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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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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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Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

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Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
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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.
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Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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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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Related Experiment Videos

Interplay between mitochondria and cellular calcium signalling.

Jake Jacobson1, Michael R Duchen

  • 1Department of Physiology, University College London, London, UK. j.jacobson@ucl.ac.uk

Molecular and Cellular Biochemistry
|February 24, 2004
PubMed
Summary
This summary is machine-generated.

Mitochondria play key roles in cell signaling, apoptosis, and energy production. Their calcium handling influences cell function and oxidative stress responses.

Related Experiment Videos

Area of Science:

  • Cell Biology
  • Mitochondrial Function

Background:

  • Mitochondria are central to cell signaling, apoptosis, and ATP production.
  • Calcium transients are ubiquitous in eukaryotic cells and involved in numerous signaling cascades.

Purpose of the Study:

  • To review current knowledge on mitochondrial calcium uptake and release mechanisms.
  • To discuss the consequences of mitochondrial calcium handling for cell function, especially concerning oxidative stress.

Main Methods:

  • Literature review of mitochondrial calcium handling mechanisms.
  • Analysis of the interplay between mitochondrial calcium buffering and metabolic responses.

Main Results:

  • Mitochondria act as local calcium buffers, shaping cytosolic calcium signals.
  • Mitochondria respond to calcium uptake by upregulating the tricarboxylic acid cycle, impacting cellular metabolism.

Conclusions:

  • Mitochondrial calcium handling is critical for cellular signaling and metabolic regulation.
  • Understanding mitochondrial calcium dynamics is essential for comprehending cell function and oxidative stress.