Dna Cleavage Assay
Dna Cleavage Assay - Related Videos
02:42
A Fluorogenic Peptide Cleavage Assay to Screen the Proteolytic Activity of Proteases
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2025
This video demonstrates an assay to screen for the proteolytic activity of proteases using fluorogenic peptides. The protease recognizes its cleavage site on the peptide, cleaving it and separating the quencher from the fluorophore, enabling its fluorescence emission. The fluorescence signal is detected and analyzed to check for the cleavage efficiency of different peptide variants.
06:51
Parallel High Throughput Single Molecule Kinetic Assay for Site-Specific DNA Cleavage
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Cited by 2 •
2020
A highly parallel method for measuring the site-specific cleavage of DNA at the single molecule level is described. This protocol demonstrates the technique using the restriction endonuclease NdeI. The method can easily be modified to study any process that results in site-specific DNA cleavage.
01:33
Cleavage and Blastulation
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2019
After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller. Zygotic Genome Activation At the beginning of embryogenesis, maternal mRNAs control development. However, by the eight-cell stage of cleavage, embryonic genes become activated in a process called...
10:00
Assaying DNA Damage in Hippocampal Neurons Using the Comet Assay
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Cited by 21 •
2012
The comet assay is an efficient way of detecting single- and double-strand breaks, including alkali-labile sites and DNA-DNA/DNA-protein cross-links on the DNA in all cells including hippocampal neurons. The method takes advantage of the differential migration of DNA in an electric field due to differences in amount of DNA damage.
07:33
Physical Properties Of Minerals I: Crystals and Cleavage
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2023
Source: Laboratory of Alan Lester - University of Colorado Boulder The physical properties of minerals comprise various measurable and discernible attributes, including color, streak, magnetic properties, hardness, crystal growth form, and crystal cleavage. Each of these properties are mineral-specific, and they are fundamentally related to a particular mineral’s chemical make-up and atomic structure. This experiment examines two properties that stem primarily from symmetric repetition of...
FAQs
Cleavage activity can be evaluated by changing one reaction variable at a time, such as enzyme concentration, incubation time, or cofactor availability. Comparing the resulting DNA products shows whether increased exposure to the candidate factor changes substrate loss or fragment production. This approach helps distinguish catalytic activity from conditions that limit reaction efficiency.
Sequence or structure dependence is inferred from how cleavage changes across DNA substrates with different sequence or structural contexts. A factor that cuts some substrates more readily than others may recognize particular features of the DNA. Measuring substrate loss or fragment formation under defined conditions therefore connects the observed reaction pattern with molecular recognition.
Substrate loss indicates that less intact DNA remains after incubation, whereas discrete fragments reveal a more defined cleavage pattern. Comparing these products with an untreated DNA sample helps separate cleavage-related changes from the original substrate profile. Together, the amount and distribution of DNA products describe both the extent and pattern of enzymatic action.
A typical workflow combines purified DNA with the candidate nuclease or other factor under defined reaction conditions. After incubation, the products are separated by gel electrophoresis and compared with an untreated control. The resulting bands or loss of intact substrate provide the experimental basis for deciding whether cleavage occurred and how extensively the DNA was affected.
Researchers can compare cleavage efficiency by varying enzyme concentration, incubation time, or cofactors while keeping the other conditions defined. The products are then evaluated for differences in substrate loss or fragment production. This systematic comparison identifies conditions associated with stronger or weaker activity and can show whether the reaction responds to a particular experimental variable.
In biochemistry, the assay connects molecular activity with measurable DNA products, making it useful for studying restriction enzymes, DNA repair, genome editing, and protein-DNA interactions. Researchers can examine whether a factor cuts DNA, determine how much cleavage occurs, and assess whether sequence or structural features influence the reaction. These outcomes support mechanistic characterization of DNA-processing factors.