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Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis

Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis

Published on: June 19, 2018

Substrate-induced DNA strand misalignment during catalytic cycling by DNA polymerase lambda.

Katarzyna Bebenek¹, Miguel Garcia-Diaz, Meredith C Foley

¹Laboratory of Structural Biology and Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina 27709, USA.

|March 29, 2008

Summary

Simple nucleotide deletions, common in organisms, can be beneficial or harmful. DNA polymerase lambda structures reveal how dNTPs control strand slippage, a key mechanism in deletion mutagenesis.

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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method

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Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

Simple nucleotide deletions are prevalent in organisms, impacting gene function.
These deletions can be advantageous for microbial survival or deleterious, causing diseases like cancer.
Strand slippage during DNA synthesis is the classical mechanism proposed for deletion formation.

Purpose of the Study:

To elucidate the molecular mechanisms controlling strand slippage during DNA synthesis.
To understand how DNA polymerase activity influences deletion mutagenesis.
To investigate the role of dNTPs in regulating strand slippage.

Main Methods:

X-ray crystallography of mutant DNA polymerase lambda.
Molecular dynamics simulations of polymerase-template interactions.
Biochemical assays to measure deletion mutagenesis rates.

Main Results:

Crystal structures revealed multiple conformations of the template strand during slippage.
Mutant polymerases exhibited high rates of single-base deletions.
dNTP-induced repositioning of the template strand was identified as a critical event.

Conclusions:

Strand slippage is controlled by conformational rearrangements within the DNA polymerase catalytic cycle.
Template strand repositioning, driven by dNTP binding, is crucial for regulating deletion mutagenesis rates.
This provides a mechanistic understanding of how simple deletions are generated at the molecular level.