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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Involvement of penicillin-binding protein 2 with other penicillin-binding proteins in lysis of Escherichia coli by some beta-lactam antibiotics alone and in synergistic lytic effect of amdinocillin (mecillinam).

Compared with cefotaxime, ceftazidime, moxalactam, and aztreonam, ceftriaxone produced the best lytic and bactericidal effects when each was added at about 10 times the MIC to Escherichia coli W7. When each of these antibiotics was added at its MIC, only bacteriostasis occurred, but the simultaneous addition of amdinocillin (mecillinam) was synergistic in causing rapid lysis and bactericidal effects. Induction of lysis of two E. coli mutants containing either a thermosensitive penicillin-binding protein (PBP) 2 or 3 by relatively PBP 3-specific (aztreonam) and PBP 2-specific (amdinocillin) antibiotics indicated that inhibition of only PBPs 2 and 3 can cause lysis. Examination of the interactions of cefotaxime, aztreonam, and cefsulodin, with or without amdinocillin, with their targets suggested that other combinations of PBPs could be involved in the onset of lysis. However, inhibition of both PBPs 2 and 3 may explain the better lysis-inducing activity of ceftriaxone (which binds well to both of these PBPs), as well as the synergistic effect of amdinocillin when added together with low concentrations of other beta-lactam antibiotics that interact with PBP 3.[1]


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