Abstract:
:Streptococcus intermedius is well known to produce severe infections in various areas of the body. In this study, we evaluated the ability of S. intermedius to utilise human transferrin as a source of iron and investigated the mechanism by which iron can be obtained from this plasma protein. Adding either ferrous sulfate or holotransferrin to an iron-deficient culture medium allowed growth of S. intermedius. Cultivation of S. intermedius under an iron-poor condition was associated with the over expression of a 58 kDa cell surface protein. Neither siderophore activity nor reductase activity could be detected. Moreover, cells of S. intermedius did not show transferrin-binding activity or proteolytic activity toward transferrin. It was found that S. intermedius could rapidly decrease the pH of the medium during cell growth, resulting in a release of iron from holotransferrin. When the buffering capacity of the culture medium was significantly increased, the holotransferrin could not support growth of S. intermedius. It is suggested that under certain circumstances, S. intermedius may migrate from its normal niche (oral cavity), reach a particular site and create a localised environment where the pH can be lowered with the subsequent release of iron from transferrin. This would allow bacterial growth and initiation of the infectious process.
journal_name
FEMS Microbiol Lettjournal_title
FEMS microbiology lettersauthors
Brochu V,Greinier D,Mayrand Ddoi
10.1111/j.1574-6968.1998.tb13193.xsubject
Has Abstractpub_date
1998-09-01 00:00:00pages
127-33issue
1eissn
0378-1097issn
1574-6968pii
S0378109798003218journal_volume
166pub_type
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