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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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Structure and function relationships in mammalian DNA polymerases.

Nicole M Hoitsma1, Amy M Whitaker1, Matthew A Schaich1

  • 1Department of Biochemistry and Molecular Biology, University of Kansas Medical Center, Kansas City, KS, 66160, USA.

Cellular and Molecular Life Sciences : CMLS
|November 14, 2019
PubMed
Summary

Mammalian DNA polymerases are crucial for DNA synthesis, repair, and signaling. This review details the structure and function of all 15 types, highlighting insights from atomic resolution structures.

Keywords:
DNA polymeraseDNA repairDNA synthesisReplicationStructural biology

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • DNA polymerases are essential enzymes for DNA replication and repair.
  • Mammalian cells possess a diverse set of DNA polymerases with specialized functions.
  • Understanding these enzymes is critical for comprehending DNA metabolism and cellular processes.

Purpose of the Study:

  • To review the structure and function of all 15 mammalian DNA polymerases.
  • To emphasize insights gained from atomic resolution structures of DNA polymerases.
  • To discuss the mechanistic subtleties contributing to polymerase specialization.

Main Methods:

  • Literature review of existing research on mammalian DNA polymerases.
  • Analysis of atomic resolution structures of DNA polymerases bound to DNA substrates.
  • Discussion of structure-function relationships and accessory factor involvement.

Main Results:

  • Detailed review of DNA polymerases from families B, Y, X, and A.
  • Elucidation of mechanistic details through structural analysis.
  • Correlation of structural features with specialized functions in replication, repair, and signaling.

Conclusions:

  • Mammalian DNA polymerases exhibit diverse structures and functions crucial for genome integrity.
  • Atomic resolution structures provide key mechanistic insights into polymerase specialization.
  • Further structural studies will continue to advance our understanding of DNA metabolism.