Uracil Dna Glycosylase
Uracil Dna Glycosylase - Related Videos
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.
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.
04:36
Bisulfite Conversion of Genomic DNA: A Method to Study DNA Methylation in Genomic DNA Samples from Gastrointestinal Cancer Tissue
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2023
This video demonstrates the procedure of bisulfite modification of genomic DNA from gastrointestinal cancer samples. The technique is beneficial for investigating the relationship between genes’ methylation patterns and establishing their contribution to carcinogenesis.
08:47
DNA Methylation Analysis
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2023
Methylation at CpG dinucleotides is a chemical modification of DNA hypothesized to play important roles in regulating gene expression. In particular, the methylation of clusters of methylation sites, called “CpG islands”, near promoters and other gene regulatory elements may contribute to the stable silencing of genes, for example, during epigenetic processes such as genomic imprinting and X-chromosome inactivation. At the same time, aberrant CpG methylation has been shown to be associated with...
02:25
Overview of DNA Repair
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2020
In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage. Chemically...
FAQs
The enzyme addresses uracil produced by two different routes: cytosine deamination and incorrect uracil incorporation during DNA replication. Although these events arise differently, both place uracil in DNA where it can contribute to inaccurate genetic information. Recognizing either source allows the repair process to remove the abnormal base and reduce the likelihood that the change becomes a mutation.
Uracil DNA glycosylase cleaves the bond connecting the uracil base to its sugar in the DNA backbone. This reaction does not complete repair by itself; instead, it creates an abasic site, meaning a position lacking its normal base. Downstream base excision repair enzymes then process that site, allowing the damaged position to be resolved.
Removing uracil protects the correspondence between DNA sequence and inherited genetic information. Uracil can arise from chemical alteration of cytosine or from replication errors, so leaving it in place could increase the chance of inaccurate sequence transmission. By initiating repair at the affected base, the enzyme contributes to genome integrity and helps limit mutation formation.
In PCR workflows that use uracil-containing DNA, uracil DNA glycosylase provides a way to target DNA carrying that base. This supports contamination-control strategies by addressing uracil-containing material associated with the workflow. Its value comes from linking a defined DNA feature, uracil, to an enzymatic cleanup step rather than treating all DNA as an indistinguishable source of contamination.
The relevant substrate is DNA containing uracil, whether the base resulted from cytosine deamination or incorrect incorporation during replication. The enzyme recognizes that altered base within the DNA molecule and removes it from its sugar. This requirement makes uracil status an important variable when studying the activity or applying the enzyme in molecular biology workflows.
Genetic studies of uracil DNA glycosylase connect a specific DNA repair reaction with broader questions about mutation prevention and genome maintenance. Researchers can examine how abnormal bases are recognized, how an abasic site initiates downstream processing, and how repair supports accurate genetic information. The enzyme therefore provides a focused system for investigating base excision repair and replication-associated errors.