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Replication in Eukaryotes02:31

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DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
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Related Experiment Video

Updated: Apr 24, 2026

Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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Structural insights into eukaryotic DNA replication.

Sylvie Doublié1, Karl E Zahn1

  • 1Department of Microbiology and Molecular Genetics, University of Vermont Burlington, VT, USA.

Frontiers in Microbiology
|September 10, 2014
PubMed
Summary

Eukaryotic DNA polymerases α, δ, and ε initiate and elongate DNA replication. Structural analysis reveals shared elements and unique features among these essential replication fork enzymes.

Keywords:
B familyDNA polymeraseeukaryotic replicationfidelityproofreading

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • DNA polymerases α, δ, and ε are crucial B family enzymes functioning at the eukaryotic replication fork.
  • DNA polymerase α initiates replication, while polymerases δ and ε elongate DNA strands.
  • The bacteriophage RB69 DNA polymerase has historically served as a model for eukaryotic B family polymerases.

Purpose of the Study:

  • To review the structural similarities and differences among eukaryotic DNA polymerases α, δ, and ε.
  • To compare the structures of eukaryotic DNA polymerases with their bacteriophage counterpart.
  • To highlight unique structural features of each yeast DNA polymerase.

Main Methods:

  • Analysis of recent crystal structures of yeast DNA polymerases α, δ, and ε.
  • Comparative structural analysis of eukaryotic B family polymerases.
  • Review of existing literature on DNA polymerase structure and function.

Main Results:

  • Recent crystal structures reveal both conserved and divergent structural elements among eukaryotic DNA polymerases α, δ, and ε.
  • Unexpected structural differences were identified between eukaryotic polymerases and the bacteriophage RB69 DNA polymerase.
  • Significant structural variations exist even among the three yeast B family DNA polymerases.

Conclusions:

  • Structural insights into DNA polymerases α, δ, and ε provide a deeper understanding of eukaryotic DNA replication.
  • The structural data challenges the direct applicability of bacteriophage models to all aspects of eukaryotic DNA polymerases.
  • Further investigation into the unique structural features of each polymerase may elucidate their specific roles in replication.