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Protein Translocation Machinery on the ER Membrane

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.

Insertion of Single-pass Transmembrane Proteins in the RER

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...

Cotranslational Protein Translocation

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...

Post-translational Translocation of Proteins to the RER

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...

Bacterial Translocation and Protein Secretion

Bacterial Translocation and Protein Secretion

Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...

Insertion of Multi-pass Transmembrane Proteins in the RER

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...

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Förster Resonance Energy Transfer Mapping: A New Methodology to Elucidate Global Structural Features

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Published on: March 16, 2022

Two-step insertion at the SecY translocon.

Soo Jung Kim¹, William R Skach

¹Department of Biochemistry and Molecular Biology, Oregon Health and Science University, Portland, Oregon, USA.

Nature Structural & Molecular Biology

|October 6, 2012

Summary

This summary is machine-generated.

The SecY/Sec61 translocon uses mechanical force to insert proteins into cell membranes. This pulling force acts at two key steps during protein biogenesis, ensuring proper membrane protein insertion.

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Published on: January 26, 2011

Area of Science:

Molecular biology
Cellular biogenesis
Membrane protein insertion

Background:

SecY and Sec61 translocons are essential protein complexes responsible for inserting transmembrane segments into the lipid bilayer.
Understanding the mechanism of membrane protein biogenesis is crucial for cell biology and disease research.

Purpose of the Study:

To investigate the mechanical forces exerted by the SecY/Sec61 translocon during membrane protein insertion.
To determine if the translocon's force is applied at specific stages of the nascent chain's journey.

Main Methods:

Utilized a SecM-based molecular force sensor.
Applied single-molecule force spectroscopy techniques to monitor translocon activity.

Main Results:

Demonstrated that the translocon exerts a significant pulling force on the nascent polypeptide chain.
Identified two distinct stages during membrane protein insertion where this mechanical force is actively applied.

Conclusions:

The SecY/Sec61 translocon employs mechanical force, not just passive threading, for membrane protein insertion.
This mechanical action is critical for the orderly and efficient biogenesis of membrane proteins.