Atp-linked Respiration
Atp-linked Respiration - Related Videos
01:31
ATP Yield
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2019
Cellular respiration produces 30 - 32 ATP per glucose molecule. Although most of the ATP results from oxidative phosphorylation and the electron transport chain (ETC), 4 ATP are gained beforehand (2 from glycolysis and 2 from the citric acid cycle). The ETC is embedded in the inner mitochondrial membrane and is comprised of four main protein complexes and an ATP synthase. NADH and FADH2 pass electrons to these complexes, which pump protons into the intermembrane space. This distribution of...
05:00
Cellular Respiration - Concepts
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2019
Autotrophs and Heterotrophs Living organisms require a continuous input of energy to maintain cellular and organismal functions such as growth, repair, movement, defense, and reproduction. Cells can only use chemical energy to fuel their functions, therefore they need to harvest energy from chemical bonds of biomolecules, such as sugars and lipids. Autotrophic organisms, namely plants, algae, and photosynthetic and chemosynthetic bacteria, convert inorganic materials into such biomolecules by...
05:44
Cellular Respiration - Student Protocol
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2019
Quantifying Respiration using Microrespirometers ExpandNOTE: In this experiment, you will measure the rate of cellular respiration for germinating seeds by measuring the rate of exchange for oxygen. As oxygen is consumed to provide energy, germinating seeds release carbon dioxide. This carbon dioxide is absorbed by potassium carbonate and thus the overall gaseous pressure of the respirometer will be reduced. HYPOTHESES: The experimental hypothesis is that germinating seeds will show a greater...
08:32
The ATP Bioluminescence Assay
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2023
In fireflies, the luciferase enzyme converts a compound called luciferin into oxyluciferin, and produces light or “luminescence” as a result. This reaction requires energy derived from ATP in order to proceed, so researchers have exploited the luciferase-luciferin interaction to gauge ATP levels in cells. Given ATP’s role as the cell’s currency of energy, the ATP bioluminescence assay can provide insight into cellular metabolism and overall cell health.In this video, JoVE discusses cellular...
01:08
Hydrolysis of ATP
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2019
The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids. If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
FAQs
The inner-membrane proton gradient stores energy created during electron transport. ATP synthase captures that energy as protons flow back across the membrane, driving phosphorylation of ADP. If electron transport continues but proton return is not effectively coupled to phosphorylation, oxygen consumption may no longer reflect ATP production accurately. This coupling is therefore central to interpreting mitochondrial energy output.
Measurements of ATP-linked respiration help separate energy use for ATP synthesis from other mitochondrial oxygen-consuming processes. A reduced ATP-generating component can indicate impaired phosphorylation, whereas altered proton leak reflects inefficient return of protons that does not directly produce ATP. Respiratory capacity provides another comparison, helping determine whether the limitation involves ATP synthesis specifically or broader respiratory function.
Respiratory substrates provide the inputs that sustain electron transport, while oxygen supports continued activity of the respiratory chain. Changes in either can influence the observed oxygen consumption and complicate interpretation of ATP production. Considering these requirements helps researchers determine whether an altered measurement reflects mitochondrial energy conversion or inadequate support for the electron-transport process itself.
A change indicates that the relationship between electron transport, the proton gradient, and phosphorylation has shifted. The result can point toward impaired ATP synthesis, altered proton leak, or a broader change in respiratory capacity, depending on the accompanying measurements. This distinction is useful because similar reductions in oxygen consumption can arise from different mitochondrial defects.
Researchers measure ATP-linked respiration to examine how immune-cell activation, pathogen exposure, or metabolic stress changes mitochondrial energy production. The measurements connect cellular stimulation with the function of oxidative phosphorylation rather than treating metabolism as a separate process. This provides a way to investigate whether immune or infection-related conditions alter the energy supply needed for cellular responses.
ATP-linked respiration provides metabolic information that can be interpreted alongside immune or infection-related conditions. If activation or pathogen exposure changes the ATP-producing portion of oxygen consumption, the finding may reveal altered mitochondrial support for cellular function. Such results help clarify how metabolic remodeling is connected to inflammation and host defense, while distinguishing energy-production changes from proton leak or respiratory-capacity effects.