5JAE

LeuT in the outward-oriented, Na+-free return state, P21 form at pH 6.5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

A conserved leucine occupies the empty substrate site of LeuT in the Na(+)-free return state.

Malinauskaite, L.Said, S.Sahin, C.Grouleff, J.Shahsavar, A.Bjerregaard, H.Noer, P.Severinsen, K.Boesen, T.Schitt, B.Sinning, S.Nissen, P.

(2016) Nat Commun 7: 11673-11673

  • DOI: 10.1038/ncomms11673
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Bacterial members of the neurotransmitter:sodium symporter (NSS) family perform Na(+)-dependent amino-acid uptake and extrude H(+) in return. Previous NSS structures represent intermediates of Na(+)/substrate binding or intracellular release, but not ...

    Bacterial members of the neurotransmitter:sodium symporter (NSS) family perform Na(+)-dependent amino-acid uptake and extrude H(+) in return. Previous NSS structures represent intermediates of Na(+)/substrate binding or intracellular release, but not the inward-to-outward return transition. Here we report crystal structures of Aquifex aeolicus LeuT in an outward-oriented, Na(+)- and substrate-free state likely to be H(+)-occluded. We find a remarkable rotation of the conserved Leu25 into the empty substrate-binding pocket and rearrangements of the empty Na(+) sites. Mutational studies of the equivalent Leu99 in the human serotonin transporter show a critical role of this residue on the transport rate. Molecular dynamics simulations show that extracellular Na(+) is blocked unless Leu25 is rotated out of the substrate-binding pocket. We propose that Leu25 facilitates the inward-to-outward transition by compensating a Na(+)- and substrate-free state and acts as the gatekeeper for Na(+) binding that prevents leak in inward-outward return transitions.


    Organizational Affiliation

    Danish Research Institute of Translational Neuroscience-DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, Department of Molecular Biology and Genetics, Aarhus University, Gustav Wieds Vej 10C, Aarhus C DK-8000, Denmark.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transporter
A, B
519Aquifex aeolicus (strain VF5)Mutation(s): 0 
Gene Names: snf
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Amino Acid Secondary Transporters
Protein: 
LeuTAa Leucine transporter
Find proteins for O67854 (Aquifex aeolicus (strain VF5))
Go to UniProtKB:  O67854
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BOG
Query on BOG

Download SDF File 
Download CCD File 
A, B
B-OCTYLGLUCOSIDE
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.223 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 81.570α = 90.00
b = 92.080β = 95.18
c = 92.470γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
XDSdata reduction
PHENIXphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Lundbeck FoundationDenmark2012-12576

Revision History 

  • Version 1.0: 2016-06-01
    Type: Initial release