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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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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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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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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.
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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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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 Video

Updated: Aug 12, 2025

Mitochondrial Preparation from Microglia for Glycan Analysis
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Neuronal activity-driven O-GlcNAcylation promotes mitochondrial plasticity.

Seungyoon B Yu, Richard G Sanchez, Zachary D Papich

    Biorxiv : the Preprint Server for Biology
    |January 30, 2023
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    Summary

    The enzyme O-GlcNAc transferase regulates mitochondrial energy production in neurons. This metabolic sensor links fuel availability to neuronal activity, ensuring energy homeostasis.

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    Area of Science:

    • Neuroscience
    • Cellular Metabolism
    • Biochemistry

    Background:

    • Neuronal activity demands significant energy, primarily met through ATP synthesis.
    • The mechanisms coupling ATP synthesis to fuel availability in neurons remain poorly understood.
    • Understanding this link is crucial for comprehending neuronal energy homeostasis.

    Approach:

    • Investigated the role of O-GlcNAc transferase (OGT) in regulating neuronal bioenergetics.
    • Examined O-GlcNAcylation levels in mitochondria during neuronal activity.
    • Mapped the mitochondrial O-GlcNAcome to identify key regulatory proteins.

    Key Points:

    • Neuronal activity increases O-GlcNAcylation, particularly within mitochondria.
    • Activity-driven fuel consumption promotes mitochondrial O-GlcNAcylation, supporting energy demands.
    • Disrupting O-GlcNAcylation dynamics impairs neurons' ability to meet metabolic demands.

    Conclusions:

    • O-GlcNAcylation acts as a fuel-dependent feedforward mechanism in neurons.
    • This process optimizes mitochondrial function based on neuronal activity levels.
    • O-GlcNAcylation is vital for coupling neuronal metabolism to mitochondrial bioenergetics and maintaining energy balance.