Infection and Immunity, September 1999, p. 4851-4861, Vol. 67, No. 9
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Laboratoire de Génomique des
Microorganismes Pathogènes,
Received 29 March 1999/Returned for modification 4 June
1999/Accepted 17 June 1999
We report the complete 119,443-bp sequence of the pgm
locus from Yersinia pestis and its flanking regions.
Sequence analysis confirms that the 102-kb unstable pgm
locus is composed of two distinct parts: the pigmentation segment and a
high-pathogenicity island (HPI) which carries virulence genes involved
in iron acquisition (yersiniabactin biosynthetic gene cluster). Within
the HPI, three genes coding for proteins related to phage proteins were
uncovered. They are located at both extremities indicating that the
entire HPI was acquired en bloc by phage-mediated horizontal transfer. We identified, within the pigmentation segment, two novel loci that may
be involved in virulence: a fimbriae gene cluster and a locus probably
encoding a two component regulatory system similar to the BvgAS
regulatory system of Bordetella pertussis. Three genes
containing frameshift mutations and two genes interrupted by insertion
element insertion were found within this region. To investigate
diversity among different Y. pestis and Yersinia pseudotuberculosis strains, the sequence of selected regions of the pgm locus and flanking regions were compared from 20 different Y. pestis and 10 Y. pseudotuberculosis strains. The results showed that the genes
interrupted in Y. pestis are intact in Y. pseudotuberculosis. However, one of these mutations, in the
bvgS homologue, is only present in Y. pestis
strains of biovar Orientalis and not in those of the biovars Antiqua
and Medievalis. The results obtained by analysis of variable positions
in the sequence are in accordance with historical records, confirming
that biovar Orientalis is the most recent lineage. Furthermore,
sequence comparisons among 29 Yersinia strains suggest that
Y. pestis is a recently emerged pathogen that is probably
entering the initial phase of reductive evolution.
*
Corresponding author. Mailing address: Laboratoire de
Génomique des Microorganismes Pathogènes, Institut
Pasteur, 25 rue du Dr. Roux, 75724 Paris Cedex 15, France. Phone:
(33-1) 45-68-87-48. Fax: (33-1) 45-68-87-86. E-mail:
cbuch{at}pasteur.fr.
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