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Related Concept Videos

Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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The Supercomplexes in the Crista Membrane01:41

The Supercomplexes in the Crista Membrane

The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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.
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The Electron Transport Chain

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Non-inclusion complexes between riboflavin and cyclodextrins.

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Area of Science:

  • Pharmaceutical Chemistry
  • Molecular Interactions
  • Cancer Biology

Background:

  • Riboflavin (RF), a vitamin B2 derivative, has shown potential anticancer properties.
  • Cyclodextrins (CDs), specifically β-cyclodextrin (βCD) and hydroxypropyl-β-cyclodextrin (HPβCD), are known for their ability to form inclusion complexes and enhance drug solubility.
  • Understanding the interaction between RF and CDs is crucial for developing effective drug delivery systems.

Purpose of the Study:

  • To investigate the molecular interactions between β-cyclodextrin (βCD) or hydroxypropyl-β-cyclodextrin (HPβCD) and riboflavin (RF).
  • To evaluate the anticancer potential of these riboflavin-cyclodextrin formulations against prostate cancer cells.

Main Methods:

  • Physicochemical characterization using UV-vis absorption, fluorescence, differential scanning calorimetry, and NMR spectroscopy.
  • Molecular dynamics simulations to elucidate the interaction mechanism.
  • In-vitro cytotoxicity assays on PC3 prostate cancer cells.

Main Results:

  • RF-βCD and RF-HPβCD complexes showed increased RF solubility.
  • Molecular dynamics simulations indicated 'out-of-ring' interactions between RF and CDs.
  • Both RF-βCD and RF-HPβCD complexes demonstrated significant cytotoxicity against PC3 prostate cancer cells.

Conclusions:

  • The interaction between RF and CDs primarily involves hydrogen bonding with the external rim of the cyclodextrins at low concentrations.
  • RF-CD complexation significantly enhances RF solubility.
  • These complexes potentiate the antitumour effect of RF, suggesting therapeutic potential for prostate cancer treatment.