Progress toward characterization of the group A Streptococcus metagenome: Complete genome sequence of a macrolide-resistant serotype M6 strain

David J. Banks, Stephen F. Porcella, Kent D. Barbian, Stephen B. Beres, Lauren E. Philips, Jovanka M. Voyich, Frank R. DeLeo, Judith M. Martin, Greg A. Somerville, James M. Musser

Research output: Contribution to journalArticlepeer-review

137 Scopus citations

Abstract

We describe the genome sequence of a macrolide-resistant strain (MGAS10394) of serotype M6 group A Streptococcus (GAS). The genome is 1,900,156 bp in length, and 8 prophage-like elements or remnants compose 12.4% of the chromosome. A 8.3-kb prophage remnant encodes the SpeA4 variant of streptococcal pyrogenic exotoxin A. The genome of strain MGAS10394 contains a chimeric genetic element composed of prophage genes and a transposon encoding the mefA gene conferring macrolide resistance. This chimeric element also has a gene encoding a novel surface-exposed protein (designated "R6 protein"), with an LPKTG cell-anchor motif located at the carboxyterminus. Surface expression of this protein was confirmed by flow cytometry. Humans with GAS pharyngitis caused by serotype M6 strains had antibody against the R6 protein present in convalescent, but not acute, serum samples. Our studies add to the theme that GAS prophage-encoded extracellular proteins contribute to host-pathogen interactions in a strain-specific fashion.

Original languageEnglish (US)
Pages (from-to)727-738
Number of pages12
JournalJournal of Infectious Diseases
Volume190
Issue number4
DOIs
StatePublished - Aug 15 2004

ASJC Scopus subject areas

  • Immunology and Allergy
  • Infectious Diseases

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