Wrn Exonuclease Activity
Wrn Exonuclease Activity - Related Videos
06:10
A Fluorescence-based Exonuclease Assay to Characterize DmWRNexo, Orthologue of Human Progeroid WRN Exonuclease, and Its Application to Other Nucleases
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Cited by 4 •
2013
Exonucleases play critical roles in ensuring genome stability. Loss of WRN exonuclease function results in premature aging. Studying substrates and other requirements of the nuclease in vitro can help elucidate its role in vivo. Here we demonstrate a rapid and reproducible fluorescence-based assay to measure its nuclease activity.
08:11
Cell-Free Protein Synthesis from Exonuclease-Deficient Cellular Extracts Utilizing Linear DNA Templates
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Cited by 2 •
2022
Presented here is a protocol for the preparation and buffer calibration of cell extracts from exonuclease V knockout strains of Escherichia coli BL21 Rosetta2 (ΔrecBCD and ΔrecB). This is a fast, easy, and direct approach for expression in cell-free protein synthesis systems using linear DNA templates.
14:09
Genetic Studies of Human DNA Repair Proteins Using Yeast as a Model System
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Cited by 2 •
2010
Genetic studies in yeast can be employed to investigate the molecular and cellular functions of human genes in cellular DNA metabolism. Methods are described for the genetic characterization of the human WRN gene product defective in the premature aging disorder Werner syndrome in functionally conserved pathways using yeast as a tractable model system.
09:13
Chromatographic Purification of Highly Active Yeast Ribosomes
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Cited by 7 •
2011
Contamination of preparations of eukaryotic ribosomes purified by traditional methods by co-purifying nucleases and proteases negatively impacts on downstream biochemical and structural analyses. A rapid and simple chromatographic purification method is used to solve this problem using yeast ribosomes as a model system.
08:40
High-Resolution Mapping of Protein-DNA Interactions in Mouse Stem Cell-Derived Neurons using Chromatin Immunoprecipitation-Exonuclease (ChIP-Exo)
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Cited by 2 •
2020
Precise determination of protein-binding locations across the genome is important for understanding gene regulation. Here we describe a genomic mapping method that treats chromatin-immunoprecipitated DNA with exonuclease digestion (ChIP-exo) followed by high-throughput sequencing. This method detects protein-DNA interactions with near base-pair mapping resolution and high signal-to-noise ratio in mammalian neurons.
FAQs
The activity can remove nucleotides from 3′ ends of several DNA configurations, including recessed ends, mismatched ends, and structured ends. These substrates represent different DNA-processing challenges rather than a single uniform end. By acting on them, the WRN protein can prepare abnormal or damaged DNA intermediates for subsequent remodeling during genome-maintenance processes.
The N-terminal exonuclease domain and WRN helicase activity can operate together on DNA intermediates. Exonucleolytic removal changes the structure of a DNA end, while helicase activity can remodel DNA structures. Their coordination provides a mechanism for processing substrates that require both nucleotide removal and structural rearrangement during repair, replication, or recombination.
Processing a 3′ DNA end can help convert a recessed, mismatched, or structured terminus into an intermediate that is more suitable for DNA repair or other genome-maintenance reactions. This matters because unresolved DNA structures can interfere with replication and recombination. WRN exonuclease activity therefore contributes to the controlled handling of potentially destabilizing DNA intermediates.
WRN exonuclease activity is relevant to DNA replication, repair, recombination, and telomere maintenance. In these settings, its role centers on preparing or resolving DNA structures that arise during genome maintenance. Considering all four contexts helps explain why the activity has broad biological significance rather than functioning only in one specialized repair event.
A focused investigation can compare how WRN processes DNA with recessed, mismatched, or structured 3′ ends. The resulting nucleotide removal can then be considered in relation to the presence of WRN helicase activity and the type of DNA intermediate. Such comparisons help define substrate handling and clarify how WRN processing supports genome-maintenance mechanisms.
Defects in the WRN gene provide a context for studying impaired genome stability, premature-aging features, and cancer susceptibility. Examining exonuclease activity helps connect altered DNA-end processing with failures in replication, repair, recombination, or telomere maintenance. This work also supports research on DNA-repair mechanisms and on therapeutic vulnerabilities associated with WRN-related defects.