Complex Iii Inhibition
Complex Iii Inhibition - Related Videos
09:00
An In Vitro Enzymatic Assay to Measure Transcription Inhibition by Gallium(III) and H3 5,10,15-tris(pentafluorophenyl)corroles
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Cited by 1 •
2015
Gallium(III) 5,10,15-(tris)pentafluorophenylcorrole and its freebase analogue exhibit low micromolar cell cytotoxicity. This manuscript describes an RNA transcription reaction, imaging RNA with an ethidium bromide-stained gel, and quantifying RNA with UV-Vis spectroscopy, in order to assess transcription inhibition by corroles and demonstrates a straightforward method of evaluating anticancer candidate properties.
01:43
Electron Transport Chain: Complex III and IV
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2023
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
09:34
Identification of Growth Inhibition Phenotypes Induced by Expression of Bacterial Type III Effectors in Yeast
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Cited by 33 •
2010
In this video, we describe a procedure for the expression of bacterial type III effectors in yeast and the identification of effector-induced growth inhibition phenotypes. Such phenotypes can be subsequently exploited to elucidate effector functions and targets.
11:22
Investigations on the Ga(III) Complex of EOB-DTPA and Its 68Ga Radiolabeled Analogue
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Cited by 2 •
2016
A procedure for the isolation of EOB-DTPA and subsequent complexation with natural Ga(III) and 68Ga is presented herein, as well as a thorough analysis of all compounds and investigations on labeling efficiency, in vitro stability and the n-octanol/water distribution coefficient of the radiolabeled complex.
00:46
Feedback Inhibition
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2019
Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell! Since enzymes help control the rate of reactions, their activity is regulated so that appropriate amounts of starting materials, intermediate metabolites, and products are maintained in the cell. Excessive build-up or depletion of...
FAQs
These sites provide distinct points at which an inhibitor can interfere with electron transfer through the cytochrome bc1 complex. Because the Q cycle links ubiquinol oxidation with electron delivery to cytochrome c and proton-gradient formation, blocking either site can disrupt the coordinated reactions that support oxidative phosphorylation. Site-specific comparisons therefore help identify where respiration is being interrupted.
When electron transfer through the cytochrome bc1 complex is blocked, mitochondrial electron handling is disturbed rather than proceeding normally through the respiratory pathway. The overview identifies this disruption as a source of increased reactive oxygen species, or ROS. Measuring ROS alongside respiratory effects can therefore reveal a consequence of inhibition that is not captured by ATP measurements alone.
Reduced electron transfer limits the respiratory processes that establish the inner-membrane proton gradient. Since that gradient supports oxidative phosphorylation, inhibition can lower ATP synthesis and alter mitochondrial membrane potential. Considering both readouts is important: ATP reflects the energy-production consequence, whereas membrane potential indicates a change in the electrochemical state of the mitochondrion.
Useful outcomes include the efficiency of electron transfer, ATP synthesis, the proton gradient, membrane potential, and mitochondrial ROS. Together, these measurements distinguish several consequences of the same respiratory blockage: impaired energy production, altered membrane energetics, and oxidative changes. Examining multiple outcomes gives a broader bioenergetic profile than relying on a single indicator.
By experimentally disrupting a defined step in oxidative phosphorylation, Complex III inhibition provides a way to examine how impaired respiration affects cellular energy production and mitochondrial state. Researchers can relate changes in ATP, membrane potential, and ROS to disease-associated bioenergetic problems. The approach is therefore useful for connecting a respiratory defect with measurable cellular consequences.
It can reveal whether a toxicant interferes with mitochondrial respiration or whether a candidate compound acts on cellular energy production. The key evidence comes from changes in electron transfer, ATP synthesis, membrane potential, and ROS after inhibition. This makes the system useful for comparing respiratory effects and identifying compounds that target cellular respiration.