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Related Concept Videos

Ribosomes01:27

Ribosomes

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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 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...
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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.
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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RNA Structure01:19

RNA Structure

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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
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Nucleic Acids02:43

Nucleic Acids

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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes,...
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Improving Translational Accuracy02:07

Improving Translational Accuracy

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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Termination of Translation01:44

Termination of Translation

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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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Updated: May 29, 2025

Single Molecule Fluorescence Energy Transfer Study of Ribosome Protein Synthesis
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Single Molecule Fluorescence Energy Transfer Study of Ribosome Protein Synthesis

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How subunit rotation controls tRNA dynamics in the ribosome.

Sandra Byju, Paul C Whitford

    Biorxiv : the Preprint Server for Biology
    |February 3, 2025
    PubMed
    Summary
    This summary is machine-generated.

    Ribosome subunit rotation influences transfer RNA (tRNA) movement. Molecular simulations reveal that tRNA kinetics increase and then decrease with rotation, driven by a specific ribosomal protein.

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    Dual DNA Rulers to Study the Mechanism of Ribosome Translocation with Single-Nucleotide Resolution
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    Dual DNA Rulers to Study the Mechanism of Ribosome Translocation with Single-Nucleotide Resolution

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    Area of Science:

    • Molecular Biology
    • Biophysics
    • Structural Biology

    Background:

    • Ribosomes coordinate complex conformational changes for messenger RNA (mRNA) translation.
    • Subunit rotation and transfer RNA (tRNA) molecule displacements are key motions, but their interplay is poorly understood.
    • Existing research lacks insight into how these dynamical processes influence each other during translation.

    Purpose of the Study:

    • To investigate how ribosome subunit rotation dynamically controls tRNA kinetics.
    • To isolate specific interactions governing the relationship between subunit rotation and tRNA movement.
    • To elucidate the physicochemical mechanisms underlying ribosome dynamics.

    Main Methods:

    • Utilized all-atom structure-based molecular simulations.
    • Simulated the P/E hybrid state formation, involving tRNA displacement between ribosomal sites.
    • Systematically varied subunit rotation extent to analyze its impact on tRNA kinetics.

    Main Results:

    • Demonstrated a non-monotonic dependence of tRNA kinetics on ribosome subunit rotation.
    • Observed that tRNA kinetics initially increase and subsequently decrease as subunit rotation changes.
    • Identified a single ribosomal protein's steric contribution as the cause of this behavior.

    Conclusions:

    • Subunit rotation plays a critical role in regulating tRNA kinetics through steric interactions.
    • Provides a computational strategy for dissecting causal relationships in complex biomolecular assemblies.
    • Offers insights into the dynamic physicochemical properties of the ribosome.