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Related Concept Videos

Replication in Eukaryotes01:29

Replication in Eukaryotes

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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Replication in Eukaryotes02:31

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Replication in Eukaryotes01:29

Replication in Eukaryotes

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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Eukaryotic replication follows many of the same...
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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Replication in Prokaryotes02:35

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A conserved mechanism for replication origin recognition and binding in archaea.

Alan I Majerník1, James P J Chong

  • 1Institute of Animal Biochemistry and Genetics, Slovak Academy of Sciences, 900 28 Ivanka pri Dunaji, Slovak Republic.

The Biochemical Journal
|October 25, 2007
PubMed
Summary

DNA replication origins were identified in methanogens, the only archaea lacking this demonstration. The study found Methanothermobacter thermautotrophicus origin recognition box (ORB) sequences function in vivo, with specific protein binding mechanisms conserved across archaea.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Methanogens, a group of archaea, were previously uncharacterized regarding in vivo DNA replication origins.
  • Origin Recognition Box (ORB) sequences are crucial for initiating DNA replication in archaea.

Purpose of the Study:

  • To demonstrate the in vivo function of ORB sequences as replication origins in the archaeon Methanothermobacter thermautotrophicus.
  • To investigate the sequence specificity and conservation of the DNA replication origin recognition mechanism in archaea.

Main Methods:

  • In vivo replication assays using Methanothermobacter thermautotrophicus.
  • In vitro DNA binding studies with MthCdc6-1 protein and MthORB sequences.
  • Site-directed mutagenesis of ORB sequences and Cdc6-1 protein.

Main Results:

  • Identified functional in vivo DNA replication origins in Methanothermobacter thermautotrophicus using ORB sequences.
  • MthCdc6-1 protein exhibits sequence-specific binding to MthORB, with conserved recognition mechanisms involving an invariant guanine and an arginine residue.
  • Despite sequence variations, the fundamental mechanism of origin recognition and binding is conserved across archaea.

Conclusions:

  • The study establishes the in vivo function of DNA replication origins in methanogens.
  • The conserved interaction between Cdc6/ORB and specific DNA sequences highlights a fundamental mechanism in archaeal DNA replication.
  • This work deepens the understanding of DNA replication initiation across the archaeal domain.