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Related Concept Videos

Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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...
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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,...
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...
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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,...

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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

A replicating module as the unit of mitochondrial structure and functioning.

Roderick A Capaldi1, Robert Aggeler, Robert Gilkerson

  • 1Institute of Molecular Biology, University of Oregon, Eugene, OR 97403-1229, USA. rcapaldi@oregon.uoregon.edu

Biochimica Et Biophysica Acta
|September 27, 2002
PubMed
Summary
This summary is machine-generated.

Human cell mitochondria are dynamic, changing shape and moving via cytoskeletal attachments. This suggests a "replicating module" model for mitochondrial structure and function.

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Area of Science:

  • Cell Biology
  • Mitochondrial Dynamics
  • Human Cell Biology

Background:

  • Mitochondria exhibit significant pleomorphism and dynamic behavior in human cells.
  • The mitochondrial mass can transition between a reticular network and numerous discrete ovoid structures.

Purpose of the Study:

  • To investigate the structural organization and dynamic behavior of mitochondria in human cells.
  • To propose a novel model for mitochondrial substructure based on observed dynamics.

Main Methods:

  • Observation of mitochondrial morphology and movement in cultured human cells.
  • Analysis of protein complex and nucleoid distribution within the mitochondrial mass.

Main Results:

  • Mitochondria are highly dynamic, undergoing constant thermal motion and 0.8-microm jumps linked to cytoskeletal elements.
  • Protein complexes and DNA nucleoids are distributed throughout the mitochondrial mass, becoming segregated during reticulum fragmentation.
  • This distribution supports the concept of discrete, functional units within mitochondria.

Conclusions:

  • The dynamic nature and internal organization of mitochondria suggest a repeating 'replicating module' as the fundamental unit of mitochondrial structure.
  • This model aids in understanding the distribution of essential components during mitochondrial fragmentation and fusion events.