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. 1987 Jan;55(1):1–6. doi: 10.1128/iai.55.1.1-6.1987

Characterization of neuraminidases produced by various serotypes of group B streptococci.

J G Brown, D C Straus
PMCID: PMC260272  PMID: 3539798

Abstract

Neuraminidase produced by 11 strains of group B streptococci (GBS), from serotypes Ia, Ib, Ic, II, and III, were characterized according to molecular weight, antigenic identity, and substrate specificity. Following growth in a chemically defined medium, ammonium sulfate-concentrated culture supernatants were assayed for activity with bovine submaxillary mucin as substrate. Neuraminidase produced by GBS strain 122 (serotype III) was purified by a combination of salt fractionation, affinity chromatography with Affi-Gel Blue, ion-exchange chromatography with DEAE-cellulose, and gel filtration on Sephadex G-200. Purified neuraminidase was used to immunize rabbits, and the resultant antiserum reduced the activity of purified neuraminidase from strain 122 by 87.7%. The antiserum also reduced the activity of neuraminidases produced by the other four serotypes by between 78.3 and 90%. Molecular weight estimates of the neuraminidases produced by the various serotypes were obtained by gel filtration chromatography on Sephadex G-200. The molecular weights obtained for the neuraminidases from the representative strains of each serotype ranged from 110,000 to 180,000. In addition, all of the GBS neuraminidases examined (regardless of the producing serotype) were active only on bovine submaxillary mucin. On the basis of these results, it appears that the neuraminidases produced by different GBS serotypes are quite similar.

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Selected References

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