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2.A.6.2.21
The multidrug (aminoglycosides, β-lactams, fluoroquinolones, macrolides, chloramphenicol, tetracycline, erythromycin, ofloxacin, etc.) efflux pump, MexXY-OprM (Jeannot et al., 2005).  The 3-d structurre of OprM (also called OprK) is known (1WP1). RND-type xenobiotic transporters recognize hydrophobic substrates such as organic solvents by their periplasmic domains and expel them to the external milieu (Li et al. 2006). The MexXY multidrug exporter is frequently overexpressed in ciprofloxacin resistant cells (Serra et al. 2019). Increased expression or overexpression ofMexXY-OprM efflux pumps is the leading cause of carbapenem (imigenem; meropenem) resistance (Petrova et al. 2019).

Accession Number:Q51487
Protein Name:Outer membrane protein oprM [Precursor]
Length:485
Molecular Weight:52598.00
Species:Pseudomonas aeruginosa [287]
Location1 / Topology2 / Orientation3: Cell outer membrane1 / Lipid-anchor2
Substrate macrolide, fluoroquinolone antibiotic, ofloxacin, ciprofloxacin, chloramphenicol, beta-lactam, imipenem, tetracycline, amino cyclitol glycoside, erythromycin A, carbapenemcarboxylic acid

Cross database links:

RefSeq: NP_249118.1   
Entrez Gene ID: 877851   
Pfam: PF02321   
BioCyc: PAER208964:PA0427-MONOMER   
KEGG: pae:PA0427   

Gene Ontology

GO:0009279 C:cell outer membrane
GO:0016021 C:integral to membrane
GO:0005886 C:plasma membrane
GO:0008289 F:lipid binding
GO:0005215 F:transporter activity
GO:0046677 P:response to antibiotic
GO:0006810 P:transport

References (12)

[1] “Multiple antibiotic resistance in Pseudomonas aeruginosa: evidence for involvement of an efflux operon.”  Poole K.et.al.   8226684
[2] “Localization of the outer membrane subunit OprM of resistance-nodulation-cell division family multicomponent efflux pump in Pseudomonas aeruginosa.”  Nakajima A.et.al.   10889211
[3] “Complete genome sequence of Pseudomonas aeruginosa PAO1, an opportunistic pathogen.”  Stover C.K.et.al.   10984043
[4] “Cloning and sequence analysis of an EnvCD homologue in Pseudomonas aeruginosa: regulation by iron and possible involvement in the secretion of the siderophore pyoverdine.”  Poole K.et.al.   7968531
[5] “Global analysis of the membrane subproteome of Pseudomonas aeruginosa using liquid chromatography-tandem mass spectrometry.”  Blonder J.et.al.   15253424
[6] “Role of mexA-mexB-oprM in antibiotic efflux in Pseudomonas aeruginosa.”  Li X.-Z.et.al.   8540696
[7] “Inner membrane efflux components are responsible for beta-lactam specificity of multidrug efflux pumps in Pseudomonas aeruginosa.”  Srikumar R.et.al.   9401051
[8] “Role of the multidrug efflux systems of Pseudomonas aeruginosa in organic solvent tolerance.”  Li X.-Z.et.al.   9603892
[9] “Contribution of the MexX-MexY-oprM efflux system to intrinsic resistance in Pseudomonas aeruginosa.”  Masuda N.et.al.   10952562
[10] “Mutational analysis of the OprM outer membrane component of the MexA-MexB-OprM multidrug efflux system of Pseudomonas aeruginosa.”  Li X.-Z.et.al.   11114896
[11] “Crystal structure of the drug discharge outer membrane protein, OprM, of Pseudomonas aeruginosa: dual modes of membrane anchoring and occluded cavity end.”  Akama H.et.al.   15507433
[12] “Trimeric structure of OprN and OprM efflux proteins from Pseudomonas aeruginosa, by 2D electron crystallography.”  Lambert O.et.al.   15797729
Structure:
1WP1   3D5K   4Y1K   6IOK   6IOL   6TA5   6TA6     

External Searches:

Analyze:

Predict TMSs (Predict number of transmembrane segments)
Window Size: Angle:  
FASTA formatted sequence
1:	MKRSFLSLAV AAVVLSGCSL IPDYQRPEAP VAAAYPQGQA YGQNTGAAAV PAADIGWREF 
61:	FRDPQLQQLI GVALENNRDL RVAALNVEAF RAQYRIQRAD LFPRIGVDGS GTRQRLPGDL 
121:	STTGSPAISS QYGVTLGTTA WELDLFGRLR SLRDQALEQY LATEQAQRSA QTTLVASVAT 
181:	AYLTLKADQA QLQLTKDTLG TYQKSFDLTQ RSYDVGVASA LDLRQAQTAV EGARATLAQY 
241:	TRLVAQDQNA LVLLLGSGIP ANLPQGLGLD QTLLTEVPAG LPSDLLQRRP DILEAEHQLM 
301:	AANASIGAAR AAFFPSISLT ANAGTMSRQL SGLFDAGSGS WLFQPSINLP IFTAGSLRAS 
361:	LDYAKIQKDI NVAQYEKAIQ TAFQEVADGL AARGTFTEQL QAQRDLVKAS DEYYQLADKR 
421:	YRTGVDNYLT LLDAQRSLFT AQQQLITDRL NQLTSEVNLY KALGGGWNQQ TVTQQQTAKK 
481:	EDPQA