3B5D

EmrE multidrug transporter in complex with TPP, C2 crystal form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.8 Å
  • R-Value Free: 0.364 
  • R-Value Work: 0.325 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

X-ray structure of EmrE supports dual topology model.

Chen, Y.J.Pornillos, O.Lieu, S.Ma, C.Chen, A.P.Chang, G.

(2007) Proc.Natl.Acad.Sci.Usa 104: 18999-19004

  • DOI: 10.1073/pnas.0709387104
  • Primary Citation of Related Structures:  3B61, 3B62

  • PubMed Abstract: 
  • EmrE, a multidrug transporter from Escherichia coli, functions as a homodimer of a small four-transmembrane protein. The membrane insertion topology of the two monomers is controversial. Although the EmrE protein was reported to have a unique orienta ...

    EmrE, a multidrug transporter from Escherichia coli, functions as a homodimer of a small four-transmembrane protein. The membrane insertion topology of the two monomers is controversial. Although the EmrE protein was reported to have a unique orientation in the membrane, models based on electron microscopy and now defunct x-ray structures, as well as recent biochemical studies, posit an antiparallel dimer. We have now reanalyzed our x-ray data on EmrE. The corrected structures in complex with a transport substrate are highly similar to the electron microscopy structure. The first three transmembrane helices from each monomer surround the substrate binding chamber, whereas the fourth helices participate only in dimer formation. Selenomethionine markers clearly indicate an antiparallel orientation for the monomers, supporting a "dual topology" model.


    Organizational Affiliation

    Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, CB-105, La Jolla, CA 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Multidrug transporter emrE
A, B
110Escherichia coli (strain K12)Gene Names: emrE (eb, mvrC)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Multi-Drug Efflux Transporters
Protein: 
EmrE bacterial multi-drug efflux transporter with bound TPP substrate
Find proteins for P23895 (Escherichia coli (strain K12))
Go to UniProtKB:  P23895
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
P4P
Query on P4P

Download SDF File 
Download CCD File 
A
TETRAPHENYLPHOSPHONIUM
C24 H20 P
USFPINLPPFWTJW-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
P4PKi: 1300 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.8 Å
  • R-Value Free: 0.364 
  • R-Value Work: 0.325 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 115.100α = 90.00
b = 43.700β = 108.10
c = 76.400γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
HKL-2000data collection
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-10-25 
  • Released Date: 2007-12-04 
  • Deposition Author(s): Chang, G., Chen, Y.J.

Revision History 

  • Version 1.0: 2007-12-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance