, 77:466 | Cite as

The primary structure and characteristics of ISAfe600, an insertion sequence from Acidithiobacillus ferrooxidans strains

  • T. F. Kondrat’evaEmail author
  • V. N. Danilevich
  • G. I. Karavaiko
Experimental Articles


A new IS-like element (604 bp) was revealed in the genome of several Acidithiobacillus ferrooxidans strains isolated from diverse biotopes. It includes 26-bp imperfectly matched terminal inverted repeats (TIRs), similar in structure to the TIRs of the ISAfel insertion element. The 60-bp DNA fragment adjacent to the right TIR (TIRR) exhibits pronounced homology with the similarly located DNA fragments in ISAfel and IST445, as well as with the internal fragment of ISAfel encoding the transposase gene (nucleotides from 254 to 311 bp). The central section of ISAfe600 is unique and exhibits no homology with any prokaryotic DNA. A duplication of 8 bp of the target DNA was found in the ISAfe600 insertion site. One to four copies of ISAfe600 were revealed by Southern hybridization in the genome of A. ferrooxidans strains studied. The number of ISAfe600 copies varies depending on the growth conditions (energy substrate). Since open reading frames big enough to encode transposase are not presert in the structure of ISAfe600, it may be a deficient IS element; its translocation is possibly achieved under control of the ISAfel transposase.

Key words

Acidithiobacillus ferrooxidans insertion element DNA sequencing inverse PCR Southern blot 


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Copyright information

© MAIK Nauka 2008

Authors and Affiliations

  • T. F. Kondrat’eva
    • 1
    Email author
  • V. N. Danilevich
    • 2
  • G. I. Karavaiko
    • 1
  1. 1.Winogradsky Institute of MicrobiologyRussian Academy of SciencesMoscowRussia
  2. 2.Shemyakin-Ovchinnicov Institute of Bioorganic ChemistryRussian Academy of SciencesMoscowRussia

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