Staphylococcal enterotoxin-like toxins U2 and V, two new staphylococcal superantigens arising from recombination within the enterotoxin gene cluster.

Abstract:

:To test the hypothesis that the Staphylococcus aureus enterotoxin gene cluster (egc) can generate new enterotoxin genes by recombination, we analyzed the egc locus in a broad panel of 666 clinical isolates of S. aureus. egc was present in 63% of isolates, confirming its high prevalence. The archetypal organization of the egc locus, consisting of five enterotoxin genes plus two pseudogenes, was found in 409 of 421 egc-positive strains. The egc locus was incomplete in a few strains and occasionally harbored an insertion sequence and transposase genes. These strains may represent evolutionary intermediates of the egc locus. One strain with an atypical egc locus produced two new enterotoxins, designated SElV and SElU2, generated by (i) recombination between selm and sei, producing selv, and (ii) a limited deletion in the varphient1-varphient2 pseudogenes, producing selu2. Recombinant SElV and SElU2 had superantigen activity, as they specifically activated the T-cell families Vbeta 6, Vbeta 18, and Vbeta 21 (SElV) and Vbeta 13.2 and Vbeta 14 (SElU2). Immunoscope analysis showed a Gaussian CDR3 size distribution of T-cell receptor Vbeta chain junctional transcripts of expanded Vbeta subsets in toxin-stimulated cultures, reflecting a high level of polyclonality. These data show that egc is indeed capable of generating new superantigen genes through recombination.

journal_name

Infect Immun

journal_title

Infection and immunity

authors

Thomas DY,Jarraud S,Lemercier B,Cozon G,Echasserieau K,Etienne J,Gougeon ML,Lina G,Vandenesch F

doi

10.1128/IAI.00132-06

subject

Has Abstract

pub_date

2006-08-01 00:00:00

pages

4724-34

issue

8

eissn

0019-9567

issn

1098-5522

pii

74/8/4724

journal_volume

74

pub_type

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