Outer membrane protein OprM - Q51487 (OPRM_PSEAE)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q51487: 3
The outer membrane component of the MexAB-OprM efflux system that confers multidrug resistance. Also functions as the major efflux pump for n-hexane and p-xylene efflux. Over-expression of the pump increases antibiotic and solvent efflux capacities. Can replace the OprJ outer membrane component of the MexCD-OprJ pump; the antibiotics exported are those exported by the intact MexCD pump, showing that efflux substrate specificity is not conferred by this component. Serves as the outer membrane component for the MexXY efflux system. Implicated in the secretion of the siderophore pyoverdine. OprM is probably involved in the efflux of the siderophore across the outer membrane. UniProt
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Subunit Structure
Component of the MexAB-OprM multidrug efflux complex composed of an unknown number of MexA subunits, MexB and an OprM homotrimer. The OprM homotrimer assembles to form a 135 Angstroms-long pore. It consists of a beta-barrel, which is probably inserted in the outer membrane, and an alpha-barrel formed by alpha-helices which probably spans the periplasm. In the ground state the periplasmic end is closed, while the outer membrane end opening is 6-8 Angstroms in diameter. The OprM trimer is thought to contact the inner membrane MexB transporter. The MexA subunits are thought to form a barrel which allows substrates to pass directly from the cytoplasm to the external mileu. How the MexA subunits interact with OprM and MexB, and how the OprM channel is opened is unknown. UniProt
  • Other Gene names: oprM, oprK, PA0427
This protein in other organisms (by gene name):
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Data in green originates from UniProtKB  
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Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
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Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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