Related Experiment Video
Updated: Apr 17, 2026
09:33
Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
Published on: March 20, 2018
14.5K
DNA-protective activities of hyperforin and aristoforin
A Ševčovičová1, M Šemeláková2, J Plšíková3
1Department of Genetics, Faculty of Natural Sciences, Comenius University, Mlynská dolina, 842 15 Bratislava, Slovakia.
Summary
Hyperforin and aristoforin from St. John's Wort offer partial DNA protection by scavenging free radicals. Their antioxidant activity explains their DNA-protective mechanisms.
Area of Science:
- Natural Product Chemistry
- Molecular Biology
- Biochemistry
Background:
- Hyperforin is a phloroglucinol derivative from Hypericum perforatum L.
- Aristoforin is a more stable derivative of hyperforin.
- Understanding their molecular mechanisms is crucial for potential therapeutic applications.
Purpose of the Study:
- To elucidate the molecular mechanisms of action of hyperforin and aristoforin.
- To investigate their DNA-protective activities.
- To assess their antioxidant properties and interaction with DNA.
Main Methods:
- DNA-topology assay to evaluate DNA protection against Fe(2+)-induced breaks.
- Antioxidant assays including DPPH and hydroxyl radical scavenging, reducing power, and Fe(2+)-chelating assays.
- Fluorescence titration to study compound-DNA interactions and electrophoretic techniques to assess topoisomerase I activity.
Main Results:
- Hyperforin and aristoforin demonstrated partial DNA-protective effects against Fe(2+)-induced DNA breaks.
- Both compounds exhibited antioxidant activities, including free radical scavenging.
- Fluorescence titration revealed an interaction between hyperforin and DNA with a binding constant of 0.2×10(8)M(-1).
Conclusions:
- The DNA-protective abilities of hyperforin and aristoforin are likely mediated by their free radical scavenging activity, particularly hydroxyl radicals.
- These findings suggest a potential role for these compounds in mitigating DNA damage.
- Further research into their therapeutic potential is warranted.
Keywords:
AristoforinDNA unwinding assayDNA-topology assayDPPH()/()OH scavenging activityHyperforinReducing power assayMore Related Videos
12:41Application of an In vitro DNA Protection Assay to Visualize Stress Mediation Properties of the Dps Protein
Published on: May 31, 2013
11.7K
11:06Network Pharmacology Prediction and Metabolomics Validation of the Mechanism of Fructus Phyllanthi against Hyperlipidemia
Published on: April 7, 2023
3.0K
Related Concept Videos
01:29Diversity of Archaea IV
628
Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...
628
01:30Inhibitors of Viral Protein Synthesis
37
Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
37
02:31Protection of Alcohols
8.2K
This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
8.2K
01:15Antifungal Agents
103
Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to...
103
01:23Protecting Groups for Aldehydes and Ketones: Introduction
9.8K
Protecting groups are compounds that can bind to a specific functional group in the presence of other functional groups to protect them from undesired chemical reactions. These compounds can selectively bind to particular functional groups and advance chemoselective reactions in polyfunctional systems (Figure 1). After the functional group has served its purpose, it is removed by reacting it with specific compounds.
9.8K
01:27Diversity of Archaea III
466
Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...
466