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DNA Sequence Recognition by DNA Primase Using High-Throughput Primase Profiling
08:04

DNA Sequence Recognition by DNA Primase Using High-Throughput Primase Profiling

Published on: October 8, 2019

Class-specific restrictions define primase interactions with DNA template and replicative helicase

Marilynn A Larson1, Mark A Griep, Rafael Bressani

  • 1Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE 68198-5900, USA. malarson@unmc.edu

Nucleic Acids Research
|July 2, 2010
PubMed

Insights

Bacterial primase and helicase interactions are crucial for DNA replication. This study reveals how primase template specificity is conserved within bacterial classes, while primase-helicase interactions co-evolve within species.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Bacterial DNA replication relies on primase to synthesize RNA primers, a process stimulated by replicative helicase.
  • Understanding primase regulation is key to deciphering DNA replication mechanisms.

Purpose of the Study:

  • To investigate the mechanisms regulating bacterial primase activity and its interaction with replicative helicase.
  • To determine the roles of different primase domains in de novo primer synthesis and template recognition.

Main Methods:

  • Characterization of primase initiation specificity and helicase interactions in Firmicutes and Proteobacteria.
  • Utilized mutated, truncated, chimeric, and wild-type primases to assess domain contributions.
  • Analyzed key residues in the zinc-binding domain for template recognition and specificity transfer.

Main Results:

  • Identified key residues in the primase zinc-binding domain responsible for class-specific trinucleotide recognition, with substitutions transferring specificity.
  • Provided evidence for in trans interaction between primase domains, influencing template recognition.
  • Demonstrated species-specific modulation of RNA primer length by helicase binding, correlating with genetic relatedness.

Conclusions:

  • Bacterial primase template specificity is conserved within bacterial classes.
  • Primase-helicase interactions have co-evolved within individual bacterial species, highlighting functional adaptation.

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