Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Transposition of IntAs into the Conserved Regions of IS3 Family Elements

  • Han, Chang-Gyun (The Institute of Physical and Chemical Research (Riken))
  • Published : 2004.03.01
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Abstract

Together with the previous reports, my computer survey revealed that several bacteria contain six copies of the type group II intron IntA. The sequence analysis of IntAs showed the high level of homology in the nucleotide sequence (91.9-99.8%). The consensus sequence, 2,270 base pair long, was derived from the nucleotide sequences of all IntA members. The size of the open reading frame intA was 502 amino acids long, that is homologous to reverse transcriptase-like proteins encoded within the group II introns. It was reported that EPEC.IntA and Sf.IntA were inserted into IS911 and IS629, respectively. The sequence of the flanking region IntA was analyzed here. The data show the insertion of EC.IntA into IS629, the insertion of EHEC.IntA into IS3, the insertion of Yp.IntA into IS904-like sequence, and the insertion of EK12.IntA into IS911. Interestingly, these IS elements nested by IntAs were the members of IS3 family elements. The sequences of the IS3 members correspond to the OrfB with the DDE motif conserved in retroviral integrases. Alignment of the flanking sequences of IntAs revealed that the flanking regions -25 to + 10 of insertion sites, that are generally believed to be required for the retrohoming, were not strongly conserved. The data presented here suggests that the retrohoming pathway of IntA seems to differ from those of other group II introns.

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