Nuclease Polarity Analysis
Nuclease Polarity Analysis - Related Videos
12:04
Mouse Genome Engineering Using Designer Nucleases
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Cited by 14 •
2014
Designer nucleases such as zinc finger nucleases (ZFNs) and transcription activator-like effector nucleases (TALENs) can be used to modify the genome of mouse preimplantation embryos by triggering both the nonhomologous end joining (NHEJ) and homologous recombination (HR) pathways. These advances enable the rapid generation of mice with precise genetic modifications.
01:01
Group Polarization
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2020
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition. The phenomenon of group polarization explains many actions taken by groups that would not...
03:37
Molecular Shape and Polarity
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2020
Dipole Moment of a Molecule Polar covalent bonds connect two atoms with differing electronegativities, leaving one atom with a partial positive charge (δ+) and the other atom with a partial negative charge (δ–), as the electrons are pulled toward the more electronegative atom. This separation of charge gives rise to a bond dipole moment. The magnitude of a bond dipole moment is represented by the Greek letter mu (µ) and is given by the formula shown here, where Q is the magnitude of the...
08:13
Overexpressing and Purifying a Toxic Nuclease from Escherichia coli
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2025
This article describes a methodology for overexpressing recombinant Nsp15, a toxic nuclease, in a C41(DE3) expression system, followed by purification of the tagged protein utilizing affinity and size exclusion chromatography. These protocols can be adapted for other challenging toxic proteins.
07:50
Detection and Removal of Nuclease Contamination During Purification of Recombinant Prototype Foamy Virus Integrase
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Cited by 10 •
2017
Recombinant prototype foamy virus integrase protein is often contaminated with a bacterial nuclease during purification. This method identifies nuclease contamination and removes it from the final preparation of the enzyme.
FAQs
The decisive comparison uses otherwise comparable DNA or RNA substrates that differ in which end or strand carries the relevant configuration or label. If cleavage products differ between these substrates, the pattern indicates whether the enzyme favors the 5′ or 3′ end, or one strand over another. This design links product formation to substrate orientation rather than simply measuring total degradation.
Fragment sizes provide a time-resolved record of how cleavage proceeds. Early products can reveal the initial attack pattern, while later products show whether degradation continues directionally or produces a broader mixture of fragments. Comparing these products across reaction times helps distinguish a defined polarity from less directional cleavage and clarifies the enzyme’s overall degradation pattern.
The location and progression of products help separate activity classes. Cleavage that reflects processing from a substrate end supports exonuclease characterization, whereas products consistent with internal cutting support endonuclease characterization. Because the analysis also compares end configurations and follows products over time, it can connect this distinction with preferred direction and substrate recognition.
A nuclease may recognize one strand or substrate end more efficiently than another, so strand preference can be as informative as direction. Comparing labeled DNA or RNA substrates with altered strand or end configurations reveals whether cleavage depends on a particular nucleic-acid feature. These observations help explain substrate recognition and refine the enzyme’s catalytic behavior.
A typical workflow prepares labeled DNA or RNA substrates with different end configurations, exposes them to the nuclease, and collects reaction products over time. The products are then compared by fragment size and composition across substrate designs and time points. This combination of controlled substrate comparisons and temporal tracking supports assignment of cleavage direction and degradation pattern.
The key variables are the nucleic-acid type, the labeled end or strand, and the alternative end configurations used in parallel reactions. Interpretation focuses on which products appear, their sizes, and how those products change over time. Consistent differences between matched substrates provide evidence for end preference, strand preference, or a particular cleavage pattern.
This analysis is useful when researchers need to connect nuclease activity with DNA replication, DNA repair, RNA processing, or genome stability. By revealing direction, substrate preference, and degradation behavior, it adds functional detail beyond detecting nuclease activity alone. The resulting profile can help place an enzyme within a broader nucleic-acid maintenance or processing pathway.
Polarity results provide experimentally measured features for assigning a newly identified nuclease a more specific functional profile. Directional activity, end or strand preference, and product progression can be compared with the requirements of replication, repair, RNA processing, or genome-stability studies. This evidence helps connect sequence-based discovery with observed catalytic behavior and likely biological relevance.