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Related Concept Videos

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...
Tail-anchoring of Proteins in the ER Membrane01:45

Tail-anchoring of Proteins in the ER Membrane

Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
Insertion of Multi-pass Transmembrane Proteins in the RER01:29

Insertion of Multi-pass Transmembrane Proteins in the RER

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.
The multipass transmembrane proteins are the type IV integral membrane proteins with multiple topogenic sequences determining their spatial arrangement in the ER membrane. Nearly all multipass proteins lack a cleavable signal sequence and use...
GPI Anchoring of Proteins in the ER Membrane01:29

GPI Anchoring of Proteins in the ER Membrane

GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
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.
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...

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Reconstitution of Msp1 Extraction Activity with Fully Purified Components
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Published on: August 10, 2021

Membrane protein integration into the endoplasmic reticulum.

Luis Martínez-Gil1, Ana Saurí, Marc A Marti-Renom

  • 1Departament de Bioquímica i Biologia Molecular, Universitat de València, Burjassot, Spain.

The FEBS Journal
|May 20, 2011
PubMed
Summary
This summary is machine-generated.

This minireview details how helical membrane proteins integrate into the endoplasmic reticulum membrane. It highlights the role of translocons and other factors in ensuring successful protein biogenesis for multispanning membrane proteins.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Integral membrane proteins are crucial for cellular functions.
  • Their synthesis and assembly occur primarily in the endoplasmic reticulum.
  • Understanding this process is key to deciphering cellular mechanisms.

Purpose of the Study:

  • To summarize current knowledge on helical membrane protein integration.
  • To elucidate the function of translocons in protein biogenesis.
  • To identify factors influencing multispanning membrane protein assembly.

Main Methods:

  • Literature review of existing research on membrane protein integration.
  • Analysis of the roles of translocons, ribosomes, and chaperones.
  • Focus on helical membrane protein biogenesis in the endoplasmic reticulum.

Main Results:

  • Membrane protein integration involves sequential events at translocon complexes.
  • Translocons, ribosomes, and chaperones work together for successful protein insertion.
  • Specific protein characteristics impact the biogenesis of multispanning proteins.

Conclusions:

  • The endoplasmic reticulum is the primary site for integral membrane protein biogenesis.
  • Translocons are central to the insertion and assembly of helical membrane proteins.
  • Further research into protein characteristics is needed to fully understand multispanning protein biogenesis.