Accession ARO:3000386
DefinitionMexAB-OprM is a multidrug efflux protein expressed in the Gram-negative Pseudomonas aeruginosa. MexA is the membrane fusion protein; MexB is the inner membrane transporter; and OprM is the outer membrane channel. MexAB-OprM is associated with resistance to fluoroquinolones, chloramphenicol, erythromycin, azithromycin, novobiocin, and certain β-lactams and lastly over-expression is linked to colistin resistance.
AMR Gene Familyresistance-nodulation-cell division (RND) antibiotic efflux pump
Drug Classpeptide antibiotic, sulfonamide antibiotic, diaminopyrimidine antibiotic, aminocoumarin antibiotic, tetracycline antibiotic, macrolide antibiotic, phenicol antibiotic, cephalosporin, carbapenem, penam, fluoroquinolone antibiotic, monobactam, cephamycin, penem
Resistance Mechanismantibiotic efflux
Efflux Componentefflux pump complex or subunit conferring antibiotic resistance
Classification26 ontology terms | Show
Parent Term(s)24 ontology terms | Show
+ resistance-nodulation-cell division (RND) antibiotic efflux pump [AMR Gene Family]
+ confers_resistance_to_antibiotic tetracycline [Antibiotic]
+ confers_resistance_to_antibiotic ciprofloxacin [Antibiotic]
+ confers_resistance_to_antibiotic chloramphenicol [Antibiotic]
+ confers_resistance_to_antibiotic erythromycin [Antibiotic]
+ confers_resistance_to_antibiotic azithromycin [Antibiotic]
+ confers_resistance_to_antibiotic novobiocin [Antibiotic]
+ confers_resistance_to_antibiotic colistin B [Antibiotic]
+ confers_resistance_to_antibiotic aztreonam [Antibiotic]
+ confers_resistance_to_antibiotic meropenem [Antibiotic]
+ confers_resistance_to_antibiotic panipenem [Antibiotic]
+ confers_resistance_to_drug_class fluoroquinolone antibiotic [Drug Class]
+ confers_resistance_to_antibiotic colistin A [Antibiotic]
+ confers_resistance_to_drug_class macrolide antibiotic [Drug Class]
+ confers_resistance_to_antibiotic ampicillin [Antibiotic]
+ confers_resistance_to_antibiotic ceftriaxone [Antibiotic]
+ confers_resistance_to_antibiotic trimethoprim-sulfamethoxazole [Antibiotic]
+ confers_resistance_to_antibiotic ceftazidime [Antibiotic]
+ confers_resistance_to_drug_class penam [Drug Class]
+ confers_resistance_to_drug_class cephalosporin [Drug Class]
+ confers_resistance_to_drug_class cephamycin [Drug Class]
+ confers_resistance_to_antibiotic trimethoprim [Antibiotic]
+ confers_resistance_to_drug_class sulfonamide antibiotic [Drug Class]
+ confers_resistance_to_drug_class penem [Drug Class]
13 ontology terms | Show

Srikumar R, et al. 1998. Antimicrob Agents Chemother 42(1): 65-71. Expression of Pseudomonas aeruginosa multidrug efflux pumps MexA-MexB-OprM and MexC-MexD-OprJ in a multidrug-sensitive Escherichia coli strain. (PMID 9449262)

Nehme D and Poole K. 2007. J Bacteriol 189(17): 6118-6127. Assembly of the MexAB-OprM multidrug pump of Pseudomonas aeruginosa: component interactions defined by the study of pump mutant suppressors. (PMID 17586626)

Nehme D and Poole K. 2005. Antimicrob Agents Chemother 49(10): 4375-4378. Interaction of the MexA and MexB components of the MexAB-OprM multidrug efflux system of Pseudomonas aeruginosa: identification of MexA extragenic suppressors of a T578I mutation in MexB. (PMID 16189126)

Sugimura M, et al. 2008. Antimicrob Agents Chemother 52(11): 4141-4144. Macrolide antibiotic-mediated downregulation of MexAB-OprM efflux pump expression in Pseudomonas aeruginosa. (PMID 18676884)

Pamp SJ, et al. 2008. Mol Microbiol 68(1): 223-240. Tolerance to the antimicrobial peptide colistin in Pseudomonas aeruginosa biofilms is linked to metabolically active cells, and depends on the pmr and mexAB-oprM genes. (PMID 18312276)