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Infect. Immun., 07 1996, 2408-2414, Vol 64, No. 7
B Dassy and JM Fournier
Capsule formation is believed to have a significant role in bacterial
virulence. To examine the possible involvement of capsular polysaccharide
(CP) from Staphylococcus aureus in the pathological mechanisms associated
with staphylococcal infections, we investigated the influence of
respiratory activity on type 5 CP production by S. aureus grown in the
presence of various concentrations of dissolved oxygen or nitrate. The
effects of several metabolic inhibitors (arsenite, cyanide, azide,
trimethylamine N-oxide, 2-heptyl-4- hydroxyquinoline N-oxide, and
2,4-dinitrophenol) were also tested. The metabolism of the bacteria was
estimated by measuring their reductive capacity and by monitoring the pH
and concentrations of fermentation products. Type 5 CP was always produced
by S. aureus during the exponential phase of growth under all culture
conditions tested. In contrast, post-exponential-phase CP production
appeared to be strictly dependent on the respiratory activity. Since
post-exponential-phase CP production contributes at least two-thirds of the
total CP obtained, the influence of S. aureus respiration on CP production
might be of some importance in the process of infection.
Copyright © 1996, American Society for Microbiology
Respiratory activity is essential for post-exponential-phase production of type 5 capsular polysaccharide by Staphylococcus aureus
Departement d'Ecologie, Insitut Pasteur, Paris, France.
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