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Related Concept Videos

DNA Replication02:40

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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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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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The DNA Replication Fork01:02

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

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An updated structural classification of replicative DNA polymerases.

Pierre Raia1,2, Marc Delarue1, Ludovic Sauguet3

  • 1Unit of Structural Dynamics of Macromolecules, CNRS UMR 3528, Pasteur Institute, 75015 Paris, France.

Biochemical Society Transactions
|January 17, 2019
PubMed
Summary
This summary is machine-generated.

Replicative DNA polymerases, essential for life, show diverse evolution across life’s domains. This review classifies these enzymes and explores their evolutionary links, highlighting the unique PolD family.

Keywords:
DNA polymerasesDNA replicationPolDclassificationevolutionproofreading

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Replicative DNA polymerases are vital molecular machines for genome duplication.
  • Unlike other cellular machinery, no single replicative DNA polymerase is conserved across all life.
  • Four distinct families (A, B, C, D) perform DNA replication in Bacteria, Eukarya, and Archaea.

Purpose of the Study:

  • To provide an updated structural classification of all replicative DNA polymerases (DNAPs).
  • To discuss the evolutionary relationships of replicative DNA polymerases.
  • To highlight the unique structural features of the archaeal D-family DNA polymerase (PolD).

Main Methods:

  • Literature review and analysis of structural studies.
  • Comparative structural classification of known replicative DNA polymerases.
  • Evolutionary relationship analysis based on structural and sequence data.

Main Results:

  • Identified four distinct families of replicative DNA polymerases (A, B, C, D) across life's domains.
  • Highlighted the unique structural characteristics of the PolD family, particularly its polymerase and proofreading active sites.
  • Demonstrated that PolD, essential in most Archaea, represents a distinct evolutionary path for DNA replication.

Conclusions:

  • Replicative DNA polymerases exhibit remarkable evolutionary diversity in structure and function.
  • The PolD family represents a significant, yet often overlooked, component of the replicative machinery in Archaea.
  • Understanding the structural diversity of replicative DNA polymerases deepens our knowledge of genome replication evolution.