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Journal of Bacteriology, January 2002, p. 134-141, Vol. 184, No. 1
0021-9193/01/$04.00+0     DOI: 10.1128/JB.184.1.134-141.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Bacillus anthracis pXO1 Plasmid Sequence Conservation among Closely Related Bacterial Species

James Pannucci, Richard T. Okinaka, Robert Sabin, and Cheryl R. Kuske*

Biosciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Received 13 June 2001/ Accepted 3 October 2001

The complete sequencing and annotation of the 181.7-kb Bacillus anthracis virulence plasmid pXO1 predicted 143 genes but could only assign putative functions to 45. Hybridization assays, PCR amplification, and DNA sequencing were used to determine whether pXO1 open reading frame (ORF) sequences were present in other bacilli and more distantly related bacterial genera. Eighteen Bacillus species isolates and four other bacterial species were tested for the presence of 106 pXO1 ORFs. Three ORFs were conserved in most of the bacteria tested. Many of the pXO1 ORFs were detected in closely related Bacillus species, and some were detected only in B. anthracis isolates. Three isolates, Bacillus cereus D-17, B. cereus 43881, and Bacillus thuringiensis 33679, contained sequences that were similar to more than one-half of the pXO1 ORF sequences examined. The majority of the DNA fragments that were amplified by PCR from these organisms had DNA sequences between 80 and 98% similar to that of pXO1. Pulsed-field gel electrophoresis revealed large potential plasmids present in both B. cereus 43881 (341 kb) and B. thuringiensis ATCC 33679 (327 kb) that hybridized with a DNA probe composed of six pXO1 ORFs.

* Corresponding author. Mailing address: Bioscience Division, M888, Los Alamos National Laboratory, Los Alamos, NM 87545. Phone: (505) 665-4800. Fax: (505) 665-3024. E-mail: Kuske{at}lanl.gov.

Journal of Bacteriology, January 2002, p. 134-141, Vol. 184, No. 1
0021-9193/01/$04.00+0     DOI: 10.1128/JB.184.1.134-141.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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