Sec61 Translocon
Sec61 Translocon - Related Videos
07:01
Affinity Purification of Chloroplast Translocon Protein Complexes Using the TAP Tag
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Cited by 1 •
2018
We here present a proven and tested protocol for the purification of chloroplast protein import complexes (TOC-TIC complex) using the TAP-tag. The one-step affinity-isolation protocol can potentially be applied to any protein and be used to identify new interaction partners by mass spectrometry.
07:55
Ground State Depletion Super-resolution Imaging in Mammalian Cells
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Cited by 16 •
2017
This article outlines a protocol for the detection of one or more plasma and/or intracellular membrane proteins using Ground State Depletion (GSD) super-resolution microscopy in mammalian cells. Here, we discuss the benefits and considerations of using such approaches for the visualization and quantification of cellular proteins.
FAQs
The signal sequence on an emerging polypeptide helps target its translating ribosome to the endoplasmic reticulum membrane, positioning the growing chain at Sec61. This coupling allows translocation to begin while synthesis continues, linking protein production with entry into the secretory pathway rather than requiring the completed protein to cross the membrane afterward.
Channel opening creates a route for the newly synthesized polypeptide to cross the endoplasmic reticulum membrane. Depending on the protein’s targeting information, the chain can enter the membrane-spanning channel and continue across the membrane, or reach the lipid bilayer through Sec61’s lateral gate for membrane insertion. These alternatives support different protein destinations.
The lateral gate provides an exit from the translocation channel into the surrounding lipid bilayer. This feature allows suitable segments of an emerging polypeptide to become embedded in the membrane instead of passing entirely across it. Its activity therefore connects translation at the ribosome with the generation of integral membrane proteins.
By coordinating translocation or membrane insertion with synthesis, Sec61 helps newly produced proteins enter the route where they can fold, mature, and reach correct cellular destinations. Studying this early step therefore informs research on protein biogenesis as a whole, because errors at entry can affect subsequent processing and trafficking.
Sec61 provides a framework for examining how secreted and membrane proteins begin their movement through the cell. Investigations can focus on signal-sequence targeting, channel opening, membrane insertion, and the relationship between entry, folding, maturation, and delivery. Together, these processes clarify how cells organize protein trafficking from the moment synthesis begins.
Protein-trafficking defects can be investigated by examining the steps that connect translation with endoplasmic reticulum entry, membrane insertion, folding, maturation, and destination. Because Sec61 coordinates the initial translocation process, it offers a mechanistic framework for relating failures in protein biogenesis to abnormal trafficking outcomes and for identifying where cellular protein handling may be disrupted.