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J Bacteriol. 1990 January; 172(1): 143-148

research-article

Characterization of IS476 and its role in bacterial spot disease of tomato and pepper.

Department of Genetics, University of California, Berkeley 94720.

ABSTRACT

IS476 is an endogenous insertion sequence present in copper-tolerant strains of Xanthomonas campestris pv. vesicatoria. Sequence analysis has revealed that the element is 1,225 base pairs in length, has 26-base-pair inverted repeats, and causes a 4-base-pair target site duplication upon insertion into the avirulence gene avrBs1. Comparison of the full-length sequence with sequences in the National Biomedical Research Foundation and National Institutes of Health data bases showed that one of the predicted IS476 proteins is partially homologous to the putative transposase of IS3 from Escherichia coli, and the inverted repeats of IS476 have significant homology to the inverted repeats of the IS51 insertion sequence of Pseudomonas syringae pv. savastanoi. A transposition assay based on the insertional inactivation of the sacRB locus of Bacillus subtilis was used to demonstrate that one of the three copies of IS476 residing on the 200-kilobase copper plasmid pXVCU1 is capable of transposition in several strains of Xanthomonas campestris. The position of IS476 insertion in several avrBs1 mutants was established and was shown to influence both induction of hypersensitivity and bacterial growth in planta.

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