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Tn5401, a new class II transposable element from Bacillus thuringiensis

J A Baum1

  • 1Ecogen Inc., Langhorne, Pennsylvania 19047-1810.

Journal of Bacteriology
|May 1, 1994
PubMed
Summary

A new Bacillus thuringiensis transposon, Tn5401, was identified with unique characteristics and transposition mechanisms. This class II element, distinct from Tn4430, shows preferential plasmid integration and replicative transposition.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Transposable elements (TEs) are mobile genetic sequences that play crucial roles in genome evolution.
  • Bacillus thuringiensis harbors various transposable elements, some associated with insecticidal genes.
  • Understanding TE mechanisms is vital for genetic engineering and understanding bacterial adaptation.

Purpose of the Study:

  • To characterize a newly discovered class II transposable element, Tn5401, from Bacillus thuringiensis.
  • To elucidate the transposition mechanism and regulatory elements of Tn5401.
  • To compare Tn5401 with other known Bacillus thuringiensis transposons.

Main Methods:

  • Sequence analysis of the 4,837-bp transposon Tn5401.
  • Southern blot analysis to determine Tn5401 prevalence.
  • Transposition assays using a temperature-sensitive shuttle vector in Bacillus thuringiensis.
  • Primer extension analysis to map transcriptional start sites.

Main Results:

  • Tn5401 possesses two large open reading frames encoding putative recombinase and transposase, and 53-bp terminal inverted repeats.
  • Tn5401 is not commonly found in other Bacillus thuringiensis subspecies and is not linked to insecticidal genes.
  • Transposition is replicative, favors plasmid targets, and generates 5-bp target duplications.
  • Two promoters (PL and PR) regulate gene expression and are negatively controlled by the TnpI protein.

Conclusions:

  • Tn5401 represents a novel class II transposable element with distinct characteristics and transposition behavior.
  • The conserved sequence element ATGTCCRCTAAY is implicated in TnpI binding, cointegrate resolution, and regulation of transposition.
  • Tn5401's unique features offer insights into the diversity and evolution of bacterial mobile genetic elements.

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