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Pre-replication assembly of E. coli replisome components.

Tanneke den Blaauwen1, Mirjam E G Aarsman, Linda J Wheeler

  • 1Molecular Cytology, Swammerdam Institute for Life Sciences, University of Amsterdam, Kruislaan 316, 1098 SM Amsterdam, the Netherlands.

Molecular Microbiology
|September 27, 2006
PubMed
Summary
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This study visualizes bacterial DNA replication proteins, revealing SeqA protein

Area of Science:

  • Microbiology and Molecular Biology
  • Cellular and Developmental Biology

Background:

  • Understanding the spatial organization of DNA replication machinery is crucial for bacterial cell division and genome stability.
  • Previous models suggested a tightly localized dNTP synthesis complex near replication factories (RFs), but experimental evidence was limited.

Purpose of the Study:

  • To investigate the subcellular localization of key proteins involved in bacterial DNA replication, including SeqA, thymidylate synthase, DnaB helicase, and DNA polymerase subunits (alpha and tau).
  • To determine the spatial relationship between these proteins, the origin of replication (oriC), and replication factories (RFs) during different stages of the cell cycle.

Main Methods:

  • Immunofluorescence microscopy was employed to visualize the localization of SeqA, thymidylate synthase, DnaB, and DNA polymerase subunits.

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  • The origin of replication (oriC) was labeled using GFP-LacI.
  • Co-localization studies were performed to assess the spatial proximity of different protein complexes.

    • Main Results:

    • SeqA protein exhibited dynamic localization, found centrally in cells with one RF and at quarter/three-quarter positions in cells with two RFs.
    • Thymidylate synthase was diffusely distributed throughout the cell, not exclusively localized near RFs.
    • An excess of DnaB, alpha, and tau foci suggested their presence at pre-replication assembly sites, with numbers correlating with future RFs and origins.
    • SeqA foci did not significantly overlap with DnaB, indicating RFs are distinct from SeqA binding sites.
    • DnaB showed limited co-localization with oriC, suggesting it's not yet associated at pre-replication sites.
    • Alpha and tau subunits consistently co-localized, indicating pre-replication complex formation.

    Conclusions:

    • Bacterial DNA replication involves distinct protein localization patterns, with SeqA dynamics and diffuse thymidylate synthase distribution challenging previous models.
    • Pre-replication assembly sites likely exist for DnaB, alpha, and tau, with alpha and tau forming an early complex.
    • Replication factories appear to be organized into higher-order structures during multifork replication, spatially separated from SeqA-bound hemimethylated sites.