Helicase Bypass Mechanism
Helicase Bypass Mechanism - Related Videos
00:55
DNA Helicases
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2020
DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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Cardiopulmonary Bypass in a Mouse Model: A Novel Approach
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This paper describes how to perform cardiopulmonary bypass in mice. This novel model will facilitate the investigation of the molecular mechanisms involved in organ damage.
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Single-Molecule Real-Time Visualization of DNA Unwinding by CMG Helicase
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This protocol demonstrates performing a single-molecule assay for live visualization of DNA unwinding by CMG helicase. It describes (1) preparing a DNA substrate, (2) purifying fluorescently labeled Drosophila melanogaster CMG helicase, (3) preparing a microfluidic flow cell for total internal reflection fluorescence (TIRF) microscopy, and (4) the single-molecule DNA unwinding assay.
04:10
Helicase Activity Measurement of a Target Protein Using Biotin-Labeled RNA Duplexes
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2025
In this video, we demonstrate the procedure to determine the helicase activity of a target protein to unwind the biotin-labeled dsRNA substrate. The activity of the enzyme was identified by analyzing the electrophoretic mobility shift, followed by a chemiluminescence assay using chemiluminescent enzyme-conjugated streptavidin.
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Roux-en-Y Gastric Bypass Operation in Rats
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Numerous studies using gastric bypass rat models have been recently conducted to uncover the underlying physiological mechanisms of Roux-en-Y gastric bypass operations. This article aims to demonstrate and discuss the technical and experimental details of our published gastric bypass rat model to understand advantages and limitations of this experimental tool.
FAQs
Replisome remodeling reorganizes the stalled replication machinery so that fork progression can resume without relying on the original helicase configuration. This restructuring may coordinate the replisome with alternative DNA-unwinding activities or with processing events at the fork. Its importance lies in preserving access to parental DNA while reducing the risk that a temporary blockage permanently interrupts genome duplication.
Alternative DNA-unwinding activities can provide a substitute route when the normal helicase cannot open a duplex region. Their recruitment allows the parental strands to become accessible to DNA polymerases, linking unwinding with continued synthesis. This route differs from simply waiting for the blocked helicase to recover because it actively supports replication-fork progression during the obstruction.
Unwinding alone does not restore replication unless DNA polymerases can use the newly accessible parental strands. Helicase bypass therefore depends on coordinated processing of the stalled fork, followed by productive polymerase access. This relationship explains why bypass is a fork-management strategy rather than an isolated unwinding event, and why poor coordination could compromise genome duplication.
Protein-DNA obstacles, replication stress, and damaged templates are central situations for studying this mechanism. Each can interfere with normal fork movement or strand accessibility, creating a need for fork recovery. Examining these conditions helps researchers connect local replication failure with broader outcomes, including altered genome stability, mutation formation, and defective recovery processes.
A conceptual analysis begins with failure of the normal helicase to unwind a duplex section, followed by examination of how the stalled fork is remodeled or processed. Researchers then assess whether an alternative unwinding activity or coordinated fork processing restores parental-strand access to DNA polymerases. The key outcome is continued replication rather than permanent fork disruption.
The mechanism provides a framework for examining how cells preserve genome duplication when replication forks encounter obstacles or damaged templates. Researchers can relate the success or failure of fork recovery to genome stability and mutation outcomes. This makes helicase bypass relevant to investigations of DNA repair and disease processes associated with defective replication-fork recovery.