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Related Concept Videos

Ribosomes01:27

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...
Ribosomes01:27

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...
Ribosomes01:27

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...
Ribosomes01:27

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...
Prokaryotic vs. Eukaryotic Cells01:28

Prokaryotic vs. Eukaryotic Cells

Prokaryotic and eukaryotic cells represent two fundamental types of cellular organization, differing significantly in structure, complexity, and function. These distinctions underpin the biological diversity seen across domains of life.Prokaryotic Cell CharacteristicsProkaryotic cells, exemplified by bacteria and archaea, are structurally simple and lack membrane-bound organelles, including a nucleus. Their genetic material consists of a single, circular DNA molecule in the nucleoid region,...
Ribosomal RNA Synthesis02:53

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,...

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Peering at Brain Polysomes with Atomic Force Microscopy
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Peering at Brain Polysomes with Atomic Force Microscopy

Published on: March 16, 2016

One core, two shells: bacterial and eukaryotic ribosomes.

Sergey Melnikov1, Adam Ben-Shem, Nicolas Garreau de Loubresse

  • 1Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France.

Nature Structural & Molecular Biology
|June 6, 2012
PubMed
Summary

Bacterial and eukaryotic ribosomes share a core structure but have unique features. Comparing their structures reveals evolutionary adaptations and functional differences in protein biosynthesis across life domains.

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Last Updated: May 21, 2026

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09:16

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Evolutionary Biology

Background:

  • Ribosomes are essential molecular machines responsible for protein biosynthesis.
  • Both bacteria and eukaryotes possess ribosomes, which are crucial for life.
  • These ribosomes share a conserved core but exhibit domain-specific variations.

Purpose of the Study:

  • To compare the structural features of bacterial and eukaryotic ribosomes.
  • To identify bacteria- or eukaryote-specific structural elements.
  • To discuss the functional implications of these structural differences.

Main Methods:

  • X-ray crystallography was used to determine eukaryotic ribosome structures.
  • Comparison of newly determined eukaryotic structures with existing bacterial ribosome structures.
  • Analysis of specific structural variations between bacterial and eukaryotic ribosomes.

Main Results:

  • Identified distinct structural features unique to bacterial ribosomes.
  • Identified distinct structural features unique to eukaryotic ribosomes.
  • Highlighted conserved core elements present in both ribosomal types.

Conclusions:

  • Bacterial and eukaryotic ribosomes evolved from a common ancestor.
  • Domain-specific additions to the conserved core confer unique functionalities.
  • Structural differences provide insights into the diverse roles of ribosomes in different life forms.