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Related Concept Videos

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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Translocation of Proteins into the Mitochondria01:19

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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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Energy to Drive Translocation01:37

Energy to Drive Translocation

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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
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Signal Transduction: Overview01:26

Signal Transduction: Overview

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Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
Typically, signal transduction involves three...
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Intracellular Signaling Cascades01:24

Intracellular Signaling Cascades

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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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MAPK Signaling Cascades01:07

MAPK Signaling Cascades

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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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Related Experiment Video

Updated: Aug 23, 2025

Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells
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Analyses of Mitochondrial Calcium Influx in Isolated Mitochondria and Cultured Cells

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Mitochondrial signal transduction.

Martin Picard1, Orian S Shirihai2

  • 1Department of Psychiatry, Division of Behavioral Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA; Department of Neurology, H. Houston Merritt Center, Columbia Translational Neuroscience Initiative, Columbia University Irving Medical Center, New York, NY 10032, USA; New York State Psychiatric Institute, New York, NY 10032, USA.

Cell Metabolism
|November 2, 2022
PubMed
Summary
This summary is machine-generated.

Mitochondria are dynamic cellular processors, not just powerhouses. They sense, integrate, and signal information, playing a crucial role in organismal adaptation and human health.

Keywords:
amplificationcommunicationenergyevolutionhealthmembrane potentialmetabokinesmito-nuclear signalingmitochondrial networksmitokinesmitotypesreceptorssignal transductionsteroid hormonesstress responsestissue-specific

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Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Systems Biology

Background:

  • Mitochondria have traditionally been viewed as simple "powerhouses" of the cell.
  • This outdated analogy overlooks their complex roles in cellular processes.
  • A new framework is needed to understand mitochondria's multifaceted functions.

Purpose of the Study:

  • To propose a new paradigm for understanding mitochondria as cellular information processors.
  • To introduce the concept of the mitochondrial information processing system (MIPS).
  • To highlight the role of mitochondrial signal transduction in physiology and health.

Main Methods:

  • Conceptual framework development based on existing literature.
  • Analysis of mitochondrial functions including sensing, integration, and signaling.
  • Emphasis on dynamic network interactions and information transduction.

Main Results:

  • Mitochondria actively transduce biological information through a three-step process: sensing/responding, integrating, and signaling.
  • Mitochondria remodel morphologically and functionally to respond to internal and external cues.
  • Mitochondrial output signals regulate other organelles and systemic physiology, enhancing adaptation.

Conclusions:

  • Mitochondria function as central processors within the cell's information processing system (MIPS).
  • Understanding mitochondria through signal transduction reveals their critical role in communication and adaptation.
  • This new perspective offers insights into mitochondrial roles in inter-organ processes and human health.