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Bacterial Replication Initiation as Precision Control by Protein Counting.

Haochen Fu1, Fangzhou Xiao1, Suckjoon Jun2

  • 1Department of Physics, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA.

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Summary
This summary is machine-generated.

Bacteria precisely control DNA replication initiation using protein copy-number sensing, extending the initiator-titration model. This mechanism explains excess initiator protein production and active/inactive forms, ensuring robust cell-cycle control.

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Area of Science:

  • Bacterial Physiology
  • Molecular Biology
  • Cell Cycle Regulation

Background:

  • Bacterial cell physiology maintains steady protein concentrations, posing challenges for cell-cycle and cell-size control models.
  • Existing eukaryote-based models are not directly applicable to bacterial replication initiation.

Purpose of the Study:

  • To extend the initiator-titration model for bacterial replication initiation.
  • To explain precise and robust control of replication initiation via protein copy-number sensing.
  • To address long-standing questions regarding initiator protein (DnaA) production and its active/inactive forms.

Main Methods:

  • Analytical derivation of cell size at initiation using a mean-field approach.
  • Stability analysis of the extended initiator-titration model.
  • Simulations to investigate the role of active/inactive initiator protein conversion.

Main Results:

  • Derived an analytical expression for cell size at initiation based on three control parameters.
  • Identified conditions for initiation instability in multifork replication.
  • Demonstrated that active/inactive initiator conversion represses instability and improves initiation synchrony ( scaling).

Conclusions:

  • The extended initiator-titration model provides a general solution for precise bacterial replication control without direct protein concentration sensing.
  • Explains the high production of DnaA and the necessity of its active/inactive forms.
  • Offers broad implications for understanding bacterial evolution and synthetic cell design.