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Deciphering the human TopIIIα activity modulated by Rmi1 using magnetic tweezers.

Long Yun1, Florence Garnier1,2,3, Terence R Strick1,3

  • 1Institut de Biologie de l'Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, PSL University, INSERM, CNRS, Paris 75005, France.

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Summary
This summary is machine-generated.

Topoisomerase IIIα (TopoIIIα) enzymes are vital for genome stability. The partner protein Rmi1 significantly enhances TopoIIIα

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Topoisomerases IA (TopoIAs) are essential enzymes found across all domains of life.
  • Metazoa typically possess two TopoIAs: TopIIIα and TopIIIβ, which perform distinct cellular functions.
  • TopIIIα plays a critical role in maintaining genome stability by resolving DNA topological issues during replication and recombination.

Purpose of the Study:

  • To elucidate the detailed enzymatic cycle of Topoisomerase IIIα (TopoIIIα).
  • To investigate the precise role of the partner protein Rmi1 in TopoIIIα function.
  • To differentiate between intrinsic TopoIIIα catalytic properties and those modulated by Rmi1 using single-molecule approaches.

Main Methods:

  • Utilized a single-molecule approach to analyze the Topoisomerase IIIα (TopoIIIα) enzymatic cycle.
  • Investigated the interaction between TopoIIIα and its partner protein Rmi1.
  • Characterized DNA binding kinetics and complex stabilization.

Main Results:

  • The rate-limiting step for Topoisomerase IIIα (TopoIIIα) is DNA binding, which necessitates a single-stranded DNA region.
  • TopoIIIα exhibits extended pauses during its catalytic cycle to stabilize the open cleaved complex.
  • Rmi1 enhances TopoIIIα's efficiency by facilitating single-stranded DNA trapping and stabilizing the cleaved complex, promoting substrate discrimination.

Conclusions:

  • Rmi1 is a critical partner protein that significantly boosts Topoisomerase IIIα (TopoIIIα) efficiency and substrate specificity.
  • Rmi1's modulation of DNA binding and complex stabilization is essential for smooth in vivo DNA transaction processes.
  • Understanding the TopoIIIα-Rmi1 interaction provides insights into genome stability mechanisms.