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Insertion sequence IST3091 of Thiobacillus ferrooxidans
L Chakravarty1, J D Kittle, O H Tuovinen
1Environmental Science Graduate Program, Ohio State University, Columbus 43210-1086, USA.
Canadian Journal of Microbiology
|June 1, 1997
Summary
A novel insertion sequence, IST3091, was identified in Thiobacillus ferrooxidans. Its transposition function was confirmed in Escherichia coli, demonstrating its potential as a mobile genetic element.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Insertion sequences (IS) are mobile genetic elements that play roles in genome evolution.
- Plasmid pTFI91 from Thiobacillus ferrooxidans harbors genetic elements with potential for transposition.
- Understanding IS elements is crucial for studying bacterial adaptation and genetic diversity.
Purpose of the Study:
- To characterize a newly identified insertion sequence, IST3091, from Thiobacillus ferrooxidans.
- To investigate the transposition capability of IST3091.
- To analyze the genetic features and similarities of IST3091 with known IS elements.
Main Methods:
- DNA sequencing of the IST3091 element and its flanking regions.
- Cloning of IST3091-containing fragments into a shuttle vector (pHSG398).
- Transformation into an Escherichia coli host and subsequent conjugation experiments to assess transposition.
- Polymerase chain reaction (PCR) amplification to detect the presence of the transposed element.
Main Results:
- IST3091 is a 1063 bp insertion sequence with partially matched 30-bp terminal inverted repeats.
- The transposase gene of IST3091 shows similarity to those of IS30, IS1086, IS4351, and a bacteriophage integrase.
- Transposition of IST3091 was successfully demonstrated in an Escherichia coli system via conjugation.
Conclusions:
- IST3091 is a functional transposable element identified in Thiobacillus ferrooxidans.
- Its sequence homology suggests a relationship with other known IS families.
- The study confirms the mobility of IST3091, providing insights into its potential role in bacterial genome dynamics.