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Related Concept Videos

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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The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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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...
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Structure of Porins01:21

Structure of Porins

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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...
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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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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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Updated: Apr 14, 2026

Assessment of Open Probability of the Mitochondrial Permeability Transition Pore in the Setting of Coenzyme Q Excess
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Assessment of Open Probability of the Mitochondrial Permeability Transition Pore in the Setting of Coenzyme Q Excess

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Life after MOMP.

Vivian Gama1, Mohanish Deshmukh1

  • 1Neuroscience Center, University of North Carolina, Chapel Hill, NC 27599, USA; Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC 27599, USA.

Molecular Cell
|April 18, 2015
PubMed
Summary
This summary is machine-generated.

Low caspase activity from limited mitochondrial outer membrane permeabilization (MOMP) fuels genomic instability, driving cancer initiation. This unexpected link connects apoptosis effectors to early tumor development.

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Related Experiment Videos

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Assessment of Open Probability of the Mitochondrial Permeability Transition Pore in the Setting of Coenzyme Q Excess
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A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics
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Area of Science:

  • Cellular biology
  • Cancer research
  • Apoptosis signaling

Background:

  • Caspases are key effectors of apoptosis.
  • Mitochondrial outer membrane permeabilization (MOMP) is a critical step in apoptosis.
  • The role of low-level caspase activity in cancer is not well understood.

Purpose of the Study:

  • To investigate the role of limited caspase activity in tumorigenesis.
  • To explore the connection between MOMP and genomic instability.
  • To establish a novel link between apoptosis and cancer initiation.

Main Methods:

  • Analysis of caspase activity levels.
  • Assessment of mitochondrial outer membrane permeabilization.
  • Evaluation of genomic instability markers.
  • Tumorigenesis studies.

Main Results:

  • Limited caspase activity, triggered by partial MOMP, was found to promote genomic instability.
  • This genomic instability was directly linked to the initiation of tumors.
  • An unexpected connection was revealed between apoptosis effectors and cancer development.

Conclusions:

  • Low levels of caspase activity can paradoxically promote cancer initiation.
  • MOMP, even at limited levels, has implications beyond cell death.
  • The study provides a novel perspective on the interplay between apoptosis and cancer.