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In Vitro Assays of TWINKLE Function.

Jay P Uhler1, Ulrika Alexandersson1, Maria Falkenberg2

  • 1Department of Medical Biochemistry and Cell Biology, University of Gothenburg, Gothenburg, Sweden.

Methods in Molecular Biology (Clifton, N.J.)
|February 22, 2023
PubMed
Summary
This summary is machine-generated.

This study details methods to analyze TWINKLE helicase and ATPase activities. These assays use purified TWINKLE protein to understand its role in mitochondrial DNA replication.

Keywords:
DNA helicaseIn vitroMitochondriaReplicationmtDNA

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • TWINKLE is a crucial helicase for mitochondrial DNA replication.
  • Understanding TWINKLE's function requires studying its enzymatic activities.

Purpose of the Study:

  • To present reliable methods for assessing TWINKLE's helicase and ATPase activities.
  • To provide tools for mechanistic studies of TWINKLE at the replication fork.

Main Methods:

  • Helicase activity assay: Incubating TWINKLE with a radiolabeled oligonucleotide and M13mp18 DNA, followed by gel electrophoresis and autoradiography.
  • ATPase activity assay: Employing a colorimetric method to quantify phosphate release from ATP hydrolysis by TWINKLE.

Main Results:

  • Established protocols for measuring TWINKLE's DNA unwinding and ATP hydrolysis capabilities.
  • Demonstrated the utility of these in vitro assays for mechanistic investigations.

Conclusions:

  • The presented methods enable detailed characterization of TWINKLE's enzymatic functions.
  • These assays are vital for advancing our understanding of mitochondrial DNA replication and repair mechanisms.