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- EMDB-71770: Structure of human serotonin transporter bound to small molecule ... -

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Basic information

Entry
Database: EMDB / ID: EMD-71770
TitleStructure of human serotonin transporter bound to small molecule zPZd in lipid nanodisc and NaCl
Map data
Sample
  • Complex: Human serotonin transporter in complex with Fab15B8 bound to zPZd in NaCl
    • Protein or peptide: Sodium-dependent serotonin transporter
    • Protein or peptide: 15B8 Fab heavy chain
    • Protein or peptide: 15B8 Fab light chain
  • Ligand: CHLORIDE ION
  • Ligand: (6M)-1-methyl-6-(1,2,5,6-tetrahydropyridin-3-yl)-1H-indole
KeywordsNeurotransmitter Transporter / Inhibitor / Complex / TRANSPORT PROTEIN-IMMUNE SYSTEM-INHIBITOR complex
Function / homology
Function and homology information


negative regulation of cerebellar granule cell precursor proliferation / regulation of thalamus size / Serotonin clearance from the synaptic cleft / serotonergic synapse / positive regulation of serotonin secretion / negative regulation of synaptic transmission, dopaminergic / cocaine binding / serotonin:sodium:chloride symporter activity / cellular response to cGMP / enteric nervous system development ...negative regulation of cerebellar granule cell precursor proliferation / regulation of thalamus size / Serotonin clearance from the synaptic cleft / serotonergic synapse / positive regulation of serotonin secretion / negative regulation of synaptic transmission, dopaminergic / cocaine binding / serotonin:sodium:chloride symporter activity / cellular response to cGMP / enteric nervous system development / negative regulation of organ growth / sodium ion binding / serotonin uptake / neurotransmitter transmembrane transporter activity / vasoconstriction / monoamine transmembrane transporter activity / monoamine transport / serotonin binding / brain morphogenesis / syntaxin-1 binding / antiporter activity / negative regulation of neuron differentiation / male mating behavior / neurotransmitter transport / nitric-oxide synthase binding / amino acid transport / membrane depolarization / conditioned place preference / monoatomic cation channel activity / behavioral response to cocaine / cellular response to retinoic acid / positive regulation of cell cycle / endomembrane system / response to nutrient / sodium ion transmembrane transport / circadian rhythm / platelet aggregation / integrin binding / response to toxic substance / memory / actin filament binding / response to estradiol / presynaptic membrane / response to hypoxia / postsynaptic membrane / endosome membrane / neuron projection / membrane raft / response to xenobiotic stimulus / focal adhesion / synapse / positive regulation of gene expression / identical protein binding / plasma membrane
Similarity search - Function
Sodium:neurotransmitter symporter, serotonin, N-terminal / Serotonin (5-HT) neurotransmitter transporter, N-terminus / Sodium:neurotransmitter symporter family signature 2. / Sodium:neurotransmitter symporter family signature 1. / Sodium:neurotransmitter symporter / Sodium:neurotransmitter symporter superfamily / Sodium:neurotransmitter symporter family / Sodium:neurotransmitter symporter family profile.
Similarity search - Domain/homology
Sodium-dependent serotonin transporter
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsBillesboelle CB / Manglik A
Funding support United States, 1 items
OrganizationGrant numberCountry
Defense Advanced Research Projects Agency (DARPA)HR0011-19-2-0020 United States
CitationJournal: J Med Chem / Year: 2026
Title: Large Library Docking for Polypharmacology.
Authors: Yujin Wu / Seth Vigneron / Joao Braz / Karthik Srinivasan / Elissa A Fink / Xi-Ping Huang / Xinyu Xu / Harald Huebner / Joseph Y Kim / Jing Wang / Tara Pfeiffer / Kensuke Sakamoto / Dmytro S ...Authors: Yujin Wu / Seth Vigneron / Joao Braz / Karthik Srinivasan / Elissa A Fink / Xi-Ping Huang / Xinyu Xu / Harald Huebner / Joseph Y Kim / Jing Wang / Tara Pfeiffer / Kensuke Sakamoto / Dmytro S Radchenko / Ramona M Rodriguiz / Yurii S Moroz / John J Irwin / Peter Gmeiner / Christian Billesboelle / Bryan L Roth / Allan I Basbaum / Aashish Manglik / William C Wetsel / Brian K Shoichet /
Abstract: Polypharmacological molecules are attractive for complex illnesses. Here, we explored large library docking for joint activity against target pairs. Retrospectively, as libraries grew, so too did the ...Polypharmacological molecules are attractive for complex illnesses. Here, we explored large library docking for joint activity against target pairs. Retrospectively, as libraries grew, so too did the number of likely dual-activity molecules. In prospective docking of a 900-million molecule library against three target pairs (α/SERT, MOR/SERT, and α/MOR), we sought analgesic compounds. Both the α/SERT and SERT/MOR campaigns led to dual binders with low μM to high nM activities with high hit rates; tetrahydropyridines from the α/SERT campaign were also active against 5-HT. However, even though cryo-EM structures confirmed the docking-predicted poses, optimization struggled to improve potency. Still, in mouse behavioral assays, the most potent α/SERT compound (') was effective against pain without inducing conditioned place preference, and the molecule had potent antidepression and anxiolytic drug-like behavior, consistent with its SERT/5-HT activities. This study reveals both advantages and challenges of docking for polypharmacology.
History
DepositionJul 21, 2025-
Header (metadata) releaseMar 4, 2026-
Map releaseMar 4, 2026-
UpdateMar 4, 2026-
Current statusMar 4, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_71770.png

