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Related Concept Videos

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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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 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.
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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.
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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.
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Related Experiment Video

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Author Spotlight: Decoding Mitochondrial Aging
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Neuronal activity-driven O-GlcNAcylation promotes mitochondrial plasticity.

Seungyoon B Yu1, Haoming Wang1, Richard G Sanchez1

  • 1Neurobiology Department, School of Biological Sciences, University of California San Diego, La Jolla, CA 92093, USA.

Developmental Cell
|June 6, 2024
PubMed
Summary

Neurons use O-linked N-acetyl glucosamine (O-GlcNAc) transferase to link fuel availability to energy production, optimizing mitochondrial function during high activity. This metabolic sensor ensures neurons meet energy demands.

Keywords:
ATP synthesisO-GlcNAc transferaseO-GlcNAcylationglycosylationmitochondrianeuronal metabolismsynaptic activity

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Area of Science:

  • Neuroscience
  • Cellular Metabolism
  • Biochemistry

Background:

  • Neuronal activity demands significant energy, primarily met by ATP synthesis.
  • The mechanisms coupling ATP production to fuel availability in neurons are not fully understood.

Purpose of the Study:

  • To investigate the role of O-linked N-acetyl glucosamine (O-GlcNAc) transferase in regulating neuronal energy metabolism.
  • To elucidate how O-GlcNAc transferase links neuronal activity to mitochondrial bioenergetics.

Main Methods:

  • Studied O-GlcNAcylation in hippocampal and cortical neurons.
  • Analyzed mitochondrial O-GlcNAcome using proteomic analysis.
  • Assessed neuronal metabolic demand under conditions with and without O-GlcNAc dynamics.

Main Results:

  • Neuronal activity increases O-GlcNAcylation within mitochondria.
  • Activity-driven glucose consumption promotes mitochondrial O-GlcNAcylation, aiding energy compensation.
  • Impaired O-GlcNAc dynamics prevent neurons from meeting metabolic demands.

Conclusions:

  • O-GlcNAc transferase acts as a fuel-dependent sensor, optimizing mitochondrial performance based on neuronal activity.
  • This mechanism couples neuronal metabolism to mitochondrial bioenergetics, crucial for energy homeostasis.