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Related Concept Videos

Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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Translocation of Proteins into the Mitochondria01:19

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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DNA Topoisomerases02:02

DNA Topoisomerases

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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
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Mitochondrial Membranes01:45

Mitochondrial Membranes

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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Nucleosome Remodeling

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Related Experiment Video

Updated: Jun 8, 2025

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

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Structural changes in DNA by binding mitochondrion-targeted monofunctional platinum(II) complexes using molecular

Chaoqun Li1, Xiaojia Zhao1, Fangqian Yin1

  • 1Hebei Key Laboratory of Heterocyclic Compounds, College of Chemistry, Chemical Engineering and Materials, Handan University, Handan, 056005, Hebei province, China.

Journal of Inorganic Biochemistry
|November 4, 2024
PubMed
Summary
This summary is machine-generated.

Triphenylphosphonium (TPP) enhanced platinum(II) anticancer drugs by inducing significant DNA changes. Bulky carrier ligands on these mitochondrion-targeted agents may improve efficacy.

Keywords:
Carrier ligandConformational changesDNAMitochondrion-targeted monofunctional platinum(II) agentMolecular dynamics simulationTPP

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Related Experiment Videos

Last Updated: Jun 8, 2025

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Genome-wide Mapping of Drug-DNA Interactions in Cells with COSMIC Crosslinking of Small Molecules to Isolate Chromatin
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Genome-wide Mapping of Drug-DNA Interactions in Cells with COSMIC Crosslinking of Small Molecules to Isolate Chromatin

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Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Computational Chemistry

Background:

  • Triphenylphosphonium (TPP) is a potent mitochondrial targeting moiety.
  • Mitochondrion-targeted platinum(II) agents show promise as anticancer drugs.
  • The monofunctional platinum(II) agent OPT utilizes a TPP group for targeted delivery.

Purpose of the Study:

  • To investigate the impact of bulky bidentate carrier ligands on the efficacy of TPP-based platinum(II) anticancer agents.
  • To analyze DNA structural alterations induced by these novel platinum(II) complexes.
  • To establish structure-activity relationships for developing improved mitochondrion-targeted platinum drugs.

Main Methods:

  • Synthesis of two novel platinum(II) agents with bulky bidentate ligands, based on the OPT structure.
  • Molecular dynamics simulations to analyze DNA conformational changes.
  • Evaluation of helical parameters, base stacking, average structure, and principal component analyses.

Main Results:

  • Platinum(II) complexes featuring TPP and bulky carrier ligands induced more pronounced DNA conformational changes compared to OPT.
  • Significant alterations in DNA helical parameters and base stacking were observed.
  • Molecular dynamics simulations provided detailed insights into drug-induced DNA structural modifications.

Conclusions:

  • TPP-based monofunctional platinum(II) complexes with bulky carrier ligands demonstrate potential for enhanced anticancer efficacy.
  • Carrier ligand steric hindrance plays a crucial role in modulating DNA interactions and drug activity.
  • These findings offer a rational basis for designing next-generation mitochondrion-targeted platinum anticancer therapeutics.