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Related Concept Videos

Replication in Prokaryotes01:32

Replication in Prokaryotes

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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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Coordination of Gene Expression Processes in Bacteria01:29

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The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
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Restarting Stalled Replication Forks02:37

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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The Replisome03:01

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
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Bacterial RNA Polymerase00:43

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
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Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
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Replication initiation in bacteria: precision control based on protein counting.

Haochen Fu1, Fangzhou Xiao1, Suckjoon Jun2

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

Biorxiv : the Preprint Server for Biology
|June 9, 2023
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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 high initiator protein levels and active/inactive forms, ensuring robust cell-cycle control.

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Area of Science:

  • Microbiology and Molecular Biology
  • Cell Biology
  • Systems Biology

Background:

  • Bacterial cell physiology maintains steady protein concentrations, posing challenges for cell-cycle and cell-size control models.
  • Existing eukaryote models based on concentration sensing are not directly applicable to bacteria.
  • Understanding bacterial replication initiation is crucial for cell division and growth.

Approach:

  • Extended the 30-year-old initiator-titration model using a mean-field approach.
  • Derived analytical expressions for cell size at initiation based on mechanistic control parameters.
  • Analyzed model stability and utilized simulations to investigate initiator protein dynamics.

Key Points:

  • The extended initiator-titration model explains precise replication initiation via protein copy-number sensing.
  • Model stability is enhanced by the conversion between active (DnaA-ATP) and inactive (DnaA-ADP) initiator forms.
  • The two-step Poisson process improves initiation synchrony, achieving CV scaling of ~1/N.

Conclusions:

  • Provides a general solution for precise bacterial cell-cycle control without direct protein concentration sensing.
  • Answers why bacteria produce excess initiator proteins (DnaA) and utilize active/inactive forms.
  • Has broad implications for understanding bacterial evolution and synthetic cell design.