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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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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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Protein Translocation Machinery on the ER Membrane01:28

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The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
Sec61 protein conducting channel
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Cotranslational Protein Translocation01:20

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Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
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The rough ER membrane synthesizes, assembles, and embeds transmembrane proteins in diverse topologies. These proteins function as transporters or channels and can remain in the ER membrane or are sent to the Golgi complex, lysosome, and cell membrane.
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Mitochondrial Protein Sorting01:39

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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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Transmembrane dislocases: a second chance for protein targeting.

Verena Dederer1, Marius K Lemberg2

  • 1Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany; Current address: Institute for Pharmaceutical Biology and Buchmann Institute for Molecular Life Science, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany.

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Transmembrane dislocases identify and extract mislocalized membrane proteins from cellular organelles, aiding protein homeostasis. This process prevents degradation and allows for correct protein targeting, crucial for cell viability.

Keywords:
AAA-ATPase Msp1/ATAD1/ThoraseER-associated degradationP5-type ATPase Spf1/ATP13A1mitochondrial protein quality controlprotein homeostasisprotein quality control

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Area of Science:

  • Cellular Biology
  • Molecular Mechanisms
  • Protein Homeostasis

Background:

  • Accurate protein distribution is vital for cell survival.
  • Protein quality control systems and degradation pathways maintain cellular balance.
  • Misfolded or mislocalized proteins pose a threat to cellular function.

Purpose of the Study:

  • To introduce the concept of transmembrane dislocases.
  • To explain their role in managing mislocalized membrane proteins.
  • To highlight their presence in the outer mitochondrial and endoplasmic reticulum membranes.

Main Methods:

  • Review of existing literature on protein targeting and quality control.
  • Analysis of proposed mechanisms for transmembrane dislocase function.
  • Identification of key features of transmembrane dislocase client recognition.

Main Results:

  • Transmembrane dislocases recognize and remove mislocalized membrane proteins.
  • This action occurs at the outer mitochondrial membrane and endoplasmic reticulum.
  • It facilitates re-targeting and prevents unnecessary protein degradation.

Conclusions:

  • Transmembrane dislocases are critical components of protein quality control.
  • They ensure protein homeostasis by managing mislocalized membrane proteins.
  • Further research is needed to fully understand their mechanisms and regulation.