5JSZ

Folate ECF transporter: apo state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.004 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.233 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural insight in the toppling mechanism of an energy-coupling factor transporter.

Swier, L.J.Guskov, A.Slotboom, D.J.

(2016) Nat Commun 7: 11072

  • DOI: 10.1038/ncomms11072
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Energy-coupling factor (ECF) transporters mediate uptake of micronutrients in prokaryotes. The transporters consist of an S-component that binds the transported substrate and an ECF module (EcfAA'T) that binds and hydrolyses ATP. The mechanism of tra ...

    Energy-coupling factor (ECF) transporters mediate uptake of micronutrients in prokaryotes. The transporters consist of an S-component that binds the transported substrate and an ECF module (EcfAA'T) that binds and hydrolyses ATP. The mechanism of transport is poorly understood but presumably involves an unusual step in which the membrane-embedded S-component topples over to carry the substrate across the membrane. In many ECF transporters, the S-component dissociates from the ECF module after transport. Subsequently, substrate-bound S-components out-compete the empty proteins for re-binding to the ECF module in a new round of transport. Here we present crystal structures of the folate-specific transporter ECF-FolT from Lactobacillus delbrueckii. Interaction of the ECF module with FolT stabilizes the toppled state, and simultaneously destroys the high-affinity folate-binding site, allowing substrate release into the cytosol. We hypothesize that differences in the kinetics of toppling can explain how substrate-loaded FolT out-competes apo-FolT for association with the ECF module.


    Organizational Affiliation

    Groningen Biomolecular Science and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Energy-coupling factor transporter ATP-binding protein EcfA1
A, E
300Lactobacillus delbrueckii subsp. bulgaricus (strain ATCC 11842 / DSM 20081 / JCM 1002 / NBRC 13953 / NCIMB 11778)Mutation(s): 0 
Gene Names: ecfA1 (cbiO1)
EC: 3.6.3.-
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
Group II energy-coupling factor (ECF) transporter for folate, substrate-bound S-component
Find proteins for Q1GBJ0 (Lactobacillus delbrueckii subsp. bulgaricus (strain ATCC 11842 / DSM 20081 / JCM 1002 / NBRC 13953 / NCIMB 11778))
Go to UniProtKB:  Q1GBJ0
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Energy-coupling factor transporter ATP-binding protein EcfA2
B, F
287Lactobacillus delbrueckii subsp. bulgaricus (strain ATCC 11842 / DSM 20081 / JCM 1002 / NBRC 13953 / NCIMB 11778)Mutation(s): 0 
Gene Names: ecfA2 (cbiO2)
EC: 3.6.3.-
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
Group II energy-coupling factor (ECF) transporter for folate, substrate-bound S-component
Find proteins for Q1GBI9 (Lactobacillus delbrueckii subsp. bulgaricus (strain ATCC 11842 / DSM 20081 / JCM 1002 / NBRC 13953 / NCIMB 11778))
Go to UniProtKB:  Q1GBI9
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Conserved hypothetical membrane protein
C, G
184Lactobacillus delbrueckii subsp. bulgaricus (strain ATCC 11842 / DSM 20081 / JCM 1002 / NBRC 13953 / NCIMB 11778)Mutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
Group II energy-coupling factor (ECF) transporter for folate, substrate-bound S-component
Find proteins for Q1G929 (Lactobacillus delbrueckii subsp. bulgaricus (strain ATCC 11842 / DSM 20081 / JCM 1002 / NBRC 13953 / NCIMB 11778))
Go to UniProtKB:  Q1G929
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Energy-coupling factor transporter transmembrane protein EcfT
D, H
265Lactobacillus delbrueckii subsp. bulgaricusMutation(s): 0 
Gene Names: ecfT
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
Group II energy-coupling factor (ECF) transporter for folate, substrate-bound S-component
Find proteins for A0A061BSU4 (Lactobacillus delbrueckii subsp. bulgaricus)
Go to UniProtKB:  A0A061BSU4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.004 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.233 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 88.820α = 83.45
b = 95.320β = 65.75
c = 107.570γ = 61.99
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
PHASERphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
ERCNetherlands282083

Revision History 

  • Version 1.0: 2016-05-18
    Type: Initial release