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Related Concept Videos

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,...
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,...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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,...
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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...
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,...

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Studying Mitochondrial Structure and Function in Drosophila Ovaries
09:53

Studying Mitochondrial Structure and Function in Drosophila Ovaries

Published on: January 4, 2017

Multiple functions of mitochondria-shaping proteins.

Luca Scorrano1

  • 1Dulbecco-Telethon Institute, Venetian Institute of Molecular Medicine, Via Orus 2, 35129 Padova, Italy.

Novartis Foundation Symposium
|December 14, 2007
PubMed
Summary

Mitochondria shape is regulated by proteins like Optic Atrophy 1 (Opa1). Opa1 controls mitochondrial fusion and apoptosis independently, with its disruption leading to cell death.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Mitochondria are dynamic organelles with shape and organization influenced by specific proteins.
  • Key proteins include Mitofusin (Mfn) 1 and 2, Optic Atrophy 1 (Opa1), dynamin-related protein 1 (Drp1), and Fis1.
  • These proteins impact mitochondrial morphology, function, and cellular signaling pathways like apoptosis.

Purpose of the Study:

  • To investigate the function and regulation of mitochondria-shaping proteins using a genetic approach.
  • To elucidate the role of Optic Atrophy 1 (Opa1) in mitochondrial fusion and apoptosis.
  • To understand the mechanism by which Opa1 regulates the mitochondrial cristae remodeling pathway during apoptosis.

Main Methods:

  • Genetic analysis of mitochondria-shaping proteins.

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Last Updated: Jul 9, 2026

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  • Investigating the interaction between Opa1 and Mitofusin 1 (Mfn1) in mitochondrial fusion.
  • Studying the role of the inner membrane rhomboid protease Parl in Opa1 processing and apoptosis.

    • Main Results:

    • Opa1 plays a role in regulating mitochondrial fusion, in cooperation with Mfn1.
    • Opa1 independently regulates the cristae remodeling pathway of apoptosis.
    • Disruption of Opa1 oligomers by Parl early in apoptosis leads to cristae remodeling and cytochrome c redistribution.
    • Parl-deficient mice exhibit excessive apoptosis, and their cells are more susceptible to apoptotic stimuli.

    Conclusions:

    • Opa1 is a key regulator of both mitochondrial fusion and apoptosis.
    • The Parl-mediated processing of Opa1 is critical for controlling apoptosis.
    • Dysregulation of this pathway, as seen in Parl deficiency, has significant implications for cellular viability and tissue homeostasis.