Involvement of DNA-dependent protein kinase in UV-induced replication arrest

Jang Su Park, Su Jung Park, Xiaodong Peng, Mu Wang, Myeong Ae Yu, Suk-Hee Lee

Research output: Contribution to journalArticle

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Abstract

Cells exposed to UV irradiation are predominantly arrested at S-phase as well as at the G1/S boundary while repair occurs. It is not known how UV irradiation induces S-phase arrest and yet permits DNA repair; however, UV- induced inhibition of replication is efficiently reversed by the addition of replication protein A (RPA), suggesting a role for RPA in this regulatory event. Here, we show evidence that DNA-dependent protein kinase (DNA-PK), plays a role in UV-induced replication arrest. DNA synthesis of M059K (DNA-PK catalytic subunit-positive (DNA-PKcs+)), as measured by [3H]thymidine incorporation, was significantly arrested by 4 h following UV irradiation, whereas M059J (DNA-PKcs-) cells were much less affected. Similar results were obtained with the in vitro replication reactions where immediate replication arrest occurred in DNA-PKcs+ cells following UV irradiation, and only a gradual decrease in replication activity was observed in DNA-PKcs- cells. Reversal of replication arrest was observed at 8 h following UV irradiation in DNA-PKcs+ cells but not in DNA-PKcs- cells. Reversal of UV- induced replication arrest was also observed in vitro by the addition of a DNA-PK inhibitor, wortmannin, or by immunodepletion of DNA-PKcs, supporting a positive role for DNA-PK in damage-induced replication arrest. The RPA- containing fraction from UV-irradiated DNA-PKcs+ cells poorly supported DNA replication, whereas the replication activity of the RPA-containing fraction from DNA-PKcs- cells was not affected by UV, suggesting that DNA-PKcs may be involved in UV-induced replication arrest through modulation of RPA activity. Together, our results strongly suggest a role for DNA-PK in S-phase (replication) arrest in response to UV irradiation.

Original languageEnglish
Pages (from-to)32520-32527
Number of pages8
JournalJournal of Biological Chemistry
Volume274
Issue number45
DOIs
StatePublished - Nov 5 1999

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DNA-Activated Protein Kinase
Replication Protein A
DNA
Irradiation
S Phase
Repair
Protein Kinase Inhibitors
DNA Replication
DNA Repair
Thymidine
Catalytic Domain

ASJC Scopus subject areas

  • Biochemistry

Cite this

Involvement of DNA-dependent protein kinase in UV-induced replication arrest. / Park, Jang Su; Park, Su Jung; Peng, Xiaodong; Wang, Mu; Yu, Myeong Ae; Lee, Suk-Hee.

In: Journal of Biological Chemistry, Vol. 274, No. 45, 05.11.1999, p. 32520-32527.

Research output: Contribution to journalArticle

Park, Jang Su ; Park, Su Jung ; Peng, Xiaodong ; Wang, Mu ; Yu, Myeong Ae ; Lee, Suk-Hee. / Involvement of DNA-dependent protein kinase in UV-induced replication arrest. In: Journal of Biological Chemistry. 1999 ; Vol. 274, No. 45. pp. 32520-32527.
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