Mitochondrial Transport
Mitochondrial Transport - Related Videos
04:50
Neuromodulation and Mitochondrial Transport: Live Imaging in Hippocampal Neurons over Long Durations
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Cited by 7 •
2011
We describe a protocol that allows imaging of mitochondria in living neurons via fluorescence microscopy over long durations. Imaging over extended periods is accomplished through lentivirus-mediated expression of a mitochondrially targeted fluorescent protein and use of an inexpensive stage-top incubator that was designed and built in our laboratory.
01:34
Protein Transport into the Inner Mitochondrial Membrane
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2023
Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation. Transport of mitochondrial precursors across the TIM23 channel is driven by...
08:37
Analyzing Supercomplexes of the Mitochondrial Electron Transport Chain with Native Electrophoresis, In-gel Assays, and Electroelution
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Cited by 15 •
2017
This protocol describes the separation of functional mitochondrial electron transport chain complexes (Cx) I-V and supercomplexes thereof using native electrophoresis to reveal information about their assembly and structure. The native gel can be subjected to immunoblotting, in-gel assays, and purification by electroelution to further characterize individual complexes.
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...
02:59
Animal Mitochondrial Genetics
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2020
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
FAQs
The two membranes create distinct transport conditions. Porins in the outer membrane permit exchange, while the inner membrane remains selective and relies on carrier proteins, translocases, and electrochemical gradients. Consequently, the same molecule may encounter relatively open passage at the outer boundary but regulated movement at the inner boundary, making membrane location essential when interpreting mitochondrial transport.
Many mitochondrial proteins are encoded in the nucleus and must be delivered to the organelle. Translocases provide part of the machinery that directs these proteins across mitochondrial membranes, whereas the membrane barriers and associated gradients help control movement. Studying this process connects gene expression in the nucleus with the mitochondrial proteins required for organelle function.
Transport systems help maintain calcium and redox balance between mitochondria and the surrounding cytoplasm. These exchanges link mitochondrial activity with broader cellular conditions rather than isolating the organelle from its environment. Examining them can therefore clarify how mitochondria coordinate metabolism and how altered transport may contribute to cellular stress or apoptosis.
Researchers can examine how substrates reach the systems that support oxidative phosphorylation, the process associated with mitochondrial energy production. Comparing transport across the outer and inner membranes helps identify where selective entry or carrier activity may influence substrate availability. This approach connects membrane-level movement with the organelle’s capacity to participate in cellular energy metabolism.
A useful investigation can distinguish among transported proteins, metabolites, ions, and other molecules while considering the membrane through which each moves. It should also account for porins, carrier proteins, translocases, and electrochemical gradients as separate regulatory features. Organizing observations this way helps relate molecular movement to mitochondrial metabolism, calcium regulation, and redox control.
Mitochondrial transport provides a framework for studying how cells adjust metabolism and how mitochondrial dysfunction develops. Disrupted movement of proteins, substrates, ions, or redox-related components could affect energy production and communication with the cytoplasm. For this reason, transport studies are relevant to metabolic adaptation, apoptosis, and diseases associated with impaired mitochondrial function.