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Related Concept Videos

Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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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

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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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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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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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Mitochondria01:37

Mitochondria

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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,...
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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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Updated: Dec 24, 2025

Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs

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Mitochondrial biogenesis: An update.

Lucia-Doina Popov1

  • 1"Nicolae Simionescu" Institute of Cellular Biology and Pathology of the Romanian Academy, Bucharest, Romania.

Journal of Cellular and Molecular Medicine
|April 13, 2020
PubMed
Summary
This summary is machine-generated.

Cells generate new mitochondria through mitochondrial biogenesis to meet energy demands. This review explores the mechanisms, signaling pathways, and therapeutic potential of mitochondrial biogenesis in health and disease.

Keywords:
PGC-1αageingcancermetabolic diseasesmtDNAneurodegenerationnuclear respiratory factorstranscription factor A

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Mitochondrial biogenesis is crucial for cellular energy production.
  • Dysfunctional mitochondrial biogenesis is linked to various pathologies.
  • Understanding intracellular mechanisms driving mitochondrial biogenesis is incomplete.

Purpose of the Study:

  • To provide an overview of intracellular mechanisms in mitochondrial biogenesis.
  • To examine the role of mitochondrial biogenesis in maintaining cellular homeostasis.
  • To discuss signaling pathways and therapeutic applications of mitochondrial biogenesis.

Main Methods:

  • Literature review and synthesis of current research on mitochondrial biogenesis.
  • Analysis of key proteins and genes involved in the process.
  • Exploration of signaling pathways regulating mitochondrial biogenesis.

Main Results:

  • Mitochondrial biogenesis maintains mitochondrial mass and function.
  • Specific signaling pathways control the induction, promotion, and inhibition of mitochondrial biogenesis.
  • Therapeutic strategies target mitochondrial biogenesis for regenerative medicine.

Conclusions:

  • Mitochondrial biogenesis is a complex process with significant implications for health and disease.
  • Further research into mitochondrial medicine and biogenesis mechanisms is warranted.
  • Targeting mitochondrial biogenesis offers potential therapeutic avenues for age-related and metabolic disorders.