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Related Concept Videos

Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Mismatch Repair01:36

Mismatch Repair

Overview
Mismatch Repair01:36

Mismatch Repair

Overview
Homologous Recombination02:31

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
Homologous Recombination02:31

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
DNA Helicases00:55

DNA Helicases

DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...

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Related Experiment Video

Updated: Jun 12, 2026

Visualization of DNA Repair Proteins Interaction by Immunofluorescence
07:55

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

Does a helicase activity help mismatch repair in eukaryotes?

Limin Song1, Fenghua Yuan, Yanbin Zhang

  • 1Department of Biochemistry and Molecular Biology, Miller School of Medicine, University of Miami, Miami, FL 33136, USA.

IUBMB Life
|June 17, 2010
PubMed
Summary

DNA mismatch repair (MMR) corrects replication errors. This review explores how DNA helicases may function in eukaryotic MMR, addressing a key question in DNA repair mechanisms.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Mismatch repair (MMR) is crucial for correcting DNA replication errors.
  • The molecular mechanisms and components of eukaryotic MMR are largely understood.
  • In vitro reconstitution of nick-directed MMR with human proteins has been achieved.

Purpose of the Study:

  • To review the interactions between eukaryotic DNA helicases and MMR factors.
  • To explore the potential role of DNA helicase activity in eukaryotic MMR.
  • To propose a mechanism for DNA helicase involvement in DNA mismatch repair.

Main Methods:

  • Literature review of eukaryotic DNA helicases and MMR factors.
  • Analysis of existing data on MMR pathways.
  • Hypothetical mechanism proposal based on protein interactions.

Main Results:

  • Identified interactions between DNA helicases and known MMR proteins.
  • Highlighted the unresolved question of helicase requirement in eukaryotic MMR.
  • Suggested a potential model for helicase-mediated DNA unwinding during MMR.

Conclusions:

  • DNA helicases may play a significant role in eukaryotic MMR.
  • Further research is needed to elucidate the precise function of helicases in this pathway.
  • Understanding helicase involvement could refine models of DNA repair fidelity.