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. 1994 Aug;60(8):2818–2825. doi: 10.1128/aem.60.8.2818-2825.1994

Transposition in Lactobacillus sake and its abolition of lactocin S production by insertion of IS1163, a new member of the IS3 family.

M Skaugen 1, I F Nes 1
PMCID: PMC201728  PMID: 7521995

Abstract

This report presents the nucleotide sequence and insertional activity of IS1163, which is a new member of the IS3 family of transposable elements. Analysis of spontaneous mutants of the lactocin S-producing Lactobacillus sake strain L45 show that the bacteriocin-negative phenotype is due to either loss of the producer plasmid or the insertion of IS1163 into the lactocin S operon (las operon). The data further show that insertional inactivation of the lactocin S operon is the result of a transposition event involving a chromosomally located donor copy of IS1163. Although the insertions described are clustered within a 250-bp region of the las operon, there are no features of the insertion sites to suggest target-specific insertion of IS1163. The overlapping, frameshifted organization of the two major open reading frames found in IS1163 is typical for the IS3 family, but the structure of the putative frameshift region includes features which distinguish IS1163 from the other members of the group. The insertional activity of IS1163 in L. sake L45 has aided in identifying regions of pCIM1 essential for lactocin S production and may have further practical applications as a mutational tool in L. sake.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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