Nonoptimal microbial response to antibiotics underlies suppressive drug interactions.

Nonoptimal microbial response to antibiotics underlies suppressive drug interactions.
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DOI:
10.1016/j.cell.2009.10.025
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发表时间:
2009-11-13
期刊:
影响因子:
64.5
通讯作者:
Kishony R
Kishony R
中科院分区:
生物学1区
文献类型:
--
作者:
Bollenbach T;Quan S;Chait R;Kishony R

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Antibiotics inhibiting translation can increase bacterial growth rate in the presence of DNA synthesis inhibitors. Here, we show that this extreme type of drug antagonism, termed suppression, results from non-optimal regulation of ribosomal genes, leading to sub-maximal growth in the presence of DNA stress. Using GFP-tagged transcription reporters in Escherichia coli, we find that ribosomal genes are not directly regulated by DNA stress, leading to an imbalance between cellular DNA and protein content. Sequential deletion of up to 6 of the 7 ribosomal RNA operons corrects this imbalance and leads to improved survival and growth under DNA synthesis inhibition. Further, this genetic manipulation completely removes the suppressive drug interaction. Mathematical modeling shows that non-optimal regulation of ribosome synthesis under DNA stress can be explained as a side-effect of optimal growth-rate-dependent regulation in different nutrient environments. Together, these results reveal the genetic mechanism underlying an important class of suppressive drug interactions.
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