Biological Assembly 1  

 3D View: Structure | Electron Density

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 47406.58 
• Atom Count: 3302 
• Residue Count: 435 
• Unique protein chains: 2

5I66

X-ray structure of the Fab fragment of 8B6, a murine monoclonal antibody specific for the human serotonin transporter

• DOI: 10.2210/pdb5I66/pdb

• Classification: IMMUNE SYSTEM
• Expression System: Spodoptera frugiperda


• Deposited: 2016-02-16 Released: 2016-04-13 
• Deposition Author(s): Coleman, J.A., Green, E.M., Gouaux, E.
• Funding Organization(s): National Institutes of Health; Howard Hughes Medical Institute 

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.624 Å
• R-Value Free: 0.198 
• R-Value Work: 0.178 

Literature

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

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

(2016) Nature 532: 334-339

• PubMed: 27049939 
• DOI: 10.1038/nature17629
• Primary Citation of Related Structures:  
  5I75, 5I74, 5I73, 5I71, 5I6Z, 5I6X


• 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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
8B6 antibody, heavy chain	A	221	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
8B6 antibody, light chain	B	214	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.624 Å
• R-Value Free: 0.198 
• R-Value Work: 0.178 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 81.560	α = 90.00
b = 81.560	β = 90.00
c = 142.170	γ = 90.00

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2016-02-16 
• Released Date: 2016-04-13 
• Deposition Author(s): Coleman, J.A., Green, E.M., Gouaux, E.

---

Funding Organization	Location	Grant Number
National Institutes of Health	United States	--
Howard Hughes Medical Institute	United States	--

Revision History 

• Version 1.0: 2016-04-13
  Type: Initial release
• Version 1.1: 2016-04-20
  Type: Database references
• Version 1.2: 2016-05-04
  Type: Database references