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Related Concept Videos

Protein Translocation Machinery on the ER Membrane01:28

Protein Translocation Machinery on the ER Membrane

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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
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...
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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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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
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Elucidating Protein Translocon Dynamics with Single-Molecule Precision.

Madeline M Davis1, Rajan Lamichhane1, Barry D Bruce2

  • 1Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee at Knoxville, Knoxville, TN 37996, USA.

Trends in Cell Biology
|April 18, 2021
PubMed
Summary

New microscopy techniques reveal how translocons, protein complexes for membrane transport, function. These advances in cryo-electron microscopy (cryo-EM) and single-molecule fluorescence microscopy are key to understanding protein translocation dynamics.

Keywords:
SecYEG/61cryogenic electron microscopyeukaryotic protein importprokaryotic protein secretionsingle-molecule fluorescence microscopy

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Translocons are essential protein machinery for membrane protein targeting and transport.
  • Traditional methods provided foundational knowledge but limited insights into translocation mechanisms.
  • A detailed understanding of translocon recognition and protein translocation processes remained elusive.

Purpose of the Study:

  • To introduce and evaluate advanced microscopy techniques for studying translocon function.
  • To highlight the impact of cryo-electron microscopy (cryo-EM) and single-molecule fluorescence microscopy on translocon research.
  • To elucidate the structure, function, and dynamics of translocon systems.

Main Methods:

  • Cryogenic electron microscopy (cryo-EM) single-particle analysis.
  • Single-molecule fluorescence microscopy.
  • Integration of genetic and biochemical approaches.

Main Results:

  • Emerging details on how translocons recognize and facilitate protein translocation.
  • High-resolution structural insights into translocon complexes.
  • Dynamic mechanisms of protein transport across membranes elucidated.

Conclusions:

  • Cryo-EM and single-molecule fluorescence microscopy are revolutionizing translocon research.
  • These techniques provide unprecedented views into the functional mechanisms of protein translocation.
  • A deeper understanding of translocon dynamics and function is now achievable.