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Related Experiment Videos

Mutations that affect lamB gene expression at a posttranscriptional level.

M Schwartz, M Roa, M Débarbouillé

    Proceedings of the National Academy of Sciences of the United States of America
    |May 1, 1981
    PubMed
    Summary

    Maltose-resistant mutants of Escherichia coli were identified. These mutants prevent lethal synthesis of a hybrid LamB-LacZ protein by altering translation initiation, thus avoiding membrane damage.

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    Expression of a new operon from Bacillus subtilis, ykzB-ykoL, under the control of the TnrA and PhoP-phoR global regulators.

    Journal of bacteriology·2000

    Area of Science:

    • Molecular Biology
    • Genetics
    • Microbiology

    Background:

    • Escherichia coli strains were engineered with a hybrid lamB-lacZ gene.
    • Expression of the lamB-lacZ hybrid protein led to lethal membrane damage due to incomplete export.

    Purpose of the Study:

    • To investigate the genetic basis of maltose resistance in strains expressing the lethal lamB-lacZ hybrid protein.
    • To identify mutations that prevent the synthesis of the toxic hybrid protein.

    Main Methods:

    • Isolation and characterization of maltose-resistant mutants from a sensitive strain.
    • Analysis of mutations affecting the lamB-lacZ hybrid gene expression.
    • Investigating the effects of mutations on protein synthesis and mRNA structure.

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    Main Results:

    • A class of maltose-resistant mutants was obtained.
    • These mutants failed to produce the lamB-lacZ hybrid protein but retained lacY expression.
    • Mutations included deletions within the hybrid gene and point mutations affecting translation initiation, including the ribosome binding site and coding region.

    Conclusions:

    • Mutations conferring maltose resistance disrupt the synthesis of the toxic lamB-lacZ hybrid protein.
    • These mutations provide insights into the regulation of translation initiation and mRNA structure in Escherichia coli.
    • Understanding these mechanisms can help prevent issues related to toxic protein expression and export.