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Journal of Bacteriology, November 2000, p. 6517-6522, Vol. 182, No. 22
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Exfoliatin-Producing Strains Define a Fourth
agr Specificity Group in Staphylococcus
aureus
S.
Jarraud,1
G. J.
Lyon,2,3
A. M. S.
Figueiredo,2,
Lina
Gérard,1
F.
Vandenesch,1
J.
Etienne,1
T. W.
Muir,3 and
R. P.
Novick2,*
Faculté de Médecine Laennec,
69372 Lyon Cedex 08, France1; Program in
Molecular Pathogenesis, Skirball Institute, and Department of
Microbiology, New York University School of Medicine, New York, New
York 100162; and Laboratory of
Synthetic Protein Chemistry, Rockefeller University, New York, New York
100213
Received 24 April 2000/Accepted 1 August 2000
The staphylococcal virulon is activated by the density-sensing
agr system, which is autoinduced by a short peptide
(autoinducing peptide [AIP]) processed from a propeptide encoded by
agrD. A central segment of the agr locus,
consisting of the C-terminal two-thirds of AgrB (the putative
processing enzyme), AgrD, and the N-terminal half of AgrC (the
receptor), shows striking interstrain variation. This finding has led
to the division of Staphylococcus aureus isolates into
three different agr specificity groups and to the division
of non-aureus staphylococci into a number of others. The
AIPs cross-inhibit the agr responses between groups. We
have previously shown that most menstrual toxic shock strains belong to
agr specificity group III but that no strong clinical
identity has been associated with strains of the other two groups. In
the present report, we demonstrate a fourth agr specificity
group among S. aureus strains and show that most
exfoliatin-producing strains belong to this group. A striking common
feature of group IV strains is activation of the agr
response early in exponential phase, at least 2 h earlier
than in strains of the other groups. This finding raises the question
of the biological significance of the agr autoinduction threshold.
*
Corresponding author. Mailing address: Skirball
Institute, New York University School of Medicine, 540 First Ave., New
York, NY 10016. Phone: (212) 263-6290. Fax: (212) 263-5711. E-mail: novick{at}saturn.med.nyu.edu.

Present address: Universidade Federal do Rio de Janeiro, Instituto
de Microbiologia-CCS-Bloco I Cidade Universitaria-Rio de
Janeiro, RJ
21941-390,
Brazil.
Journal of Bacteriology, November 2000, p. 6517-6522, Vol. 182, No. 22
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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