The tumor suppressor protein p53 stimulates the formation of the human topoisomerase I double cleavage complex in vitro

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Kent Søe - , Leibniz-Institut für Alternsforschung – Fritz-Lipmann-Institut (Autor:in)
  • Hella Hartmann - , Core Facility Lichtmikroskopie, Leibniz-Institut für Alternsforschung – Fritz-Lipmann-Institut (Autor:in)
  • Bernhard Schlott - , Leibniz-Institut für Alternsforschung – Fritz-Lipmann-Institut (Autor:in)
  • Tinna Stevnsner - , Universität Aarhus (Autor:in)
  • Frank Grosse - , Leibniz-Institut für Alternsforschung – Fritz-Lipmann-Institut (Autor:in)

Abstract

Previous studies have shown that human topoisomerase I interacts directly with the tumor-suppressor protein p53. In the past few years it has repeatedly been suggested that topoisomerase I and p53 may play a joint role in the response to genotoxic stress. This led to the suggestion that p53 and human topoisomerase I may cooperate in the process of DNA repair and/or apoptosis. Recently we have demonstrated that a human topoisomerase I cleavage complex can be recognized by an additional topoisomerase I molecule and thereby forma so-called double cleavage complex. The double cleavage complex creates an about 13 nucleotides long single-stranded gap that may provide an entry site for recombinational repair events. Here we demonstrate that p53 stimulates both the DNA relaxation activity as well as the formation of the human topoisomerase I double cleavage complex by at least a factor of six. Stimulation of topoisomerase I activity by p53 is mediated via the central part of topoisomerase I. We also show that human, bovine, and murine p53 stimulate human topoisomerase I relaxation activity equally well. From these results it is conceivable that p53's stimulatory activity on topoisomerase I may play a role in DNA recombination and repair as well as in apoptosis.

Details

OriginalspracheEnglisch
Seiten (von - bis)6614-6623
Seitenumfang10
FachzeitschriftOncogene
Jahrgang21
Ausgabenummer43
PublikationsstatusVeröffentlicht - 2002
Peer-Review-StatusJa

Externe IDs

PubMed 12242659
ORCID /0000-0002-7133-7474/work/142251281

Schlagworte

Ziele für nachhaltige Entwicklung

Schlagwörter

  • DNA damage, Genomic instability, p53, Recombination, Repair, Topoisomerase I