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The nucleotide sequence and protein-coding capability of the transposable element IS5
Gene
|August 1, 1981
Summary
The bacterial insertion sequence IS5 (1195 bp) has a defined nucleotide sequence, including terminal repeats and a potential protein-coding region. IS5 insertion into DNA is nonrandom, targeting specific sequences and causing duplications.
Area of Science:
- Bacterial genetics
- Molecular biology
- Genomics
Background:
- Insertion sequences (IS) are mobile genetic elements found in bacteria.
- Understanding IS element behavior is crucial for genome stability and evolution.
Purpose of the Study:
- To determine the complete nucleotide sequence of the IS5 insertion sequence.
- To analyze the insertion mechanism and target site specificity of IS5.
Main Methods:
- DNA sequencing to determine the IS5 nucleotide sequence.
- Analysis of IS5 insertion sites in bacteriophage Mu genes.
Main Results:
- The IS5 sequence is 1195 bp with 16 bp inverted terminal repeats (one mismatch).
- A single open reading frame encodes a 338-amino acid polypeptide.
- IS5 insertion results in a 4 bp duplication at a nonrandom target site (consensus: C.T/A.A.G/A).
- Insertion into bacteriophage Mu genes aided in identifying protein-coding frames.
Conclusions:
- The complete IS5 sequence provides insights into its structure and potential function.
- IS5 exhibits specific target site selection during insertion, influencing host DNA.
- This study contributes to understanding transposition mechanisms and gene identification in bacteriophages.