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Butirosin-biosynthetic gene cluster from Bacillus circulans
The Journal of Antibiotics
|January 2, 2001
Summary
Researchers identified a gene cluster essential for butirosin antibiotic biosynthesis in Bacillus circulans. Gene disruption confirmed the roles of btrB, btrC, btrD, and btrM in producing this 2-deoxystreptamine-containing compound.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Butirosin is a 2-deoxystreptamine (DOS)-containing aminoglycoside antibiotic.
- It is produced by non-actinomycete Bacilli, specifically Bacillus circulans.
- Previous work identified 2-deoxy-scyllo-inosose synthase as a key enzyme in DOS biosynthesis and cloned its gene (btrC).
Purpose of the Study:
- To identify and characterize the gene cluster responsible for butirosin biosynthesis.
- To investigate the function of genes within this cluster through gene disruption.
Main Methods:
- Gene-walking approach to identify genes surrounding btrC.
- Gene disruption to assess the function of identified genes.
- Database searches to infer functions of open reading frames (ORFs).
Main Results:
- A gene cluster adjacent to btrC was identified.
- Disruption of btrB, btrC, btrD, and btrM resulted in a complete loss of butirosin antibiotic production.
- These genes are confirmed as part of the butirosin biosynthetic gene cluster.
Conclusions:
- The identified gene cluster is crucial for butirosin biosynthesis.
- Specific genes (btrB, btrC, btrD, btrM) play essential roles in the antibiotic production pathway.
- Further analysis of ORFs can elucidate additional aspects of butirosin biosynthesis.