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Communication between DNA polymerases and Replication Protein A within the archaeal replisome
Markel Martínez-Carranza1, Léa Vialle2, Clément Madru1
1Architecture and Dynamics of Biological Macromolecules, Institut Pasteur, Université Paris Cité, CNRS UMR 3528, Paris, France.
Nature Communications
|December 31, 2024
Summary
Archaeal Replication Protein A (RPA) has a winged-helix domain that binds DNA primase and DNA polymerase, stimulating primase activity. This reveals RPA
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.
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