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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...

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...

Ribosomal RNA Synthesis

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.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...

Ribosomal RNA Synthesis

Ribosomal RNA Synthesis

Ribosome Profiling

Ribosome Profiling

Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...

Termination of Translation

Termination of Translation

The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...

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Related Experiment Video

Updated: Feb 2, 2026

An Experimental Study on Colorado Potato Beetle Hibernation Under Natural Conditions

An Experimental Study on Colorado Potato Beetle Hibernation Under Natural Conditions

Published on: November 17, 2023

Ribosome Hibernation.

Thomas Prossliner¹, Kristoffer Skovbo Winther¹, Michael Askvad Sørensen¹

¹Department of Biology, University of Copenhagen, DK-2200 Copenhagen, Denmark;

Annual Review of Genetics

|November 27, 2018

Summary

This summary is machine-generated.

Bacteria reduce costly protein synthesis under stress using specialized ribosome hibernation factors. These factors ensure basal translation and rapid reactivation when conditions improve, conserving cellular resources.

Keywords:

100S dimers nutrient stress ribosome ribosome hibernation stationary phase translation

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Last Updated: Feb 2, 2026

An Experimental Study on Colorado Potato Beetle Hibernation Under Natural Conditions

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Published on: November 17, 2023

Chromatographic Purification of Highly Active Yeast Ribosomes

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Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Isolation of Translating Ribosomes Containing Peptidyl-tRNAs for Functional and Structural Analyses

Published on: February 25, 2011

Area of Science:

Molecular Biology
Bacteriology
Cellular Regulation

Background:

Protein synthesis is resource-intensive for cells.
Bacteria employ mechanisms to reduce protein synthesis during unfavorable conditions.
Ribosome-associated factors regulate translation during stress.

Purpose of the Study:

To review stationary phase-specific translation factors.
To highlight ribosome hibernation factors and their roles.
To discuss translational regulation in response to stress.

Main Methods:

Literature review of current research.
Analysis of ribosome-associated factors in bacteria (e.g., E. coli).
Examination of translation inhibition mechanisms.

Main Results:

Stationary phase involves diverse ribosome subpopulations.
Factors like RaiA, RMF, and HPF induce hibernating states (70S monomers, 100S dimers).
Other factors (RsfS, YqjD, SRA, EttA) inhibit translation at various stages.

Conclusions:

Bacterial stress response involves complex translational control.
Ribosome hibernation factors are crucial for resource conservation.
These mechanisms ensure efficient translation reactivation upon recovery.