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. 1983 Aug;41(2):507–515. doi: 10.1128/iai.41.2.507-515.1983

Neuraminidase production by a Streptococcus sanguis strain associated with subacute bacterial endocarditis.

D C Straus, C Portnoy-Duran
PMCID: PMC264670  PMID: 6874067

Abstract

The properties of an extracellular neuraminidase produced by a Streptococcus sanguis strain (isolated from a confirmed case of subacute bacterial endocarditis) during growth in a defined medium was examined in this investigation. This enzyme, isolated from concentrated culture supernatants of S. sanguis biotype II, was active against human alpha-1 acid glycoprotein, N-acetylneuramin lactose, bovine submaxillary mucin, and fetuin. Neuraminidase production paralleled bacterial growth in defined medium and was maximal in the early stationary phase of growth but decreased dramatically, probably owing to protease production, during the late stationary phase. The enzyme was purified to near homogeneity by a combination of salt fractionation, ion-exchanged chromatography on DEAE-Sephacel, and gel filtration on Sephadex G-200. These procedures yielded an enzyme preparation that possessed a specific activity of 174.4 mumol of sialic acid released per min per mg of protein against human alpha-1 acid glycoprotein. The Km value for this enzyme with human alpha-1 acid glycoprotein as substrate was 2.5 X 10(-3) M, and the enzyme possessed a pH optimum of 6.5. The S. sanguis neuraminidase had a molecular weight of approximately 85,000 as estimated by gel filtration and approximately 90,000 when analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The enzyme was stable at temperatures of 4 and 37 degrees C for 3 h, but approximately 50% of the enzymatic activity was lost within 30 min at 50 degrees C, with 100% of the enzymatic activity being destroyed within 10 min at temperatures of greater than or equal to 65 degrees C.

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Selected References

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