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Related Experiment Videos

Molecular basis of beta-galactosidase alpha-complementation.

K E Langley, M R Villarejo, A V Fowler

    Proceedings of the National Academy of Sciences of the United States of America
    |April 1, 1975
    PubMed
    Summary

    A defective beta-galactosidase protein missing key residues was identified in E. coli. A specific peptide fragment was found to restore the missing amino acids, enabling alpha-complementation.

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    Area of Science:

    • Molecular Biology
    • Enzymology
    • Genetics

    Background:

    • Previous studies identified a cyanogen bromide peptide from beta-galactosidase (EC 3.2.1.23) with alpha-donor activity in intracistronic alpha-complementation.
    • Beta-galactosidase is crucial for lactose metabolism, and its complementation is a key system for genetic studies.

    Purpose of the Study:

    • To isolate and characterize the defective beta-galactosidase alpha-acceptor protein from the M15 deletion mutant strain of Escherichia coli.
    • To determine the specific region of beta-galactosidase absent in the M15 mutant.
    • To confirm the role of the previously identified alpha-donor peptide in restoring enzyme function.

    Main Methods:

    • Isolation of the defective beta-galactosidase alpha-acceptor protein from Escherichia coli strain M15.

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  • Cyanogen bromide peptide mapping and amino acid sequence determination of the M15 protein.
  • Comparison of the M15 peptide sequence with the corresponding peptide from wild-type beta-galactosidase.

    • Main Results:

    • The defective alpha-acceptor protein from M15 Escherichia coli was successfully isolated.
    • Sequence analysis revealed that the M15 protein lacks amino acid residues 11-41 of beta-galactosidase.
    • The isolated cyanogen bromide peptide from the M15 protein was identical to the wild-type peptide except for the missing amino acids.

    Conclusions:

    • The M15 deletion mutant strain of Escherichia coli produces a beta-galactosidase alpha-acceptor protein lacking residues 11-41.
    • The previously identified alpha-donor peptide contains the amino acid sequence necessary to restore the missing region in the M15 protein.
    • This study elucidates the structural basis of alpha-complementation in beta-galactosidase and the M15 mutant system.