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Related Concept Videos

Replication in Prokaryotes01:32

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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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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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Stoichiometry of DnaA and DnaB protein in initiation at the Escherichia coli chromosomal origin.

The Journal of biological chemistry·2001
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Essential amino acids of Escherichia coli DnaC protein in an N-terminal domain interact with DnaB helicase.

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Escherichia coli DnaA protein. The N-terminal domain and loading of DnaB helicase at the E. coli chromosomal origin.

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The FIS protein fails to block the binding of DnaA protein to oriC, the Escherichia coli chromosomal origin.

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Role of adenine nucleotides, molecular chaperones and chaperonins in stabilization of DnaA initiator protein of Escherichia coli.

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The Escherichia coli dnaA gene: four functional domains.

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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.

S Chodavarapu1, J M Kaguni1

  • 1Michigan State University, East Lansing, MI, United States.

The Enzymes
|June 1, 2016
PubMed
Summary

Bacterial DNA replication initiation involves the initiator protein DnaA assembling replication machinery at the origin. DnaA facilitates DNA unwinding and loads the DnaB helicase, enabling DNA synthesis.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Bacterial DNA replication initiates at a specific origin locus.
  • DnaA protein, conserved across bacteria, acts as the initiator.
  • DnaA binds ATP to form an active oligomer, initiating replication fork assembly.

Purpose of the Study:

  • To elucidate the mechanism of bacterial DNA replication initiation.
  • To describe the roles of DnaA, DnaB, and DnaC proteins in replication.
  • To detail the assembly of the prepriming complex and helicase loading.

Main Methods:

  • The abstract describes a mechanistic pathway rather than specific experimental methods.
  • Focuses on protein-protein interactions and DNA binding events.
  • Involves biochemical and genetic analyses of replication initiation factors.
Keywords:
DNA replicationDnaADnaBDnaCHelicase loadingInitiationReplication origin

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Main Results:

  • DnaA-ATP facilitates unwinding of AT-rich origin regions.
  • DnaA mediates the binding of DnaB helicase (complexed with DnaC) to form the prepriming complex.
  • DnaC dissociation activates DnaB helicase, allowing its translocation to the replication fork.

Conclusions:

  • The coordinated action of DnaA, DnaB, and DnaC is crucial for initiating bacterial DNA replication.
  • Helicase loading and activation are key steps regulated by protein interactions.
  • This process ensures the efficient synthesis of DNA by DNA polymerase III holoenzyme.