Complex Iii Dimer
Complex Iii Dimer - Related Videos
06:50
Synthesis Of A Ti(III) Metallocene Using Schlenk Line Technique
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2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University Inorganic chemists often work with highly air- and water-sensitive compounds. The two most common and practical methods for air-free synthesis utilize either Schlenk lines or gloveboxes. This experiment will demonstrate how to perform simple manipulations on a Schlenk line with a focus on solvent preparation and transfer. Through the synthesis of a reactive Ti(III) metallocene complex, we will demonstrate a new, simple...
10:39
Visualization of ATP Synthase Dimers in Mitochondria by Electron Cryo-tomography
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Cited by 43 •
2014
We present a protocol of how to collect and process electron cryo-tomograms of whole mitochondria. The technique provides detailed insights into the structure, function, and organization of large membrane protein complexes in native biological membranes.
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...
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.
03:45
Formation of Complex Ions
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2020
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
FAQs
During the Q cycle, electrons from ubiquinol are transferred through the complex toward cytochrome c rather than moving directly in a single step. At the same time, protons are released across the inner mitochondrial membrane. This coordinated electron and proton movement converts oxidation energy into a membrane gradient that supports downstream ATP production.
The heme-containing cytochromes and iron–sulfur proteins provide essential components for electron transfer within the dimer. Their coordinated participation allows electrons originating from ubiquinol to reach cytochrome c. Because these components are embedded in the respiratory enzyme, their arrangement links molecular electron movement with proton release across the inner mitochondrial membrane.
The two monomers do more than simply increase the amount of respiratory protein present. They cooperate within one membrane-bound dimer while containing the cytochromes and iron–sulfur proteins needed for electron transfer. This organization is important for understanding how the complex performs its Q-cycle activity as part of mitochondrial respiration.
Its activity contributes indirectly to ATP formation by releasing protons across the inner mitochondrial membrane during electron transfer. The resulting proton gradient stores energy across the membrane, and ATP synthase uses that gradient to support ATP production. Thus, changes in Complex III activity can influence how nutrient oxidation is connected to cellular energy generation.
Studying respiratory-chain inhibitors can reveal how disrupting the complex changes electron flow. Because the enzyme normally transfers electrons from ubiquinol toward cytochrome c while releasing protons, inhibitor effects can be considered in relation to both electron movement and proton-gradient formation. This makes the complex useful for investigating altered mitochondrial bioenergetics.
The dimer provides a focused system for examining how mitochondrial respiration supports cellular energy production. Its role in linking nutrient oxidation, electron transfer, proton-gradient formation, and ATP synthesis makes it relevant to bioenergetic disorders. Researchers can use this connection to relate changes in respiratory-chain function to impaired cellular energy generation.