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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

13.7K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Mitochondrial Membranes01:45

Mitochondrial Membranes

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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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Mitochondrial Membranes01:45

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Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
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Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

5.1K
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...
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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

3.9K
Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
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Related Experiment Video

Updated: Mar 20, 2026

Assessment of Mitochondrial Fission/Fusion Dynamics in Kidney Proximal Tubular Cells
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Assessment of Mitochondrial Fission/Fusion Dynamics in Kidney Proximal Tubular Cells

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Linking mitochondrial dynamics to mitochondrial protein quality control.

Suraiya Haroon1, Marc Vermulst1

  • 1Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA 19104, USA.

Current Opinion in Genetics & Development
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Mitochondrial fusion and fission dynamics are key to cellular health, influencing disease and aging. These processes are predicted to be closely linked with mitochondrial protein quality control mechanisms.

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Area of Science:

  • Mitochondrial Biology
  • Cellular Organelles
  • Human Disease Etiology

Background:

  • Recent decades have seen significant advances in understanding mitochondrial biology and its link to human diseases.
  • Discoveries include the role of mitochondrial mutations in cancer, mitophagy in Parkinson's disease, the mTOR pathway in aging, and the mitochondrial unfolded protein response in lifespan regulation.

Purpose of the Study:

  • To review the fundamental biology of mitochondrial fusion and fission.
  • To explain how these processes contribute to human health by addressing challenges inherent in complex organelles.
  • To propose a novel connection between mitochondrial dynamics and protein quality control.

Main Methods:

  • Review of existing literature on mitochondrial fusion and fission.
  • Analysis of the functional implications of mitochondrial dynamics.
  • Formulation of a hypothesis linking fusion/fission to protein quality control.

Main Results:

  • Mitochondrial fusion and fission are fundamental processes that shape the mitochondrial population and influence cellular function.
  • These dynamic processes are crucial for maintaining organelle health and function.
  • A novel prediction is made regarding the intimate link between mitochondrial fusion/fission and protein quality control.

Conclusions:

  • The balance of mitochondrial fusion and fission is critical for overall mitochondrial function and cellular health.
  • Understanding these dynamics provides insights into aging and various human diseases.
  • Mitochondrial dynamics are hypothesized to play a significant role in maintaining mitochondrial protein homeostasis.