Abstract
Resistance to d-cycloserine could be induced in Bacillus subtilis 168 by sublethal concentrations of d-cycloserine. Sensitivity to the antibiotic could be regained by growth in the absence of d-cycloserine. The bactericidal activity of d-cycloserine apparently was not altered by resistant cells, and peptidoglycan synthesis was still inhibited by d-cycloserine in resistant cells. The d-cycloserine resistance apparently resulted from a decreased uptake of the antibiotic. The decrease in d-cycloserine transport could be prevented by simultaneous treatment of the cells with rifampin and d-cycloserine. d-Cycloserine was transported by the same system as glycine in B. subtilis. d-Cycloserine was able to exchange for intracellular glycine in both sensitive and resistant cells, suggesting that d-cycloserine is not excluded from the cell in resistant cultures.
MeSH Terms
Bacillus subtilis/drug effects,growth & development,metabolism
Biological Transport, Active/drug effects
Cycloserine/metabolism,pharmacology
Drug Resistance, Microbial
Glycine/metabolism
Peptidoglycan/metabolism
Time Factors
Chemicals
Peptidoglycan
Cycloserine
Glycine
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Clark V L
Young F E
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