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Ribosomes

Ribosomes

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 Assembly
Ribosomes 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...

Ribosomes

Ribosomes

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...

Ribosomes

Ribosomes

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 Assembly
Ribosomes 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...

Ribosomes

Ribosomes

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...

The Endoplasmic Reticulum

The Endoplasmic Reticulum

The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...

The Endoplasmic Reticulum

The Endoplasmic Reticulum

The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...

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Related Experiment Video

Updated: Jun 24, 2026

Single Molecule Fluorescence Energy Transfer Study of Ribosome Protein Synthesis

Single Molecule Fluorescence Energy Transfer Study of Ribosome Protein Synthesis

Published on: July 6, 2021

Endoplasmic Reticulum Structure as a Fundamental Physical Constraint on Ribosome Density.

Benjamin Tang¹

¹Department of Chemistry, 290 Jane Stanford Way, S385, Stanford University, Stanford, CA 94305-4401, USA.

Biophysical Journal

|June 23, 2026

Summary

This summary is machine-generated.

The endoplasmic reticulum’s (ER) geometry, whether flat sheets or tubules, influences ribosome capture efficiency. This model explains differences in ribosome density between rough and smooth ER, impacting protein expression.

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Area of Science:

Cell Biology
Biophysics
Computational Biology

Background:

Endoplasmic reticulum (ER) structure and ribosome density are key to protein synthesis.
Previous research focused on biological factors, not geometric influences on ribosome distribution.
The relationship between ER geometry and ribosome density remains underexplored.

Purpose of the Study:

To model how ER geometry constrains ribosome capture efficiency.
To explain observed differences in ribosome density between rough and smooth ER.
To predict how cells utilize different ER structures for protein expression.

Main Methods:

Developed a diffusion-limited model for ribosome capture on ER.
Analyzed capture efficiency for flat sheet and tubular ER geometries.
Compared model predictions with experimental data on ribosome densities.

Main Results:

ER geometry (sheets vs. tubules) creates distinct regimes of ribosome capture efficiency.
Fewer ribosomes are required on tubules compared to flat sheets for equivalent capture.
Model explains experimentally observed differences in ribosome densities on ER structures.

Conclusions:

ER geometry fundamentally constrains ribosome capture efficiency.
Cells may select specific ER structures based on protein synthesis demands.
The model provides a framework for understanding ER organization and function.