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Related Experiment Video

Updated: Jun 1, 2026

DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering

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Published on: November 9, 2017

Metal Complexes for DNA-Mediated Charge Transport.

Jacqueline K Barton¹, Eric D Olmon, Pamela A Sontz

¹Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

Coordination Chemistry Reviews

|June 7, 2011

Summary

DNA-mediated charge transport (CT) is crucial for genome integrity, influencing both oxidative damage and repair. This research explores how DNA CT efficiency depends on distance and metal complex stacking, revealing its role in cellular redox regulation.

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Published on: September 7, 2019

Area of Science:

Biochemistry
Molecular Biology
Bioinorganic Chemistry

Background:

Oxidative stress poses a constant threat to genomic integrity in all organisms.
DNA-mediated charge transport (CT) is increasingly recognized for its potential role in DNA damage and repair processes.
Understanding the mechanisms of DNA CT is vital for comprehending cellular responses to oxidative damage.

Purpose of the Study:

To investigate the efficiency of long-range DNA-mediated charge transport (CT) using synthetic metal complexes.
To examine the influence of distance, temperature, and metal complex stacking on DNA CT efficiency.
To explore the role of DNA CT in biological processes, including DNA repair and cellular redox regulation.

Main Methods:

Utilized intercalating Ruthenium (Ru) and Rhodium (Rh) complexes to study DNA-mediated CT to specific DNA sequences (5'-GG-3').
Employed cyclopropylamine-modified bases to investigate charge occupation along the DNA bridge.
Investigated DNA-mediated reduction using Iridium (Ir) complexes and studied the DNA-dependence of metalloprotein redox activity.

Main Results:

Demonstrated a shallow distance dependence for DNA CT, with efficiency highly sensitive to the stacking of metal complexes within the DNA helix.
Confirmed charge occupation at all sites along the DNA bridge in modified bases.
Showed that DNA-mediated reduction mirrors oxidation, and metalloprotein redox activity is DNA-dependent and can be DNA-mediated.

Conclusions:

Long-range DNA CT is a significant factor in genomic maintenance, facilitating DNA repair protein oxidation and activating cellular stress responses (e.g., SoxR).
Redox-active proteins within cells may employ similar charge transport mechanisms as synthetic metal complexes studied in vitro.
DNA-mediated CT represents a key mechanism for cells to mitigate genomic damage and regulate cellular processes.