3F3A

Crystal Structure of LeuT bound to L-Tryptophan and Sodium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

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Ligand Structure Quality Assessment 


This is version 1.2 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:  
    3F48, 3F3A, 3F3C, 3F3D, 3F3E, 3F4I, 3F4J

  • 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 transport, the mechanism by which a substrate moves through the transporter, and principles of competitive inhibition remain unclear ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TransporterA519Aquifex aeolicusMutation(s): 0 
Gene Names: snfaq_2077
Membrane Entity: Yes 
UniProt
Find proteins for O67854 (Aquifex aeolicus (strain VF5))
Explore O67854 
Go to UniProtKB:  O67854
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BOG (Subject of Investigation/LOI)
Query on BOG

Download Ideal Coordinates CCD File 
F [auth A], G [auth A], H [auth A], I [auth A], J [auth A], K [auth A], M [auth A]octyl beta-D-glucopyranoside
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N
 Ligand Interaction
TRP (Subject of Investigation/LOI)
Query on TRP

Download Ideal Coordinates CCD File 
B [auth A], C [auth A], D [auth A], E [auth A]TRYPTOPHAN
C11 H12 N2 O2
QIVBCDIJIAJPQS-VIFPVBQESA-N
 Ligand Interaction
C14 (Subject of Investigation/LOI)
Query on C14

Download Ideal Coordinates CCD File 
L [auth A]TETRADECANE
C14 H30
BGHCVCJVXZWKCC-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
N [auth A], O [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
TRP Binding MOAD:  3F3A Ki: 6.48e+4 (nM) from 1 assay(s)
PDBBind:  3F3A Ki: 6.48e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.566α = 90
b = 85.218β = 93.33
c = 82.274γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
MOLREPphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-12-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Database references, Derived calculations, Structure summary