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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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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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Porin Insertion in the Outer Mitochondrial Membrane01:12

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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.
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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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Protein Transport into the Inner Mitochondrial Membrane01:34

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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
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Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
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Assessment of Submitochondrial Protein Localization in Budding Yeast Saccharomyces cerevisiae
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Mitochondrial localization of SESN2.

Irina E Kovaleva1, Artem V Tokarchuk1, Andrei O Zheltukhin2,3

  • 1Belozersky Institute of Physico-Chemical Biology, Moscow, Russia.

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Summary

Sestrin 2 (SESN2) protein localizes to mitochondria, regulating mitochondrial function independently of its known role in inhibiting mTORC1 signaling. This suggests novel functions for SESN2 beyond metabolic control.

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Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Stress Response

Background:

  • Sestrin 2 (SESN2) is a stress-inducible protein involved in cellular responses to metabolic stress and reactive oxygen species (ROS).
  • SESN2 is primarily known for inhibiting the mechanistic target of rapamycin complex 1 (mTORC1) pathway, impacting cell growth and autophagy.
  • The full spectrum of SESN2 functions, particularly its role beyond mTORC1 inhibition, remains incompletely understood.

Purpose of the Study:

  • To investigate the subcellular localization of SESN2.
  • To explore potential novel functions of SESN2 in regulating mitochondrial physiology.
  • To determine if SESN2 directly impacts mitochondrial function through mTORC1-independent mechanisms.

Main Methods:

  • Immunofluorescence microscopy to determine SESN2 localization.
  • Biochemical assays to assess mitochondrial function.
  • Studies involving manipulation of SESN2 expression and activity.

Main Results:

  • Demonstrated that SESN2 is localized to mitochondria.
  • Provided evidence that SESN2 directly influences mitochondrial functions.
  • Showed that these mitochondrial effects can occur independently of mTORC1 signaling.

Conclusions:

  • SESN2 possesses mitochondrial localization, suggesting a direct role in organelle regulation.
  • SESN2 may exert novel functions in controlling mitochondrial health and cellular viability.
  • These findings expand the known functional repertoire of SESN2, highlighting its importance in mitochondrial homeostasis.