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On two transposable elements from Bacillus stearothermophilus

K Xu1, Z Q He, Y M Mao

  • 1Institute of Genetics, Fudan University, Shanghai, China.

Plasmid
|January 1, 1993
PubMed
Summary
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Researchers identified two novel transposable elements, IS5376 and IS5377, in Bacillus stearothermophilus CU21. These elements show characteristics of known transposases and belong to distinct IS families, expanding our understanding of thermophile genetics.

Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Thermophilic bacteria like Bacillus stearothermophilus are crucial in industrial processes.
  • Understanding mobile genetic elements, such as transposable elements, is key to microbial evolution and adaptation.
  • Previous research on transposable elements primarily focused on mesophilic organisms.

Purpose of the Study:

  • To identify and characterize novel transposable elements in the thermophilic bacterium Bacillus stearothermophilus CU21.
  • To determine the genetic characteristics and potential functions of these newly discovered elements.
  • To classify the identified transposable elements based on sequence homology and structural features.

Main Methods:

  • Plasmid analysis and DNA hybridization techniques were used to detect transposable elements.

Related Experiment Videos

  • Southern hybridization was employed to assess the distribution of elements across different bacterial strains.
  • Nucleotide sequencing and open reading frame (ORF) analysis were performed to predict coding products.
  • Sequence homology searches were conducted against known transposable element databases.

    • Main Results:

    • Two distinct transposable elements, designated IS5376 and IS5377, were identified in Bacillus stearothermophilus CU21.
    • Both elements exhibited characteristic features, including terminal inverted repeats and adjacent direct repeats of target DNA.
    • IS5376 contained two ORFs, while IS5377 had one ORF, with deduced products showing homology to known transposases.
    • Sequence analysis indicated that IS5376 belongs to the IS21 family and IS5377 to the IS4 family.

    Conclusions:

    • IS5376 and IS5377 represent novel transposable elements in a thermophilic bacterium.
    • The identified elements possess functional ORFs encoding putative transposases, suggesting their role in DNA transposition.
    • The classification of these elements into IS21 and IS4 families provides insights into the evolutionary relationships of mobile genetic elements in thermophiles.