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The IS200/IS605 Family and "Peel and Paste" Single-strand Transposition Mechanism
S He1, A Corneloup1, C Guynet1
1Laboratoire de Microbiologie et Génétique Moléculaires, CNRS, Toulouse, France.
Microbiology Spectrum
|September 10, 2015
Summary
The IS200/IS605 insertion sequences (IS) utilize a unique "Peel-and-Paste" mechanism with single-strand DNA intermediates. Their transposases, distinct from classical enzymes, are crucial for this process in bacteria and archaea.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Insertion sequences (IS) are mobile genetic elements found in various organisms.
- The IS200/IS605 family exhibits unique characteristics, including single-strand DNA intermediates.
- Classical IS elements typically use double-strand DNA intermediates.
Purpose of the Study:
- To analyze the organization and distribution of the IS200/IS605 family.
- To elucidate the transposition pathway and catalytic mechanism of IS200/IS605 transposases.
- To explore the evolutionary roles of these transposases.
Main Methods:
- Review of experimental model systems (IS608 and ISDra2).
- Biochemical and genetic analyses of transposition.
- Structural data interpretation.
- Comparative genomics.
Main Results:
- IS200/IS605 family members are widespread in bacteria and archaea.
- Transposition occurs via a "Peel-and-Paste" mechanism involving single-strand DNA.
- Transposases are HuH enzymes, differing from DDE enzymes of classical IS.
- Evidence suggests domestication for palindrome multiplication and homing endonuclease functions.
Conclusions:
- The IS200/IS605 family represents a distinct class of mobile genetic elements.
- Their unique mechanism and enzyme type offer insights into transposition evolution.
- These transposases may have been co-opted for other cellular functions.
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