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Related Concept Videos

The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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...
Structure of Porins01:21

Structure of Porins

Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel precursors...
Electron Transport Chains01:28

Electron Transport Chains

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...

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Related Experiment Video

Updated: May 10, 2026

Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models
08:48

Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models

Published on: June 30, 2023

Inner membrane dynamics in mitochondria.

Daniel Dikov1, Juergen Bereiter-Hahn2

  • 1Kinematic Cell Research Group, Institute for Cell Biology and Neurosciences, Goethe University Frankfurt, Max-von-Laue Strasse 13, 60438 Frankfurt am Main, Germany; Mitochondrial Biology Group, Buchmann Institute for Molecular Life Sciences, Goethe University Frankfurt, Max-von-Laue Strasse 15, 60438 Frankfurt am Main, Germany.

Journal of Structural Biology
|June 25, 2013
PubMed
Summary
This summary is machine-generated.

Mitochondrial cristae dynamics were visualized using non-saturation fluorescence microscopy (NSFM). Cristae positions are stable but dynamically change near cell division sites, with movements reduced by oligomycin.

Keywords:
Cristae dynamicsCristae – matrix visualizationFPALMGFPIMMIMPMitochondriaNSFMNon-saturation fluorescence microscopy (NSFM)OMMROSSOFISTEDTMREfluorescence photoactivation localization microscopygreen fluorescent proteininner mitochondrial membraneinner mitochondrial membrane proteinmitochondrial membrane potentialnon-saturation fluorescence microscopyouter mitochondrial membranepixelpxreactive oxygen speciesstimulated emission depletion – microscopysuper-resolution optical fluctuation imagingtetramethylrhodamine ethylesterΔψ

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Last Updated: May 10, 2026

Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models
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Published on: June 30, 2023

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Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue
09:27

Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue

Published on: March 23, 2015

Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Microscopy Techniques

Background:

  • Mitochondria possess a complex internal structure with cristae crucial for ATP production.
  • Understanding cristae dynamics is vital for comprehending mitochondrial function and cellular health.

Purpose of the Study:

  • To visualize and analyze the dynamic behavior of mitochondrial cristae in living cells.
  • To investigate the spatial and temporal distribution of mitochondrial components.

Main Methods:

  • Utilized non-saturation fluorescence microscopy (NSFM) with IMP-EGFP labeled cells.
  • Employed sub-saturating fluorescence excitation and deconvolution techniques for enhanced resolution.
  • Combined spatial and temporal fluorescence intensity analysis of mitochondria.

Main Results:

  • Revealed inhomogeneous spatial and temporal fluorescence distribution along mitochondria, reflecting cristae and matrix organization.
  • Observed dynamic cristae movements ('wobbling') with temporal fluctuations of 0.3-3s.
  • Demonstrated that cristae positions are generally stable but disassemble near fission sites, with oligomycin reducing wobbling.

Conclusions:

  • Mitochondrial cristae exhibit dynamic behavior, including stable positioning with localized disassembly during fission.
  • NSFM provides high temporal resolution for studying mitochondrial substructure dynamics.
  • Oligomycin treatment impacts cristae dynamics, suggesting a link to mitochondrial energy metabolism.