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- W2075882822 abstract "ABSTRACT Although the staphylococcal methicillin resistance determinant, mecA , resides on a mobile genetic element, staphylococcus cassette chromosome mec (SCC mec ), its distribution in nature is limited to as few as five clusters of related methicillin-resistant Staphylococcus aureus (MRSA) clones. To investigate the potential role of the host chromosome in clonal restriction of the methicillin resistance determinant, we constructed plasmid pYK20, carrying intact mecA , and introduced it into several methicillin-susceptible Staphylococcus aureus strains, five of which were naive hosts (i.e., mecA not previously resident on the host chromosome) and five of which were experienced hosts (i.e., methicillin-susceptible variants of MRSA strains from which SCC mec was excised). We next assessed the effect of the recipient background on the methicillin resistance phenotype by population analysis, by assaying the mecA expression of PBP2a by Western blot analysis, and by screening for mutations affecting mecA . Each experienced host transformed with pYK20 had a resistance phenotype and expressed PBP2a similar to that of the parent with chromosomal SCC mec , but naive hosts transformed with pYK20 selected against its expression, indicative of a host barrier. Either inducible β-lactamase regulatory genes blaR1 - blaI or homologous regulatory genes mecR1 - mecI , which control mecA expression, acted as compensatory elements, permitting the maintenance and expression of plasmid-carried mecA ." @default.
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- W2075882822 date "2003-09-15" @default.
- W2075882822 modified "2023-10-17" @default.
- W2075882822 title "Jumping the Barrier to β-Lactam Resistance in <i>Staphylococcus aureus</i>" @default.
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- W2075882822 doi "https://doi.org/10.1128/jb.185.18.5465-5472.2003" @default.
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