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Related Experiment Videos

Translocation makes the ribosome less compact.

A S Spirin, V I Baranov, G S Polubesov

    Journal of Molecular Biology
    |March 5, 1987
    PubMed
    Summary
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    Ribosome translocation involves subtle structural changes. Neutron scattering reveals a slight expansion in ribosome size during the post-translocation state compared to the pre-translocation state in Escherichia coli.

    Area of Science:

    • Molecular Biology
    • Structural Biology
    • Biophysics

    Background:

    • Ribosomes are essential molecular machines responsible for protein synthesis.
    • Understanding ribosome dynamics, particularly during translocation, is crucial for deciphering gene expression.

    Purpose of the Study:

    • To investigate the structural rearrangements of translating ribosomes during translocation.
    • To compare the spatial structure of ribosomes in pre-translocation and post-translocation states.

    Main Methods:

    • Preparation of translating Escherichia coli ribosomes in specific pre- and post-translocation states using poly(U)-Sepharose columns.
    • Neutron scattering experiments at varying contrasts (H2O/D2O mixtures) to analyze ribosome structure.
    • Absence of elongation factors in final ribosome preparations.

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    Main Results:

    • The radius of gyration for post-translocation state ribosomes was slightly larger than for pre-translocation state ribosomes.
    • These structural differences were observed under high contrast conditions for the protein component.

    Conclusions:

    • Ribosome translocation is associated with measurable spatial displacements of ribosomal components.
    • These conformational changes occur on the scale of several ångström units, indicating subtle yet significant structural rearrangements.