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Ribosomal mutation in Escherichia coli affecting membrane stability

A Bosl, A Böck

    Molecular & General Genetics : MGG
    |January 1, 1981
    PubMed
    Summary

    Mutations in ribosomal protein L6 disrupt cell viability and subunit assembly at cold temperatures. These defects are linked to abnormal interactions with the cytoplasmic membrane, affecting membrane stability during cold shock.

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    Area of Science:

    • Cellular biology
    • Molecular genetics
    • Biochemistry

    Background:

    • Ribosomal proteins are essential for protein synthesis and cellular function.
    • Cold shock can significantly impact cellular processes, including membrane stability and ribosome assembly.
    • Ribosomal protein L6 plays a critical role in ribosome structure and function.

    Purpose of the Study:

    • To investigate the functional consequences of mutations in ribosomal protein L6.
    • To elucidate the mechanisms underlying cold sensitivity in cells with altered ribosomal protein L6.
    • To explore the relationship between ribosome assembly defects and cytoplasmic membrane stability under cold stress.

    Main Methods:

    • Analysis of cell viability at low temperatures (0 degrees C).
    • Assessment of compound influx across the cell membrane at low temperatures.
    • Investigation of 30S and 50S ribosomal subunit assembly and maturation under cold conditions.
    • Examination of the interaction between ribosomes and the cytoplasmic membrane.

    Main Results:

    • Mutations in ribosomal protein L6 lead to loss of cell viability at 0 degrees C, which is partially rescued by sodium chloride or sucrose.
    • Low temperatures induce an influx of compounds into cells with mutated ribosomal protein L6.
    • Ribosome assembly and maturation of 30S and 50S subunits are defective at low temperatures in these mutants.
    • Abnormal interactions between immature subunits or mutant 70S ribosomes and the cytoplasmic membrane are observed.

    Conclusions:

    • Ribosomal protein L6 mutations confer cold sensitivity due to impaired ribosome assembly and maturation at low temperatures.
    • The observed cold sensitivity is associated with altered cytoplasmic membrane permeability and stability.
    • Aberrant ribosome-membrane interactions are proposed as a key factor triggering membrane instability during cold shock in these mutants.

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