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Hypertransposing derivatives of the streptomycete insertion sequence IS493
1Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285.
Gene
|September 15, 1994
Summary
Engineered transposons from Streptomyces lividans insertion sequence IS493 show enhanced transposition. This discovery facilitates genetic manipulation and mutant library creation in Streptomyces species like S. griseofuscus and S. fradiae.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Streptomyces lividans insertion sequence IS493 derivatives are valuable tools for genetic analysis.
- Optimizing transposon systems is crucial for efficient genetic manipulation in Streptomyces species.
Purpose of the Study:
- To develop a hypertransposing element derived from IS493 for enhanced genetic manipulation.
- To investigate the transposition efficiency and target site specificity of a novel IS493 derivative, Tn5099-10.
Main Methods:
- Construction of a hypertransposing cassette using the left inverted repeat (IR-L) from Tn5099-10.
- Comparative analysis of transposition frequencies of IS493 derivatives in Streptomyces griseofuscus and Streptomyces fradiae.
- Identification of target sequences for Tn5099-10 insertions.
Main Results:
- Tn5099-10 exhibited significantly higher transposition frequencies (1000-fold in S. griseofuscus, tenfold in S. fradiae) compared to other IS493 derivatives.
- A hypertransposing cassette was successfully constructed, enabling transposition outside the inverted repeats.
- Target site analysis confirmed a consensus sequence (gNCaNTgNNy) for IS493 derivatives.
Conclusions:
- The engineered Tn5099-10 element represents a significant advancement for efficient genetic manipulation in Streptomyces.
- This hypertransposing system simplifies the preparation of transposition mutant libraries in broth culture for S. griseofuscus and S. fradiae.