Effect of mucin and glucose on proteolytic and glycosidic activities of Streptococcus oralis

A. M. Rafay, K. A. Homer*, D. Beighton

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةArticleمراجعة النظراء

15 اقتباسات (Scopus)

ملخص

The production of glycosidase and protease activities, which may play a role in the degradation of human glycoproteins, by Streptococcus oralis strains isolated from endocarditis, septicaemia or the oral cavity was investigated with a range of fluorogenic substrates. The pH optima of the proteases ranged from 6.0 to 9.3 and the pH optima for the glycosidases were lower (4.5-6.0), although the pH range over which both groups of enzymes acted was broad. Growth in a minimal medium supplemented with glucose resulted in repression of glycosidase activities and elevated proteolytic activity. Bacteria from cultures supplemented with porcine gastric mucin (PGM), a model glycoprotein, exhibited higher levels of glycosidase activity, while proteolytic activity was suppressed and glycoprotein-derived monosaccharides were transported at significantly higher rates than those observed for cells grown in media with glucose. PGM-derived cells also exhibited high levels of N-acetylneuraminate pyruvate-lyase, the first intracellular enzyme in the pathway of sialic acid catabolism. Taken together, these data indicate that S. oralis strains produce a range of proteolytic and glycosidic enzymes that may play a role in the degradation of host-derived glycoproteins.

اللغة الأصليةEnglish
الصفحات (من إلى)409-417
عدد الصفحات9
دوريةJournal of Medical Microbiology
مستوى الصوت44
رقم الإصدار6
المعرِّفات الرقمية للأشياء
حالة النشرPublished - 1996
منشور خارجيًانعم

ASJC Scopus subject areas

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