Downloads & links

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Map

FileDownload / File: emd_71770.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.82 Å/pix.
x 360 pix.
= 294.804 Å		0.82 Å/pix.
x 360 pix.
= 294.804 Å		0.82 Å/pix.
x 360 pix.
= 294.804 Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.8189 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.517
Minimum - Maximum-1.575981 - 2.510554
Average (Standard dev.)0.0011325201 (±0.06784294)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 294.804 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_71770_half_map_1.map
Projections & Slices
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Histogram (log scale)

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Half map: #2

Fileemd_71770_half_map_2.map
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Sample components

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Entire : Human serotonin transporter in complex with Fab15B8 bound to zPZd...

EntireName: Human serotonin transporter in complex with Fab15B8 bound to zPZd in NaCl
Components
  • Complex: Human serotonin transporter in complex with Fab15B8 bound to zPZd in NaCl
    • Protein or peptide: Sodium-dependent serotonin transporter
    • Protein or peptide: 15B8 Fab heavy chain
    • Protein or peptide: 15B8 Fab light chain
  • Ligand: CHLORIDE ION
  • Ligand: (6M)-1-methyl-6-(1,2,5,6-tetrahydropyridin-3-yl)-1H-indole

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Supramolecule #1: Human serotonin transporter in complex with Fab15B8 bound to zPZd...

SupramoleculeName: Human serotonin transporter in complex with Fab15B8 bound to zPZd in NaCl
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Sodium-dependent serotonin transporter

MacromoleculeName: Sodium-dependent serotonin transporter / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 61.062129 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: GERETWGKKV DFLLSVIGYA VDLGNVWRFP YICYQNGGGA FLLPYTIMAI FGGIPLFYME LALGQYHRNG CISIWRKICP IFKGIGYAI CIIAFYIASY YNTIMAWALY YLISSFTDQL PWTSCKNSWN TGNCTNYFSE DNITWTLHST SPAEEFYTRH V LQIHRSKG ...String:
GERETWGKKV DFLLSVIGYA VDLGNVWRFP YICYQNGGGA FLLPYTIMAI FGGIPLFYME LALGQYHRNG CISIWRKICP IFKGIGYAI CIIAFYIASY YNTIMAWALY YLISSFTDQL PWTSCKNSWN TGNCTNYFSE DNITWTLHST SPAEEFYTRH V LQIHRSKG LQDLGGISWQ LALCIMLIFT VIYFSIWKGV KTSGKVVWVT ATFPYIILSV LLVRGATLPG AWRGVLFYLK PN WQKLLET GVWIDAAAQI FFSLGPGFGV LLAFASYNKF NNNCYQDALV TSVVNCMTSF VSGFVIFTVL GYMAEMRNED VSE VAKDAG PSLLFITYAE AIANMPASTF FAIIFFLMLI TLGLDSTFAG LEGVITAVLD EFPHVWAKRR ERFVLAVVIT CFFG SLVTL TFGGAYVVKL LEEYATGPAV LTVALIEAVA VSWFYGITQF CRDVKEMLGF SPGWFWRICW VAISPLFLLF IICSF LMSP PQLRLFQYNY PYWSIILGYC IGTSSFICIP TYIAYRLIIT PGTFKERIIK SITPETP

UniProtKB: Sodium-dependent serotonin transporter

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Macromolecule #2: 15B8 Fab heavy chain

MacromoleculeName: 15B8 Fab heavy chain / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 13.166742 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString:
QVQLQQSGPE LVKLGASVRI SCKASGYRFS YSWMNWVKQR PGKGLEWIGR IYPGDGDTKY SGKFKGKATL TADKSSSTVY MQLSSLTSE DSAVYFCARS AYGSEGFAMD YWGQGTSVTV S

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Macromolecule #3: 15B8 Fab light chain

MacromoleculeName: 15B8 Fab light chain / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 11.905246 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString:
DIVLTQSPAS LAVSLGQRAT ISCRASESVD NYGISFLNWF QQKPGQPPKL LIYAASNQGS GVPARFSGSG SGTYFSLNIH PMEEDDTAV YFCQQTKGVS WTFGGGTKVE IK

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Macromolecule #4: CHLORIDE ION

MacromoleculeName: CHLORIDE ION / type: ligand / ID: 4 / Number of copies: 1 / Formula: CL
Molecular weightTheoretical: 35.453 Da

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Macromolecule #5: (6M)-1-methyl-6-(1,2,5,6-tetrahydropyridin-3-yl)-1H-indole

MacromoleculeName: (6M)-1-methyl-6-(1,2,5,6-tetrahydropyridin-3-yl)-1H-indole
type: ligand / ID: 5 / Number of copies: 1 / Formula: A1CIZ
Molecular weightTheoretical: 212.29 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
GridModel: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 47.7 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.1 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: cryoSPARC (ver. 4.5.3) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.5.3) / Number images used: 9815
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.5.3)
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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