Dna Glycosylase Activity
Dna Glycosylase Activity - Related Videos
14:27
Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
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Cited by 26 •
2013
Time courses for the glycosylase activity of 8-oxoguanine DNA glycosylase are biphasic exhibiting a burst of product formation and a linear steady-state phase. Utilizing quench-flow techniques, the burst and the steady-state rates can be measured, which correspond to excision of 8-oxoguanine and release of the glycosylase from the product DNA, respectively.
07:38
DNA Polymerase Activity Assay Using Near-infrared Fluorescent Labeled DNA Visualized by Acrylamide Gel Electrophoresis
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Cited by 2 •
2017
This protocol describes the characterization of DNA polymerase synthesis of modified DNA through observation of changes to near-infrared fluorescently labeled DNA using gel electrophoresis and gel imaging. Acrylamide gels are used for high resolution imaging of the separation of short nucleic acids, which migrate at different rates depending on size.
12:19
Uracil-DNA Glycosylase Assay by Matrix-assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry Analysis
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2022
A non-labeled, non-radio-isotopic method to assay uracil-DNA glycosylase activity was developed using MALDI-TOF mass spectrometry for direct apurinic/apyrimidinic site-containing product analysis. The assay proved to be quite simple, specific, rapid, and easy to use for DNA glycosylase measurement.
11:25
A G-quadruplex DNA-affinity Approach for Purification of Enzymatically Active G4 Resolvase1
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Cited by 6 •
2017
G4 Resolvase1 binds to G-quadruplex (G4) structures with the tightest reported affinity for a G4-binding protein and represents the majority of the G4-DNA unwinding activity in HeLa cells. We describe a novel protocol that harnesses the affinity and ATP-dependent unwinding activity of G4-Resolvase1 to specifically purify catalytically active recombinant G4R1.
11:19
Correlating Gene-specific DNA Methylation Changes with Expression and Transcriptional Activity of Astrocytic KCNJ10 (Kir4.1)
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Cited by 9 •
2015
DNA methylation is capable of maintaining stable levels of gene expression as well as allowing for dynamic changes in gene expression in response to a variety of stimuli. We detail techniques that allow the study of gene-specific changes in DNA methylation and the effect of these changes on gene expression.
FAQs
The activity profile shows which damaged or inappropriate bases an enzyme can recognize and remove, indicating substrate specificity. Measuring how efficiently that removal occurs provides information about catalytic efficiency. These properties distinguish repair enzymes by the lesions they target and by how effectively they initiate repair, helping researchers relate enzyme behavior to particular forms of DNA damage.
Base removal does not complete repair; it creates an abasic, or AP, site that must be processed by the base excision repair pathway. This intermediate connects the enzyme’s recognition step with subsequent repair events. Therefore, detecting glycosylase activity identifies the initiation of repair while also highlighting the need to evaluate how the resulting AP site is handled.
Different glycosylase activities can be examined against damage associated with oxidation, alkylation, or deamination, as well as inappropriate bases. The resulting activity patterns indicate which lesion classes an enzyme responds to. This comparison helps clarify how cells address chemically distinct threats to DNA and how selective recognition contributes to genome stability.
An assay can characterize which DNA substrates support base removal and how efficiently the reaction proceeds. It can also be used to examine cellular responses associated with DNA damage. Together, these measurements provide a functional view of repair capacity rather than only indicating that a repair enzyme is present.
Researchers examine this activity when they want to understand how defects in DNA repair contribute to mutation and disease. Reduced or altered lesion processing can indicate that damaged or inappropriate bases are not being addressed normally. Connecting enzyme activity with repair defects helps explain how impaired genome maintenance may influence biological and biomedical outcomes.
Activity measurements provide a way to assess repair function in studies focused on therapies that target DNA repair. By tracking substrate specificity, catalytic efficiency, or cellular responses to damage, researchers can determine how repair capacity changes in the experimental context. This information supports interpretation of whether a treatment affects the intended repair-related process.