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Molecular studies on thiaminase I.

M Abe, S Ito, M Kimoto

    Biochimica Et Biophysica Acta
    |August 25, 1987
    PubMed
    Summary
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    The thiaminase I gene from Bacillus thiaminolyticus was cloned and expressed in E. coli. This research developed a method to detect thiaminase I, revealing its different molecular weights and stability.

    Area of Science:

    • Molecular Biology
    • Enzymology
    • Microbial Genetics

    Background:

    • Thiaminase I is an enzyme produced by Bacillus thiaminolyticus.
    • Understanding the genetic basis and expression of thiaminase I is crucial for its study.

    Purpose of the Study:

    • To clone and express the thiaminase I gene from Bacillus thiaminolyticus.
    • To investigate the stability and characteristics of the expressed enzyme in different hosts.
    • To develop a detection method for thiaminase I.

    Main Methods:

    • Gene cloning of thiaminase I on a 1.6 kb DNA fragment.
    • Expression of the gene in Escherichia coli and Bacillus subtilis.
    • Plasmid stability assays in wild-type and mutant E. coli.
    • SDS-polyacrylamide gel electrophoresis for enzyme detection and size determination.

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    Main Results:

    • The thiaminase I gene was successfully cloned and expressed in E. coli and B. subtilis.
    • Plasmid stability varied, being stable in wild-type E. coli but unstable in a thiamin pyrophosphate-requiring mutant.
    • Wild-type E. coli accumulated the enzyme in its periplasm.
    • Thiaminase I from B. thiaminolyticus exists in 44 and 42 kDa forms, with the 42 kDa form degrading to ~41 kDa over time due to proteinase activity.
    • Recombinant thiaminase expressed in E. coli was 42 kDa, consistent with the intact enzyme.

    Conclusions:

    • The thiaminase I gene can be functionally expressed in heterologous hosts like E. coli.
    • The stability of the recombinant plasmid is influenced by the host's metabolic state.
    • A reliable method for detecting thiaminase I size and integrity was established, differentiating between intact and degraded forms.