Outer Mitochondrial Membrane
Outer Mitochondrial Membrane - Related Videos
01:12
Porin Insertion in the Outer Mitochondrial Membrane
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2023
Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane. Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
11:06
Method for the Isolation of Francisella tularensis Outer Membranes
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Cited by 11 •
2010
A protocol for separating inner and outer membranes from Francisella tularensis by spheroplasting, osmotic lysis, and sucrose density gradient ultracentrifugation.
03:47
Separation of Inner and Outer Membrane Fractions of Gram-Negative Bacteria
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2025
Source: Cian, M. B. et. al., Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii. J. Vis. Exp. (2020)This video demonstrates the separation of the inner and outer membrane fractions of Gram-negative bacteria using sucrose gradient ultracentrifugation. The membrane fractions are purified and stored at low temperatures for targeted analysis of membrane-specific components.
01:28
The Inner Mitochondrial Membrane
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2023
The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria. In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
08:43
Simultaneous Measurement of Mitochondrial Calcium and Mitochondrial Membrane Potential in Live Cells by Fluorescent Microscopy
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Cited by 29 •
2017
Mitochondria can utilize the electrochemical potential across their inner membrane (ΔΨm) to sequester calcium (Ca2+), allowing them to shape cytosolic Ca2+ signaling within the cell. We describe a method for simultaneously measuring mitochondria Ca2+ uptake and ΔΨm in live cells using fluorescent dyes and confocal microscopy.
FAQs
Channel proteins such as voltage-dependent anion channels provide passageways for many small metabolites and ions between the cytosol and mitochondrion. This permeability supports access to substances needed for energy metabolism while preserving the membrane as a regulated boundary. Changes in channel behavior can therefore influence mitochondrial exchange and the cell’s metabolic coordination.
Translocase complexes in the outer mitochondrial membrane recognize and help import proteins encoded by nuclear genes. These proteins are produced outside the mitochondrion but must enter the organelle to support its functions. Interactions with cytosolic factors and the inner membrane help regulate this traffic, linking protein targeting at the boundary with mitochondrial maintenance.
The outer mitochondrial membrane permits many small metabolites and ions to pass, whereas its interactions with the inner membrane help coordinate transport into the organelle. This arrangement gives the two membranes complementary roles: the outer layer manages exchange with the cytosol, while coordinated membrane interactions regulate delivery and mitochondrial activity more broadly.
During apoptosis, increased permeability allows cytochrome c to leave the mitochondrion and contribute to caspase activation. This converts a change in membrane properties into a signaling event that promotes programmed cell death. Studying this transition helps connect mitochondrial membrane regulation with the cellular mechanisms that determine whether a cell survives or undergoes elimination.
A useful investigation can focus on three linked features: membrane composition, dynamic changes in permeability, and protein transport through translocase complexes. Examining these features together clarifies how the boundary supports metabolite exchange, nuclear-encoded protein import, and communication with other mitochondrial components. The resulting information can explain how membrane organization contributes to cellular energy metabolism.
Its transport and signaling functions connect the membrane to several disease-related areas identified in biology research, including metabolic disorders and neurodegeneration. Its role in cytochrome c release and caspase activation also makes it relevant to cancer biology, where controlling programmed cell death is an important research focus. These links support investigation of potential therapeutic targets.