26 S Proteasome-mediated Degradation of Topoisomerase II Cleavable Complexes

Yong Mao, Shyamal D. Desai, Chun Yuan Ting, Jaulang Hwang, Leroy-Fong Liu

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

DNA topoisomerase II (TOP2) cleavable complexes represent an unusual type of DNA damage characterized by reversible TOP2-DNA cross-links and DNA double strand breaks. Many antitumor drugs and physiological stresses are known to induce TOP2 cleavable complexes leading to apoptotic cell death and genomic instability. However, the molecular mechanism(s) for repair of TOP2 cleavable complexes remains unclear. In the current studies, we show that TOP2 cleavable complexes induced by the prototypic TOP2 poison VM-26 are proteolytically degraded by the ubiquitin/26 S proteasome pathway. Surprisingly the TOP2β TOP20 isozyme is preferentially degraded over TOP2α isozyme. In addition, transcription inhibitors such as 5,6-dichlorobenzimidazole riboside and camptothecin can substantially block VM-26-induced TOP2β degradation. These results are consistent with a model in which the repair of TOP2β cleavable complexes may involve transcription-dependent proteolysis of TOP2β to reveal the protein-concealed double strand breaks.

Original languageEnglish
Pages (from-to)40652-40658
Number of pages7
JournalJournal of Biological Chemistry
Volume276
Issue number44
DOIs
Publication statusPublished - Nov 2 2001
Externally publishedYes

Fingerprint

Teniposide
Type II DNA Topoisomerase
Proteasome Endopeptidase Complex
Isoenzymes
Dichlororibofuranosylbenzimidazole
Transcription
Degradation
Camptothecin
Physiological Stress
Double-Stranded DNA Breaks
Genomic Instability
Poisons
DNA
Repair
Ubiquitin
Antineoplastic Agents
Proteolysis
DNA Damage
Cell Death
Cell death

ASJC Scopus subject areas

  • Biochemistry

Cite this

26 S Proteasome-mediated Degradation of Topoisomerase II Cleavable Complexes. / Mao, Yong; Desai, Shyamal D.; Ting, Chun Yuan; Hwang, Jaulang; Liu, Leroy-Fong.

In: Journal of Biological Chemistry, Vol. 276, No. 44, 02.11.2001, p. 40652-40658.

Research output: Contribution to journalArticle

Mao, Yong ; Desai, Shyamal D. ; Ting, Chun Yuan ; Hwang, Jaulang ; Liu, Leroy-Fong. / 26 S Proteasome-mediated Degradation of Topoisomerase II Cleavable Complexes. In: Journal of Biological Chemistry. 2001 ; Vol. 276, No. 44. pp. 40652-40658.
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