-dependent manner, correlating with the transcriptional de-repression of p21WAF1/CIP1 and Gadd45α. A S824A substitution of KAP1, which ablates the ATM-induced phosphorylation, results in an increase of KAP1 sumoylation and repression of p21 transcription in Dox-treated cells. By contrast, a S824D mutation of KAP1, which mimics constitutive phosphorylation of KAP1, leads to a decrease of KAP1 sumoylation and stimulation of p21 transcription before the exposure of Dox. We further provide evidence that SENP1 deSUMOylase is involved in activating basal, but not Dox-induced, KAP1 Ser-824 phosphorylation, rendering a stimulation of p21 and Gadd45α transcription. Moreover, KAP1 and differential sumoylation of KAP1 were also demonstrated to fine-tune the transcription of three additional KAP1-targeted genes, including Bax, Puma, and Noxa. Taken together, our results suggest a novel role for ATM that selectively stimulates KAP1 Ser-824 phosphorylation to repress its sumoylation, leading to the de-repression of expression of a subset of genes involved in promoting cell cycle control and apoptosis in response to genotoxic stresses.

Original languageEnglish (US)
Pages (from-to)36177-36189
Number of pages13
JournalJournal of Biological Chemistry
Volume282
Issue number50
DOIs
StatePublished - Dec 14 2007

Fingerprint

Sumoylation
Phosphorylation
Serine
Switches
Proteins
Ataxia Telangiectasia
Doxorubicin
Transcription
Protein Domains
Puma
Noxae
Genes
Cells
Post Translational Protein Processing
Cell Cycle Checkpoints

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Role for KAP1 serine 824 phosphorylation and sumoylation/desumoylation switch in regulating KAP1-mediated transcriptional repression. / Li, Xu; Lee, Yung Kang; Jeng, Jen Chong; Yen, Yun; Schultz, David C.; Shih, Hsiu Ming; Ann, David K.

In: Journal of Biological Chemistry, Vol. 282, No. 50, 14.12.2007, p. 36177-36189.

Research output: Contribution to journalArticle

Li, Xu ; Lee, Yung Kang ; Jeng, Jen Chong ; Yen, Yun ; Schultz, David C. ; Shih, Hsiu Ming ; Ann, David K. / Role for KAP1 serine 824 phosphorylation and sumoylation/desumoylation switch in regulating KAP1-mediated transcriptional repression. In: Journal of Biological Chemistry. 2007 ; Vol. 282, No. 50. pp. 36177-36189.
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AU - Shih, Hsiu Ming

AU - Ann, David K.

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