Characterization and distribution of two insertion sequences, IS1191 and iso‐IS981, in Streptococcus thermophilus: does intergeneric transfer of insertion sequences occur in lactic acid bacteria co‐cultures?

Molecular Microbiology - Tập 16 Số 1 - Trang 69-78 - 1995
Gérard Guédon1, Florence Bourgoin1, M. Pébay1, Yvonne Roussel1, C Colmin1, Jean-Marc Simonet1, Bernard Decaris1
1Laboratoire de génétique et microbiologie

Tóm tắt

Summary

A chromosomal repeated sequence from Streptococcus thermophilus was identified as a new insertion sequence (IS), IS1191. This is the first IS element characterized in this species. This 1313 bp element has 28 bp imperfect terminal inverted repeats and is flanked by short direct repeats of 8bp. The single large open reading frame of IS1191 encodes a 391‐amino‐acid protein which displays homologies with transposases encoded by IS1201 from Lactobacillus helveticus (44.5% amino‐acid sequence identity) and by the other ISs of the IS256 family. One of the copies of IS 1191 is inserted into a truncated iso‐IS981 element. The nucleotide sequences of two truncated iso‐IS981 s from S. thermophilus and the sequence of IS981 element from Lactococcus lactis share more than 99% identity. The distribution of these insertion sequences in L. lactis and S. thermophilus strains suggests that intergeneric transfers occur during co‐cultures used in the manufacture of cheese.

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Molecular Microbiology

Tập 16 Số 1

69-78

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