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Engineering human PrimPol into an efficient RNA-dependent-DNA primase/polymerase.

Rubén Agudo1, Patricia A Calvo1, María I Martínez-Jiménez1

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Summary

Researchers discovered a novel RNA-dependent DNA priming-polymerization activity in human PrimPol (HsPrimPol). A Y89R mutant showed 10-fold higher activity, enhancing DNA synthesis for biotechnological applications.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Human PrimPol (HsPrimPol) is a key enzyme involved in DNA repair and replication.
  • Understanding its primase-polymerase activity is crucial for various cellular processes.

Purpose of the Study:

  • To develop a sensitive assay for measuring HsPrimPol activity.
  • To discover and enhance novel RNA-dependent DNA priming-polymerization (RdDP) activity.
  • To explore the biotechnological potential of HsPrimPol for DNA synthesis.

Main Methods:

  • Development of a straightforward fluorometric assay for primase-polymerase activity.
  • Construction and screening of a HsPrimPol mutant library.
  • Biochemical characterization of wild-type and mutant HsPrimPol.
  • Assessment of DNA synthesis using random hexamer primers.

Main Results:

  • A novel RNA-dependent DNA priming-polymerization (RdDP) activity of HsPrimPol was uncovered.
  • A specific mutant, Y89R HsPrimPol, exhibited a 10-fold increase in RdDP activity compared to wild-type.
  • The enhanced activity of Y89R mutant is attributed to improved preternary complex stabilization.
  • Mutant Y89R HsPrimPol produced up to 17-fold more DNA compared to random hexamer primers.

Conclusions:

  • HsPrimPol possesses a previously unrecognized RdDP activity.
  • The Y89R mutant significantly enhances this RdDP activity, offering biotechnological potential.
  • This engineered enzyme could serve as an efficient DNA primer generator for applications like reverse transcription.