Gene cloning and characteristics of the RND-type multidrug efflux pump MuxABC-OpmB possessing two RND components in Pseudomonas aeruginosa

Takehiko Mima, Naoki Kohira, Yang Li, Hiroshi Sekiya, Wakano Ogawa, Teruo Kuroda, Tomofusa Tsuchiya

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

muxA-muxB-muxC-opmB (formerly PA2528-PA2527-PA2526-opmB), encoding a putative resistance nodulation cell division (RND)-type multidrug efflux pump system, was cloned from Pseudomonas aeruginosa PAO1. Introduction of muxABC-opmB into P. aeruginosa YM64, a drug-hypersusceptible strain, led to elevated MICs of aztreonam, macrolides, novobiocin and tetracycline. Since muxB and muxC, both of which encode RND components, were essential for function, MuxABC-OpmB is thought to be a drug efflux pump with four components. One novobiocin-resistant mutant, PMX725, isolated from P. aeruginosa PMX7 showed elevated resistance not only to novobiocin but also to aztreonam, macrolides and tetracycline. Increased mRNA expression of muxABC-opmB was observed in the mutant PMX725 compared with the parental strain. Sequencing analysis revealed that a single-nucleotide insertion had occurred in the deduced promoter region for muxABC-opmB in PMX725. In this study, we have characterized the last RND-type multidrug efflux pump predicted from the genome sequence in P. aeruginosa.

Original languageEnglish
Pages (from-to)3509-3517
Number of pages9
JournalMicrobiology
Volume155
Issue number11
DOIs
Publication statusPublished - 2009

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Cellular Structures
Novobiocin
Cell Division
Pseudomonas aeruginosa
Organism Cloning
Aztreonam
Macrolides
Tetracycline
Genes
Genetic Promoter Regions
Pharmaceutical Preparations
Nucleotides
Genome
Messenger RNA

ASJC Scopus subject areas

  • Microbiology

Cite this

Gene cloning and characteristics of the RND-type multidrug efflux pump MuxABC-OpmB possessing two RND components in Pseudomonas aeruginosa. / Mima, Takehiko; Kohira, Naoki; Li, Yang; Sekiya, Hiroshi; Ogawa, Wakano; Kuroda, Teruo; Tsuchiya, Tomofusa.

In: Microbiology, Vol. 155, No. 11, 2009, p. 3509-3517.

Research output: Contribution to journalArticle

Mima, Takehiko ; Kohira, Naoki ; Li, Yang ; Sekiya, Hiroshi ; Ogawa, Wakano ; Kuroda, Teruo ; Tsuchiya, Tomofusa. / Gene cloning and characteristics of the RND-type multidrug efflux pump MuxABC-OpmB possessing two RND components in Pseudomonas aeruginosa. In: Microbiology. 2009 ; Vol. 155, No. 11. pp. 3509-3517.
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