4HZU

Structure of a bacterial energy-coupling factor transporter


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.53 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.241 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of a bacterial energy-coupling factor transporter.

Wang, T.Fu, G.Pan, X.Wu, J.Gong, X.Wang, J.Shi, Y.

(2013) Nature 497: 272-276

  • DOI: 10.1038/nature12045

  • PubMed Abstract: 
  • The energy-coupling factor (ECF) transporters constitute a novel family of conserved membrane transporters in prokaryotes that have a similar domain organization to the ATP-binding cassette transporters. Each ECF transporter comprises a pair of cytos ...

    The energy-coupling factor (ECF) transporters constitute a novel family of conserved membrane transporters in prokaryotes that have a similar domain organization to the ATP-binding cassette transporters. Each ECF transporter comprises a pair of cytosolic ATPases (the A and A' components, or EcfA and EcfA'), a membrane-embedded substrate-binding protein (the S component, or EcfS) and a transmembrane energy-coupling component (the T component, or EcfT) that links the EcfA-EcfA' subcomplex to EcfS. The structure and transport mechanism of the quaternary ECF transporter remain largely unknown. Here we report the crystal structure of a nucleotide-free ECF transporter from Lactobacillus brevis at a resolution of 3.5 Å. The T component has a horseshoe-shaped open architecture, with five α-helices as transmembrane segments and two cytoplasmic α-helices as coupling modules connecting to the A and A' components. Strikingly, the S component, thought to be specific for hydroxymethyl pyrimidine, lies horizontally along the lipid membrane and is bound exclusively by the five transmembrane segments and the two cytoplasmic helices of the T component. These structural features suggest a plausible working model for the transport cycle of the ECF transporters.


    Organizational Affiliation

    Ministry of Education Key Laboratory of Protein Science, Tsinghua University, Beijing 100084, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Energy-coupling factor transporter ATP-binding protein EcfA 1
B
290Lactobacillus brevis (strain ATCC 367 / JCM 1170)Gene Names: ecfA2 (cbiO2)
EC: 3.6.3.-
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Energy-Coupling Factor (ECF) Transporters
Protein: 
Folate ECF transporter complex
Find proteins for Q03PY6 (Lactobacillus brevis (strain ATCC 367 / JCM 1170))
Go to UniProtKB:  Q03PY6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Energy-coupling factor transporter ATP-binding protein EcfA 2
A
279Lactobacillus brevis (strain ATCC 367 / JCM 1170)Gene Names: ecfA1 (cbiO1)
EC: 3.6.3.-
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Energy-Coupling Factor (ECF) Transporters
Protein: 
Folate ECF transporter complex
Find proteins for Q03PY5 (Lactobacillus brevis (strain ATCC 367 / JCM 1170))
Go to UniProtKB:  Q03PY5
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Energy-coupling factor transporter transmembrane protein EcfT
T
266Lactobacillus brevis (strain ATCC 367 / JCM 1170)Gene Names: ecfT
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Energy-Coupling Factor (ECF) Transporters
Protein: 
Folate ECF transporter complex
Find proteins for Q03PY7 (Lactobacillus brevis (strain ATCC 367 / JCM 1170))
Go to UniProtKB:  Q03PY7
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Predicted membrane protein
S
166Lactobacillus brevis (strain ATCC 367 / JCM 1170)N/A
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Energy-Coupling Factor (ECF) Transporters
Protein: 
Folate ECF transporter complex
Find proteins for Q03NM0 (Lactobacillus brevis (strain ATCC 367 / JCM 1170))
Go to UniProtKB:  Q03NM0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.53 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.241 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 79.971α = 90.00
b = 148.690β = 90.00
c = 154.574γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
DENZOdata reduction
ADSCdata collection
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-17
    Type: Initial release
  • Version 1.1: 2013-05-22
    Type: Database references