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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...

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...

Rab Cascades

Rab Cascades

Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.

Clathrin Coated Vesicles

Clathrin Coated Vesicles

Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...

SNAREs and Membrane Fusion

SNAREs and Membrane Fusion

Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...

Assembly of Signaling Complexes

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...

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Related Experiment Video

Updated: Dec 20, 2025

Telomerase Activity in the Various Regions of Mouse Brain: Non-Radioactive Telomerase Repeat Amplification Protocol TRAP Assay

Telomerase Activity in the Various Regions of Mouse Brain: Non-Radioactive Telomerase Repeat Amplification Protocol TRAP Assay

Published on: September 2, 2014

Understanding the mammalian TRAP complex function(s).

Antonietta Russo¹

¹Medical Biochemistry and Molecular Biology, UKS, University of Saarland, Homburg, Germany.

|May 27, 2020

Summary

This summary is machine-generated.

The translocon-associated protein (TRAP) complex aids protein translocation into the endoplasmic reticulum. Further research is needed to clarify its specific roles in protein transport and cellular stress responses.

Keywords:

calcium-binding domain endoplasmic reticulum protein translocation endoplasmic-reticulum-associated protein degradation glycosylation translocon-associated protein complex unfolded protein response

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TRAP-rc, Translating Ribosome Affinity Purification from Rare Cell Populations of Drosophila Embryos

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Published on: September 10, 2015

Area of Science:

Cell Biology
Molecular Biology
Protein Trafficking

Background:

Eukaryotic cells synthesize proteins destined for the endoplasmic reticulum (ER), Golgi apparatus, or membranes.
Co-translational translocation into the ER occurs via the Sec61 channel, often with accessory factors like the translocon-associated protein (TRAP) complex.
Recent advances in cryo-electron microscopy have revealed the structure of the translocation machinery.

Purpose of the Study:

To elucidate the function of the translocon-associated protein (TRAP) complex during co-translational translocation.
To explore the potential roles of the TRAP complex in cellular processes such as the unfolded protein response, ER-associated protein degradation, and congenital disorders of glycosylation.

Main Methods:

Review of current literature on protein translocation machinery.
Analysis of structural data from cryo-electron microscopy and tomography.
Discussion of potential TRAP complex functions based on existing research.

Main Results:

The precise function of the TRAP complex during co-translational translocation remains incompletely understood.
Structural studies have provided insights into the translocation machinery but not definitive functional roles for all components.
TRAP complex involvement is hypothesized in unfolded protein response, ER-associated protein degradation, and specific congenital disorders of glycosylation.

Conclusions:

The TRAP complex is a key component of the ER translocation machinery whose functions require further investigation.
Understanding TRAP complex roles is crucial for comprehending protein trafficking and associated cellular pathologies.
Future research should focus on experimentally validating the proposed functions of the TRAP complex.