Proton Leak
Proton Leak - Related Videos
08:29
Measuring Liver Mitochondrial Oxygen Consumption and Proton Leak Kinetics to Estimate Mitochondrial Respiration in Holstein Dairy Cattle
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Cited by 5 •
2018
Here, we share methods for measuring mitochondrial oxygen consumption, a defining concept of nutritional energetics, and proton leak, the primary cause of inefficiency in mitochondrial generation of ATP. These results can account for 30% of the energy lost in nutrient utilization to help evaluate mitochondrial function.
09:40
Proton Exchange Membrane Fuel Cells
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University The United States consumes a large amount of energy – the current rate is around 97.5 quadrillion BTUs annually. The vast majority (90%) of this energy comes from non-renewable fuel sources. This energy is used for electricity (39%), transportation (28%), industry (22%), and residential/commercial use (11%). As the world has a limited supply of these non-renewable sources, the United States (among others) is...
01:07
Proton (¹H) NMR: Chemical Shift
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2024
Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal. Absorption signals of all the protium nuclei in a...
07:38
Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
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Cited by 4 •
2015
The first part of this article shows how to select mutant cell lines expressing vesicular Na+/H+ exchangers at their plasma membrane. The second part provides protocols based on intracellular pH measurements and fast ion uptake, which are used to determine the ion selectivity and the kinetic parameters of these exchangers.
06:39
An Optimized Evans Blue Protocol to Assess Vascular Leak in the Mouse
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Cited by 68 •
2018
In this article, an economical, optimized, and simple protocol is described which uses the Evans blue dye method for assessing plasma extravasation in the organs of FVBN mice that can be adapted for use in other strains, species, and other organs or tissues.
FAQs
The key consequence of proton leak is a weaker connection between electron transport and ATP synthesis. Normally, the proton motive force stores energy that ATP synthase can use; bypassing that route dissipates part of the gradient instead. Consequently, electron transport may continue without converting all available membrane-stored energy into ATP, reducing overall energy-conversion efficiency.
These components represent distinct pathways through which protons can bypass ATP synthase. Lipid bilayers can permit proton movement, while membrane proteins and specialized uncoupling proteins can provide additional routes across the membrane. Their contribution matters because the extent and regulation of bypass determine how much proton motive force is dissipated rather than used for ATP production.
The amount of leak determines how efficiently stored membrane energy becomes ATP. A controlled leak can redirect some energy away from ATP synthesis, whereas an excessive leak may substantially reduce ATP yield and increase metabolic stress. Thus, proton leak links membrane behavior with broader changes in cellular energy balance and mitochondrial performance.
In mitochondria, controlled proton leak dissipates stored energy from the proton motive force without using that energy to drive ATP synthase. Instead of being captured primarily as ATP, part of the energy is released as heat. This mechanism connects membrane proton movement with thermogenesis, the biological production of heat.
Studying proton leak can show how closely mitochondrial electron transport is coupled to ATP production and how much energy is diverted from that pathway. The resulting perspective helps explain mitochondrial energy balance, changes in ATP yield, controlled heat production, and the effects of excessive leak on metabolic stress.
Proton leak provides a framework for understanding how cells regulate energy conversion under different metabolic conditions. Controlled leakage can contribute to thermogenesis, while excessive leakage may impair ATP production and increase metabolic stress. These effects make the process relevant to mitochondrial function and to investigating metabolic changes associated with health and disease.