Abstract
The β-lactams are among the most commonly used antibiotics in clinical practice. It is known that the molecular targets of β-lactam antibiotics are penicillin-binding proteins (PBPs) located in the cytoplasmic membrane of both Gram-negative and Gram-positive bacteria [24,32]. The PBPs are enzymes involved in the synthesis of peptidoglycan which plays an important role in confering rigidity and osmotic stability on the bacterial envelope [32]. Disruption of the synthesis of peptidoglycan by β-lactam antibiotics causes morphological changes and eventually lysis of the bacterial cells. Recently we found that growth of K. pneumoniae in the presence of subinhibitory concentrations of cephalosporins (not affecting growth rate) caused reduction in the production of siderophores and also in capsule formation [12]. The reduction in capsule resulted in rapid agglutination of the antibiotic treated cells of encapsulated K. pneumoniae by antisera raised against a non-encapsulated strain of K. pneumoniae[12]. This was found to be due to the exposure of outer membrane proteins antigens and possibly also lipopolysaccharide on the surface of encapsulated K. pneumoniae after growth in the presence of cephalosporins (submitted for publication).
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Kadurugamuwa, J.L., Anwar, H., Brown, M.R.W., Zak, O. (1985). Exposure of protein antigens and reduction of siderophore production after growth of Gram-negative bacteria in Subinhibitory concentrations of cephalosporins. In: Adam, D., Hahn, H., Opferkuch, W. (eds) The Influence of Antibiotics on the Host-Parasite Relationship II. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-70748-3_4
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DOI: https://doi.org/10.1007/978-3-642-70748-3_4
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