Related Experiment Video
Updated: Jun 28, 2026

Analytical Determination of Mitochondrial Function of Excised Solid Tumor Homogenates
Published on: August 6, 2021
Heterogeneity of osmium oxidation efficiency at consecutive thymines
Akiko Nomura1, Akimitsu Okamoto
1Advanced Science Institute, RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-1098, Japan.
Consecutive thymine sequences, like thymine-thymine, are oxidized more efficiently by a specific chemical mixture. Osmium oxidation of the first thymine in a thymine-thymine sequence is particularly rapid.
Area of Science:
- Chemical oxidation mechanisms
- DNA damage and repair
Background:
- Thymine bases in DNA are susceptible to oxidative damage.
- Understanding sequence-dependent reactivity is crucial for DNA chemistry.
Purpose of the Study:
- To investigate the oxidation efficiency of consecutive thymine sequences.
- To compare the reactivity of isolated thymines versus thymines in tandem.
Main Methods:
- Utilized a chemical oxidation system comprising potassium osmate, potassium hexacyanoferrate(III), and bipyridine.
- Analyzed the oxidation rates of isolated thymine and consecutive thymine sequences (e.g., TT).
Main Results:
- Consecutive thymine sequences exhibited higher oxidation efficiency compared to isolated thymines.
- Osmium oxidation occurred significantly faster at the 5' thymine within a thymine-thymine (TT) dimer.
Conclusions:
- The sequence context, specifically adjacent thymines, enhances oxidative susceptibility.
- The 5' thymine in a TT sequence is a preferential site for osmium-mediated oxidation.
More Related Videos
06:53Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
09:53High-Resolution Respirometry to Assess Bioenergetics in Cells and Tissues Using Chamber- and Plate-Based Respirometers
Published on: October 26, 2021
Related Concept Videos
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Redox Titration: Other Oxidizing and Reducing Agents
Properties of Transition Metals
Oxidation of Phenols to Quinones
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...
Oxidation Numbers
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate