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Related Concept Videos

Mismatch Repair01:36

Mismatch Repair

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Overview
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Mismatch Repair01:20

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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
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Fixing Double-strand Breaks02:04

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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Spontaneous and Induced Mutations01:30

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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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Homologous Recombination02:31

Homologous Recombination

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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...
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Related Experiment Video

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Tools to Study the Role of Architectural Protein HMGB1 in the Processing of Helix Distorting, Site-specific DNA Interstrand Crosslinks
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Dynamic human MutSα-MutLα complexes compact mismatched DNA.

Kira C Bradford1,2, Hunter Wilkins1, Pengyu Hao3

  • 1Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599.

Proceedings of the National Academy of Sciences of the United States of America
|June 27, 2020
PubMed
Summary
This summary is machine-generated.

Human DNA mismatch repair (MMR) proteins MutSα and MutLα form large, dynamic complexes on DNA to correct replication errors. These structures compact DNA, potentially enhancing repair efficiency and preventing interference.

Keywords:
AFMDNA repairDREEMMutLMutS

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA mismatch repair (MMR) is crucial for genomic stability, correcting replication errors.
  • Mutations in MMR proteins cause Lynch syndrome, a common hereditary cancer.
  • Existing MMR models are largely based on prokaryotic systems and lack detail on human complex structures.

Purpose of the Study:

  • To investigate the structure-function properties of human MutSα-MutLα complexes during DNA mismatch repair.
  • To explore the time- and concentration-dependent assembly and conformations of these complexes on DNA.

Main Methods:

  • Atomic force microscopy (AFM) was used to visualize DNA-protein complexes.
  • Combined with other methods to analyze complex formation and dynamics.

Main Results:

  • Human MutSα-MutLα complexes assemble into large, multimeric structures (3-8 proteins) around DNA mismatches.
  • These complexes undergo conformational changes, folding and compacting the DNA within minutes.
  • Observed assembly contrasts with models of diffusive MMR complexes.

Conclusions:

  • MutSα actively localizes MutLα near mismatches, promoting DNA configurations for efficient repair.
  • These complexes may protect the repair site from nucleosome interference and remodel nucleosomes.