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- Title
Novobiocin binding to NalD induces the expression of the MexAB-OprM pump in Pseudomonas aeruginosa.
- Authors
Chen, Weizhong; Wang, Dan; Zhou, Wenquan; Sang, Hong; Liu, Xichun; Ge, Zhiyun; Zhang, Jin; Lan, Lefu; Yang, Cai‐Guang; Chen, Hao
- Abstract
NalD was reported to be the secondary repressor of the MexAB-OprM multidrug efflux pump, the major system contributing to intrinsic multidrug resistance in Pseudomonas aeruginosa. Here, we show that novobiocin binds directly to NalD, which leads NalD to dissociate from the DNA promoter, and thus de-represses the expression of the MexAB-OprM pump. In addition, we have solved the crystal structure of NalD at a resolution of 2.90 Å. The structural alignment of NalD to its homologue TtgR reveals that the residues N129 and H167 in NalD are involved in its novobiocin-binding ability. We have confirmed the function of these two amino acids by EMSA and plate assay. The results presented here highlight the importance and diversity of regulatory mechanism in bacterial antibiotic resistance, and provide further insight for novel antimicrobial development.
- Subjects
NOVOBIOCIN; MULTIDRUG resistance in bacteria; PSEUDOMONAS aeruginosa; PROMOTERS (Genetics); ANTI-infective agents
- Publication
Molecular Microbiology, 2016, Vol 100, Issue 5, p749
- ISSN
0950-382X
- Publication type
Article
- DOI
10.1111/mmi.13346