Respiratory Chain
Respiratory Chain - Related Videos
03:10
Blue Native Polyacrylamide Gel Electrophoresis: A Non-Denaturing Separation Technique for Analysis of Intact Mitochondrial Respiratory Chain Complexes
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2025
In this video, we demonstrate an electrophoretic technique, called blue native PAGE, for the analysis of mitochondrial respiratory protein complexes in their natively folded and functionally active state. The anionic Coomassie blue dye causes the protein complexes to become negatively charged, allowing separation based on size and structure.
11:25
Hybrid Clear/Blue Native Electrophoresis for the Separation and Analysis of Mitochondrial Respiratory Chain Supercomplexes
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Cited by 7 •
2019
Here we present a protocol to extract, resolve and identify mitochondrial supercomplexes which minimizes exposure to detergents and Coomassie Blue. This protocol offers an optimal balance between resolution, and preservation of enzyme activities, while minimizing the risk of losing labile protein-protein interactions.
01:28
Electron Transport Chains
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2019
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle. The ETC is comprised of...
13:10
Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique
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Cited by 130 •
2013
The present protocol provides a detailed step-by-step description of the procedures required to execute measurements of respiratory system mechanics as well as the assessment of airway responsiveness to inhaled methacholine in mice using the forced oscillation technique (flexiVent; SCIREQ Inc, Montreal, Qc, Canada).
09:59
Respiratory Exam I: Inspection and Palpation
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2023
Source: Suneel Dhand, MD, Attending Physician, Internal Medicine, Beth Israel Deaconess Medical Center Disorders of the respiratory system with a chief complaint of shortness of breath are among the most common reasons for both outpatient and inpatient evaluation. The most obvious visible clue to a respiratory problem will be whether the patient is displaying any signs of respiratory distress, such as fast respiratory rate and/or cyanosis. In a clinical situation, this will always require...
FAQs
Electron transfer proceeds through complexes I–IV, with electrons supplied by NADH and FADH₂. As the electrons move, complexes I, III, and IV capture part of their energy by pumping protons across the inner mitochondrial membrane. This separates electron movement from ATP formation while linking both processes through the proton gradient.
The proton gradient stores energy as an electrochemical difference across the inner mitochondrial membrane. ATP synthase taps that stored energy to produce ATP, converting the gradient generated by the chain into a usable cellular energy supply. Without proton separation, this ATP-producing step lacks its stated energy source.
Oxygen has a specific terminal role: it accepts electrons after their passage through the chain and forms water. This endpoint allows the transfer sequence to proceed toward completion in aerobic respiration. Consequently, oxygen availability is directly tied to the pathway’s ability to couple electron movement with proton-gradient formation and subsequent ATP production.
When analyzing the respiratory chain in biology, follow the pathway in order: identify NADH and FADH₂ as electron sources, trace passage through complexes I–IV, note proton pumping by complexes I, III, and IV, and connect the gradient to ATP synthase. Finally, account for oxygen accepting electrons and water formation.
Research on the respiratory chain connects molecular energy conversion with broader biological outcomes. Examining how electron transfer, proton pumping, and ATP synthesis are altered helps frame questions about mitochondrial disease, aging, and exposure to drugs or toxins. The pathway therefore provides a mechanistic context for investigating how disrupted energy production may affect cells.
The inner mitochondrial membrane is essential because it houses the membrane-bound complexes and separates the regions across which protons are moved. That arrangement permits an electrochemical gradient to form and gives ATP synthase access to the stored gradient. The membrane is therefore the structural basis for coupling respiration to ATP production.