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DciA, the Bacterial Replicative Helicase Loader, Promotes LLPS in the Presence of ssDNA

Authors: Stéphanie Marsin,Sylvain Jeannin,Sonia Baconnais,Hélène Walbott,Gérard Pehau-Arnaudet,Magali Noiray,Magali Aumont-Nicaise,Emil G.P. Stender,Claire Cargemel,Romain Le Bars,Eric Le Cam,Sophie Quevillon-Cheruel
Publisher: Elsevier BV
Publish date: 2025-1
ISSN: 0022-2836 DOI: 10.1016/j.jmb.2024.168873
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The study provides valuable insights into the role of DciA in bacterial replication through LLPS-mediated condensates. However, certain aspects would benefit from further clarification:

– Could the authors discuss how the ionic conditions used in the experiments (e.g., high NaCl concentrations) compare to the native bacterial intracellular environment? How might this influence DciA’s phase-separation behavior in vivo?
– The FRAP and FIDA analyses effectively characterize droplet dynamics, but could additional experiments, such as cross-linking or structural studies, help identify the specific residues or domains of DciA involved in driving LLPS?
– Given the observed differences between DciA- and DnaC-mediated LLPS, do the authors hypothesize that these mechanisms confer distinct functional advantages in replication initiation across bacterial species?

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