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Related Concept Videos

Post-translational Translocation of Proteins to the RER01:27

Post-translational Translocation of Proteins to the RER

A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
Targeting proteins to the ER
Hsp40 and Hsp70 chaperone molecules bind the translated proteins in the cytosol to prevent their folding. The chaperone binding helps to keep the signal...
Cotranslational Protein Translocation01:20

Cotranslational Protein Translocation

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.
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...
Insertion of Single-pass Transmembrane Proteins in the RER01:26

Insertion of Single-pass Transmembrane Proteins in the RER

Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...
Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
Protein Translocation Machinery on the ER Membrane01:28

Protein Translocation Machinery on the ER Membrane

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
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the translocon complex.
Export of Misfolded Proteins out of the ER01:32

Export of Misfolded Proteins out of the ER

After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...

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Visualization of Endoplasmic Reticulum Localized mRNAs in Mammalian Cells
10:24

Visualization of Endoplasmic Reticulum Localized mRNAs in Mammalian Cells

Published on: December 17, 2012

Post-translational translocation into the endoplasmic reticulum.

Nicholas Johnson1, Katie Powis, Stephen High

  • 1The University of Manchester, Manchester, UK.

Biochimica Et Biophysica Acta
|December 26, 2012
PubMed
Summary

This review explores how proteins are targeted to the endoplasmic reticulum (ER) membrane after their synthesis is complete. Understanding these post-translational mechanisms is crucial for maintaining cellular health and preventing disease.

Keywords:
Asna 1Get3Short secretory proteinTRC40Tail-anchored protein

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Published on: February 21, 2019

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Proteins entering the endomembrane system are typically co-translationally inserted into the ER membrane.
  • A growing body of evidence indicates that many proteins are targeted to the ER membrane post-translationally.
  • Defective post-translational targeting can lead to proteostasis disruption, cellular dysfunction, and disease.

Purpose of the Study:

  • To review the mechanisms of post-translational targeting and insertion of proteins into the ER membrane.
  • To highlight the importance of efficient protein capture and delivery for cellular function.
  • To discuss the implications of impaired post-translational protein translocation.

Main Methods:

  • Literature review of studies on protein targeting to the ER.
  • Analysis of mechanisms for post-translational protein insertion and translocation.
  • Discussion of cellular consequences of targeting failures.

Main Results:

  • Multiple pathways exist for post-translational targeting of proteins to the ER.
  • Efficient capture and delivery are essential for preventing proteostasis imbalance.
  • Dysregulation of these pathways contributes to various diseases.

Conclusions:

  • Post-translational protein targeting to the ER is a critical process.
  • Further research into these mechanisms can reveal new therapeutic strategies.
  • Understanding ER protein targeting is key to comprehending cellular homeostasis.