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Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity

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Truncated forms of IS911 transposase downregulate transposition.

Erwan Gueguen¹, Philippe Rousseau, Guy Duval-Valentin

¹Laboratoire de Microbiologie et de Génétique Moléculaire, UMR 5100 CNRS (Campus Paul Sabatier), 118 route de Narbonne, 31062 Toulouse Cedex 09, France.

Molecular Microbiology

|November 3, 2006

Summary

IS911 transposition activity is reduced at higher temperatures due to truncated transposase (OrfAB) derivatives. Mutations can restore high transposition activity, revealing complex temperature sensitivity mechanisms.

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Live-Cell Imaging of Transcriptional Activity at DNA Double-Strand Breaks

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Area of Science:

Molecular Biology
Genetics
Microbiology

Background:

IS911 transposition is regulated by temperature, with reduced activity at higher temperatures.
Transposase (OrfAB) derivatives, including OrfAB*, are naturally produced and influence transposition.
OrfAB* levels increase with temperature, suggesting a role in temperature-dependent regulation.

Purpose of the Study:

Investigate the mechanism of temperature-sensitive transposition in IS911.
Identify genetic elements responsible for reduced transposition at elevated temperatures.
Explore strategies to engineer transposition-proficient IS911 variants at higher temperatures.

Main Methods:

Analysis of OrfAB derivatives and their impact on transposition in vivo and in vitro.
Isolation and characterization of point mutants affecting IS911 transposition activity at 42°C.
Assessment of OrfAB* levels and transposition efficiency in wild-type and mutant strains.

Main Results:

OrfAB* production is temperature-dependent and inhibits transposition.
Mutations in both N-terminal and C-terminal domains of OrfAB affect transposition activity and OrfAB* levels.
Combined N- and C-terminal mutations lead to high transposition activity resistant to temperature, with reduced OrfAB*.

Conclusions:

IS911 transposition temperature sensitivity is complex, involving multiple mechanistic components.
Truncated transposase derivatives play a significant role in temperature-dependent regulation.
Understanding these mechanisms has implications for other temperature-sensitive transposons and insertion sequences.