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Insertion element analysis and mapping of the Pseudomonas plasmid alk regulon
Journal of Bacteriology
|September 1, 1979
Summary
Researchers identified new alkane utilization (alk) genes in Pseudomonas plasmids, revealing complex genetic control. This study maps alkD and alkE loci, uncovering a new alkBAE operon and multiple gene clusters essential for alkane metabolism.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Pseudomonas plasmids, particularly the Inc P-2 group, play a role in alkane utilization.
- Understanding the genetic basis of alkane metabolism is crucial for microbial biotechnology and environmental remediation.
Purpose of the Study:
- To characterize and map novel mutations in alkane utilization (alk) genes on Pseudomonas Inc P-2 plasmids.
- To elucidate the genetic organization and regulatory mechanisms governing alkane utilization in Pseudomonas.
Main Methods:
- Isolation of alk mutations via nitrosoguanidine mutagenesis and Tn7 transposition.
- Analysis of polarity effects of alk::Tn7 insertion mutations.
- Genetic mapping of alk loci in Pseudomonas aeruginosa using transduction.
Main Results:
- Discovery of two new alk loci: alkD (for alkane-oxidizing activity synthesis) and alkE (for alcohol dehydrogenase synthesis).
- Identification of an alkBAE operon based on polarity studies.
- Mapping of at least three distinct alk gene clusters (alkRD, alkBAE, alkC) on the CAM-OCT plasmid, with alkRD and alkBAE linked but alkC unlinked.
Conclusions:
- Alkane utilization in Pseudomonas involves complex genetic control with at least six genes.
- The identified alk loci and operon provide new insights into the biochemical pathways and regulation of alkane metabolism.