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Related Concept Videos

Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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Regulated mRNA Transport02:22

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Cotranslational Protein Translocation01:20

Cotranslational Protein Translocation

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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.
Sec61 channel partners for cotranslational translocation
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Post-translational Translocation of Proteins to the RER01:27

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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
Hsp40 and Hsp70 chaperone molecules bind the translated proteins in the cytosol to prevent their folding. The chaperone binding helps to keep the signal...
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Tail-anchoring of Proteins in the ER Membrane01:45

Tail-anchoring of Proteins in the ER Membrane

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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...
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Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
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Updated: Jul 17, 2025

Visualization of Endoplasmic Reticulum Localized mRNAs in Mammalian Cells
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Examining SRP pathway function in mRNA localization to the endoplasmic reticulum.

Jessica R Child1, Alex C Hofler2, Qiang Chen1

  • 1Department of Cell Biology, Duke University School of Medicine, Durham, North Carolina 27710, USA.

RNA (New York, N.Y.)
|August 29, 2023
PubMed
Summary

The signal recognition particle (SRP) pathway is not essential for mRNA localization to the endoplasmic reticulum (ER). This study reveals that ER mRNA localization can occur independently of the SRP pathway, challenging existing models.

Keywords:
RNA localizationSRP receptorendoplasmic reticulummRNAribosome

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Method for the Isolation and Identification of mRNAs, microRNAs and Protein Components of Ribonucleoprotein Complexes from Cell Extracts using RIP-Chip
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Method for the Isolation and Identification of mRNAs, microRNAs and Protein Components of Ribonucleoprotein Complexes from Cell Extracts using RIP-Chip
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The signal recognition particle (SRP) pathway is crucial for protein translocation into the endoplasmic reticulum (ER).
  • Its role in directing messenger RNA (mRNA) to the ER for co-translational translocation is not fully understood.
  • Current models propose SRP-dependent ribosome-mRNA targeting to the ER via the SRP receptor (SR).

Purpose of the Study:

  • To investigate the function of the SRP pathway in mRNA localization to the ER.
  • To determine the impact of SRP receptor (SR) knockout on steady-state and dynamic mRNA localization.
  • To elucidate the mechanisms governing ER mRNA targeting.

Main Methods:

  • Generation of SR knockout (SR KO) mammalian cell lines using CRISPR/Cas9 and siRNA.
  • Analysis of steady-state mRNA composition and ER localization via cell fractionation and deep sequencing.
  • Assessment of mRNA trafficking dynamics using 4-thiouridine (4SU) pulse-labeling followed by 4SU-seq and cell fractionation.

Main Results:

  • SR KO cells were successfully generated, although SRPRB knockout destabilized SRA.
  • Steady-state mRNA distribution between the cytosol and ER remained largely unchanged in SR KO cells.
  • Newly exported mRNAs showed high ER enrichment independently of SR, with the ER acting as a default site under translation inhibition.

Conclusions:

  • mRNA localization to the ER can be uncoupled from the canonical SRP pathway.
  • The findings challenge established models of SRP-mediated mRNA targeting to the ER.
  • Further research is needed to understand the alternative mechanisms driving ER mRNA localization.