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Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

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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Ribosomal RNA Synthesis

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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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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Ribosomes01:27

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Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
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Ribosomes01:27

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Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.Ribosome Structure and AssemblyRibosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within the...
Ribosomes01:27

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Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
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Updated: Jun 14, 2026

Single Molecule Fluorescence Energy Transfer Study of Ribosome Protein Synthesis
08:07

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Published on: July 6, 2021

Chaperoning ribosome assembly.

Katrin Karbstein1

  • 1Department of Chemistry and 2 Department of Biological Chemistry, University of Michigan, Ann Arbor, MI 48109, USA. kkarbst@umich.edu

The Journal of Cell Biology
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

Molecular chaperones, including ribosome-associated complex (RAC) and nascent chain-associated complex (NAC), not only aid protein folding but also play a crucial role in ribosome assembly.

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Area of Science:

  • Molecular biology
  • Cellular biology
  • Protein folding
  • Ribosome biogenesis

Background:

  • Chaperones are essential proteins that assist in protein folding and prevent aggregation within cellular compartments.
  • Many chaperones associate with ribosomes, interacting with nascent polypeptide chains as they emerge from the ribosome.
  • This interaction is primarily understood to facilitate proper protein folding and prevent aggregation.

Discussion:

  • Recent studies by Koplin et al. and Albanèse et al. reveal a novel function for specific chaperones.
  • These chaperones, including ribosome-associated complex (RAC), nascent chain-associated complex (NAC), and Jjj1, are implicated in ribosome assembly.
  • This finding expands the known roles of these molecular machines beyond protein folding assistance.

Key Insights:

  • Ribosome-associated complex (RAC), nascent chain-associated complex (NAC), and Jjj1 contribute to the structural integrity and formation of ribosomes.
  • The dual role of these chaperones in both protein folding and ribosome biogenesis highlights their integral importance in cellular function.
  • This suggests a coordinated mechanism where chaperones manage both the synthesis and the machinery of protein production.

Outlook:

  • Further investigation is needed to elucidate the precise mechanisms by which these chaperones participate in ribosome assembly.
  • Understanding this process could reveal new therapeutic targets for diseases associated with protein misfolding and ribosome dysfunction.
  • The findings open new avenues for research into the complex interplay between protein homeostasis and organelle biogenesis.