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Journal of Bacteriology, October 2001, p. 5535-5543, Vol. 183, No. 19
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.19.5535-5543.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Nested Deletions of the SRL Pathogenicity Island of Shigella flexneri 2a

Sally A. Turner,1 Shelley N. Luck,1 Harry Sakellaris,1 Kumar Rajakumar,1,2 and Ben Adler1,*

Bacterial Pathogenesis Research Group, Department of Microbiology, Monash University, Victoria 3800,1 and Department of Microbiology and Infectious Diseases, Royal Children's Hospital, Parkville, Victoria 3052,2 Australia

Received 22 March 2001/Accepted 9 July 2001

In this study, we determined the boundaries of a 99-kb deletable element of Shigella flexneri 2a strain YSH6000. The element, designated the multiple-antibiotic resistance deletable element (MRDE), had recently been found to contain a 66-kb pathogenicity island (PAI)-like element (designated the SRL PAI) which carries the Shigella resistance locus (SRL), encoding resistance determinants to streptomycin, ampicillin, chloramphenicol, and tetracycline. The YSH6000 MRDE was found to be flanked by two identical IS91 elements present at the S. flexneri homologs of the Escherichia coli genes putA and mdoA on NotI fragment D. Sequence data from two YSH6000-derived MRDE deletants, YSH6000T and S2430, revealed that deletion of the MRDE occurred between the two flanking IS91 elements, resulting in a single IS91 element spanning the two original IS91 loci. Selection for the loss of tetracycline resistance confirmed that the MRDE deletion occurred reproducibly from the same chromosomal site and also showed that the SRL PAI and the SRL itself were capable of independent deletion from the chromosome, thus revealing a unique set of nested deletions. The excision frequency of the SRL PAI was estimated to be 10-5 per cell in the wild type, and mutation of a P4-like integrase gene (int) at the left end of the SRL PAI revealed that int mediates precise deletion of the PAI.

* Corresponding author. Mailing address: Department of Microbiology, Monash University, Victoria 3800, Australia. Phone: 61-3-99054815. Fax: 61-3-99054811. E-mail: Ben.Adler{at}med.monash.edu.au.

Journal of Bacteriology, October 2001, p. 5535-5543, Vol. 183, No. 19
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.19.5535-5543.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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