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Related Experiment Videos

Transposition in prokaryotes: transposon Tn501.

N L Brown1, L R Evans

  • 1Microbial Molecular Genetics and Cell Biology Group, School of Biological Sciences, University of Birmingham, UK.

Research in Microbiology
|July 1, 1991
PubMed
Summary

Bacterial transposons, like Tn501 and Tn21, utilize a specific transposase region to recognize terminal repeats and facilitate transposition. Over-expressing the Tn501 transposase significantly increased transposition frequency.

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Area of Science:

  • Bacterial genetics and molecular biology
  • Transposable elements and gene regulation

Background:

  • Bacteria harbor diverse transposable elements categorized into four main classes based on transposition mechanisms.
  • Class II transposons, including Tn501 and Tn21, are complex elements with short inverted repeats that transpose via a replicative mechanism, often involving a cointegrate intermediate.

Purpose of the Study:

  • To investigate the transposition mechanism of Tn501 and Tn21, closely related class II mercury-resistance transposons.
  • To identify the specific region of the transposase responsible for recognition of terminal inverted repeats and replicon fusion.

Main Methods:

  • Genetic methods were employed to study the mechanism of transposition.
  • The Tn501 transposase was over-expressed in vivo to assess its functionality and impact on transposition frequency.

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Main Results:

  • A specific region of the 989 amino acid transposase (amino acids 57–186) was identified as crucial for recognizing the 38-bp terminal inverted repeats of the transposon.
  • This region also dictates specificity for replicon fusion catalyzed by a single transposon terminus.
  • Over-expression of the functional Tn501 transposase resulted in a 10^4-fold increase in transposition frequency.

Conclusions:

  • The study elucidates the molecular basis of transposon specificity in Tn501 and Tn21.
  • The identified transposase region is key for both normal transposition and replicon fusion.
  • Enhanced expression of transposase can dramatically increase transposition rates, offering potential for genetic manipulation.