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. 1990 Jan;172(1):236–242. doi: 10.1128/jb.172.1.236-242.1990

Identification, distribution, and sequence analysis of new insertion elements in Caulobacter crescentus.

N Ohta 1, D A Mullin 1, J Tarleton 1, B Ely 1, A Newton 1
PMCID: PMC208423  PMID: 2152901

Abstract

We describe two insertion elements isolated from Caulobacter crescentus that are designated IS298 and IS511. These insertion elements were cloned from spontaneous flagellar (fla) gene mutants SC298 and SC511 derived from the wild-type strain CB15 (ATCC 19089), in which they were originally identified as insertions in the flbG operon of the hook gene cluster (N. Ohta, E. Swanson, B. Ely, and A. Newton, J. Bacteriol. 158:897-904, 1984). IS298 and IS511 were each present in C. crescentus CB2 and CB15 in at least four different positions, but neither was present in strain CB13 or in several Caulobacter species examined, including C. vibrioides, C. leidyia, and C. henricii. Nucleotide sequence analysis across the chromosome-insertion element junctions showed that IS298 is located 152 base pairs (bp) upstream from the ATG translation start of the hook protein gene flaK, where it is bounded by a 4-bp direct repeat derived from the site of insertion, and that IS511 is inserted at codon 186 of the flaK coding sequence, where it is also bounded by a 4-bp direct repeat duplicated from the site of insertion. The ilvB102 mutation in strain SC125 was also shown to result from insertion sequence IS511, but no duplication of the genomic sequence was present at the insertion element junctions. IS298 contains an imperfect terminal inverted repeat 16 bp long, and IS511 contains a 32-bp inverted repeat at the termini. IS298 and IS511 are the first insertion elements described in C. crescentus.

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Selected References

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