5I6X

X-ray structure of the ts3 human serotonin transporter complexed with paroxetine at the central site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.14 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.240 

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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

X-ray structures and mechanism of the human serotonin transporter.

Coleman, J.A.Green, E.M.Gouaux, E.

(2016) Nature 532: 334-339

  • DOI: https://doi.org/10.1038/nature17629
  • Primary Citation of Related Structures:  
    5I66, 5I6X, 5I6Z, 5I71, 5I73, 5I74, 5I75

  • PubMed Abstract: 

    The serotonin transporter (SERT) terminates serotonergic signalling through the sodium- and chloride-dependent reuptake of neurotransmitter into presynaptic neurons. SERT is a target for antidepressant and psychostimulant drugs, which block reuptake and prolong neurotransmitter signalling. Here we report X-ray crystallographic structures of human SERT at 3.15 Å resolution bound to the antidepressants (S)-citalopram or paroxetine. Antidepressants lock SERT in an outward-open conformation by lodging in the central binding site, located between transmembrane helices 1, 3, 6, 8 and 10, directly blocking serotonin binding. We further identify the location of an allosteric site in the complex as residing at the periphery of the extracellular vestibule, interposed between extracellular loops 4 and 6 and transmembrane helices 1, 6, 10 and 11. Occupancy of the allosteric site sterically hinders ligand unbinding from the central site, providing an explanation for the action of (S)-citalopram as an allosteric ligand. These structures define the mechanism of antidepressant action in SERT, and provide blueprints for future drug design.


  • Organizational Affiliation

    Vollum Institute, Oregon Health &Science University, Portland, Oregon 97239, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sodium-dependent serotonin transporter549Homo sapiensMutation(s): 4 
Gene Names: SLC6A4HTTSERT
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P31645 (Homo sapiens)
Explore P31645 
Go to UniProtKB:  P31645
PHAROS:  P31645
GTEx:  ENSG00000108576 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP31645
Glycosylation
Glycosylation Sites: 2Go to GlyGen: P31645-1
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
8B6 antibody, heavy chain221Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
8B6 antibody, light chain214Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LMT
Query on LMT

Download Ideal Coordinates CCD File 
F [auth A]DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
CLR
Query on CLR

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E [auth A]CHOLESTEROL
C27 H46 O
HVYWMOMLDIMFJA-DPAQBDIFSA-N
8PR
Query on 8PR

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H [auth A]Paroxetine
C19 H20 F N O3
AHOUBRCZNHFOSL-YOEHRIQHSA-N
NAG
Query on NAG

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D [auth A],
G [auth A]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
CL
Query on CL

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I [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA
Query on NA

Download Ideal Coordinates CCD File 
J [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
8PR BindingDB:  5I6X Ki: min: 0.02, max: 4.7 (nM) from 24 assay(s)
Kd: min: 0.13, max: 0.15 (nM) from 2 assay(s)
IC50: min: 0.2, max: 6.43 (nM) from 5 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.14 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.240 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.15α = 90
b = 162.83β = 90
c = 140.41γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-04-13
    Type: Initial release
  • Version 1.1: 2016-04-20
    Changes: Database references
  • Version 1.2: 2016-05-04
    Changes: Database references
  • Version 1.3: 2020-03-04
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary