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Antimicrobial Agents and Chemotherapy, 05 1996, 1301-1303, Vol 40, No. 5
Copyright © 1996 by the American Society for Microbiology. All rights reserved.

50S ribosomal subunit synthesis and translation are equivalent targets for erythromycin inhibition in Staphylococcus aureus

WS Champney and R Burdine
Department of Biochemistry, J.H.Quillen College of Medicine, East Tennessee, State University, Johnson City 37614, USA.

Macrolide antibiotics like erythromycin can prevent the formation of the 50S ribosomal subunit in growing bacterial cells, in addition to their inhibitory effect on translation. The significance of this novel finding has been further investigated. The 50% inhibitory doses of erythromycin for the inhibition of translation and 50S subunit assembly in Staphylococcus aureus cells were measured and were found to be identical. Together they account quantitatively for the observed effects of erythromycin on cell growth rates. There is also a direct relationship between the loss of rRNA from the 50S subunit and its accumulation as oligoribonucleotides in cells. The importance of this second site for erythromycin inhibition of bacterial cell growth is discussed.


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