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Archaeal Replication Protein A (RPA) has a winged-helix domain that binds DNA primase and DNA polymerase, stimulating primase activity. This reveals RPA

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genomics

Background:

  • Replication Protein A (RPA) is crucial for DNA replication, protecting single-stranded DNA and recruiting replication factors.
  • Archaeal RPA contains a winged-helix (WH) domain, a key component in its function.

Purpose of the Study:

  • To elucidate the molecular mechanisms of archaeal RPA interactions with other replication factors.
  • To understand the role of the WH domain in RPA's regulatory activity.

Main Methods:

  • Integrative structural biology approach.
  • Nuclear magnetic resonance (NMR) spectroscopy.
  • X-ray crystallography.
  • Cryo-electron microscopy (cryo-EM).

Main Results:

  • Archaeal RPA's WH domain interacts with DNA primase (PriSL) and replicative DNA polymerase (PolD).
  • Two distinct binding surfaces on the WH domain mediate these interactions.
  • RPA binding stimulates PriSL activity in a WH-dependent manner.

Conclusions:

  • RPA's WH domain is a regulatory hub for key replication factors in Archaea.
  • This interaction mechanism is conserved and relevant for genome maintenance in both Archaea and Eukaryotes.