3F3A

Crystal Structure of LeuT bound to L-Tryptophan and Sodium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A competitive inhibitor traps LeuT in an open-to-out conformation.

Singh, S.K.Piscitelli, C.L.Yamashita, A.Gouaux, E.

(2008) Science 322: 1655-1661

  • DOI: 10.1126/science.1166777
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Secondary transporters are workhorses of cellular membranes, catalyzing the movement of small molecules and ions across the bilayer and coupling substrate passage to ion gradients. However, the conformational changes that accompany substrate transpor ...

    Secondary transporters are workhorses of cellular membranes, catalyzing the movement of small molecules and ions across the bilayer and coupling substrate passage to ion gradients. However, the conformational changes that accompany substrate transport, the mechanism by which a substrate moves through the transporter, and principles of competitive inhibition remain unclear. We used crystallographic and functional studies on the leucine transporter (LeuT), a model for neurotransmitter sodium symporters, to show that various amino acid substrates induce the same occluded conformational state and that a competitive inhibitor, tryptophan (Trp), traps LeuT in an open-to-out conformation. In the Trp complex, the extracellular gate residues arginine 30 and aspartic acid 404 define a second weak binding site for substrates or inhibitors as they permeate from the extracellular solution to the primary substrate site, which demonstrates how residues that participate in gating also mediate permeation.


    Organizational Affiliation

    Vollum Institute, Oregon Health and Science University, 3181 Southwest Sam Jackson Park Road, Portland, OR 97239, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transporter
A
519Aquifex aeolicus (strain VF5)Mutation(s): 0 
Gene Names: snf
Membrane protein
mpstruc
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 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
C14
Query on C14

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Download CCD File 
A
TETRADECANE
C14 H30
BGHCVCJVXZWKCC-UHFFFAOYSA-N
 Ligand Interaction
TRP
Query on TRP

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Download CCD File 
A
TRYPTOPHAN
C11 H12 N2 O2
QIVBCDIJIAJPQS-VIFPVBQESA-N
 Ligand Interaction
BOG
Query on BOG

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Download CCD File 
A
B-OCTYLGLUCOSIDE
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
TRPKi: 64800 nM BINDINGMOAD
TRPKi: 64800 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.198 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 88.566α = 90.00
b = 85.218β = 93.33
c = 82.274γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
MOLREPphasing
PHENIXrefinement
ADSCdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-12-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance