Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B 

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

Macromolecule Content

• Total Structure Weight: 47.41 kDa 
• Atom Count: 3604 
• Residue Count: 431 
• 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
• Organism(s): Mus musculus
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• 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/National Institute of General Medical Sciences (NIH/NIGMS), Howard Hughes Medical Institute (HHMI)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.62 Å
• R-Value Free: 0.198 
• R-Value Work: 0.178 
• R-Value Observed: 0.179 

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
• Structures With Same Primary Citation


• 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.

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Organizational Affiliation: 

Howard Hughes Medical Institute, Oregon Health &Science University, Portland, Oregon 97239, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
8B6 antibody, heavy chain	A	221	Mus musculus	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
8B6 antibody, light chain	B	214	Mus musculus	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.62 Å
• R-Value Free: 0.198 
• R-Value Work: 0.178 
• R-Value Observed: 0.179 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 81.56	α = 90
b = 81.56	β = 90
c = 142.17	γ = 90

Software Package:

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

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.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	--
Howard Hughes Medical Institute (HHMI)	United States	--

Revision History 

• 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: 2019-11-20
  Changes: Author supporting evidence, Database references, Derived calculations