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A useful cloning vector for Bacillus subtilis
B Diderichsen1, G B Poulsen, S T Jørgensen
1Novo Nordisk, Bagsvoerd, Denmark.
Plasmid
|November 1, 1993
Summary
Researchers developed a stable cloning vector, pDN1050, for Bacillus subtilis using elements from Staphylococcus aureus plasmids. A mutant, pDN1370, with reduced copy number was also identified.
Area of Science:
- Molecular Biology
- Microbial Genetics
Background:
- Development of novel cloning vectors is crucial for genetic manipulation in bacteria.
- Bacillus subtilis is a key industrial microorganism, necessitating efficient genetic tools.
- Existing vectors may have limitations in stability or copy number.
Purpose of the Study:
- To construct and characterize a new small, stable cloning vector for Bacillus subtilis.
- To identify and analyze mutants with altered copy numbers for potential applications.
Main Methods:
- Plasmid construction by combining replication origins and antibiotic resistance genes.
- Transformation of Bacillus subtilis with constructed plasmids.
- Assessment of plasmid stability (segregational and structural).
- Isolation and characterization of low copy number mutants.
Main Results:
- Successfully constructed pDN1050, a stable cloning vector for Bacillus subtilis.
- pDN1050 incorporates the replication origin from Staphylococcus aureus plasmid pUB110 and the chloramphenicol resistance gene from pC194.
- Isolated pDN1370, a low copy number mutant of pDN1050.
- Identified a mutation in the repA gene of the replication protein in pDN1370.
Conclusions:
- pDN1050 is a robust and stable cloning vector suitable for Bacillus subtilis.
- The repA gene is critical for regulating the copy number of this plasmid system.
- The characterized mutant pDN1370 offers a tool for studies requiring lower plasmid concentrations.