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Related Experiment Videos

The cloned Streptomyces bikiniensis A-factor determinant.

S Horinouchi, M Nishiyama, H Suzuki

    The Journal of Antibiotics
    |May 1, 1985
    PubMed
    Summary

    Researchers cloned a 1.1-kilobase fragment responsible for A-factor production in Streptomyces. This fragment enables A-factor synthesis in various Streptomyces strains, indicating common metabolic precursors.

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    Area of Science:

    • Molecular Biology
    • Microbial Genetics
    • Biochemistry

    Background:

    • A-factor is a crucial regulatory substance in streptomycin production by Streptomyces bikiniensis.
    • Understanding the genetic basis of A-factor biosynthesis is key to controlling secondary metabolite production in Streptomyces.

    Purpose of the Study:

    • To identify and characterize the DNA fragment responsible for A-factor determinant.
    • To investigate the potential for heterologous expression of A-factor synthesis in other Streptomyces species.

    Main Methods:

    • Restriction enzyme digestion and DNA fragment cloning.
    • Plasmid construction (pAFB15) and transformation into Streptomyces mutants.
    • Promoter analysis using a promoter-probe vector (pARC 1).

    Main Results:

    • A 1.1-kilobase fragment containing the A-factor determinant was isolated.
    • The cloned fragment conferred high-level A-factor production in deficient mutants of S. bikiniensis, S. griseus, and S. coelicolor.
    • A transcriptional control signal was identified within the 1.1-kb fragment.
    • Heterologous expression in A-factor-negative strains demonstrated a gene dosage effect, suggesting conserved metabolic pathways.

    Conclusions:

    • The 1.1-kb fragment encodes essential functions for A-factor biosynthesis.
    • A-factor precursors are likely common metabolites across diverse Streptomyces species.
    • The introduction of this single genetic determinant is sufficient for de novo A-factor synthesis in many Streptomyces strains.

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