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Limited repertoire of the C-terminal region of the M protein in Streptococcus pyogenes

W.A. Relf , K.S. Sriprakash
DOI: http://dx.doi.org/10.1111/j.1574-6968.1990.tb03848.x 345-349 First published online: 1 September 1990


We have amplified genomic sequences (emm) that may encode M protein from strains of Streptococcus pyogenes using the polymerase chain reaction (PCR). Genomic DNA from 22 isolates representing 14 M scrotypes was selected for the study. Primers which corresponded to the observed C-terminal sequences of emm 6, emm 49 and enn X were used. PCR products using emm 6 and emm 49 oligonucleotides were classified into two mutually exclusive groups which corresponded to the presence or absence of serum opacity factor. These findings support the concept of limited heterogeneity in the C-terminal sequences of the M protein.

Key words
  • Streptococcus pyogenes
  • M protein
  • Polymerase chain reaction
  • Opacity factor

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