9M3Q | pdb_00009m3q

Cryo-EM structure of the spermidine-bound zTAAR13c-Gs complex

• PDB DOI: https://doi.org/10.2210/pdb9M3Q/pdb
• EM Map EMD-63606: EMDB EMDataResource

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens, Lama glama
• Expression System: Spodoptera frugiperda, Escherichia
• Mutation(s): No 


• Deposited: 2025-03-03 Released: 2026-03-11 
• Deposition Author(s): Zheng, Y., Zhao, S.W.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.74 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Molecular recognition of diamines by combinatorial coding of the zebrafish TAAR13 family

Zheng, Y., Zhao, S.W.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 5-mer - A1B1C1D1E1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 127.47 kDa 
• Atom Count: 8,455 
• Modeled Residue Count: 1,075 
• Deposited Residue Count: 1,138 
• Unique protein chains: 5

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Trace amine-associated receptor 13c	A [auth R]	341	Homo sapiens	Mutation(s): 0  Gene Names: taar13c
UniProt
Find proteins for Q5QNP2 (Danio rerio) Explore Q5QNP2  Go to UniProtKB:  Q5QNP2

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	B	340	Homo sapiens	Mutation(s): 0  Gene Names: GNB1
UniProt & NIH Common Fund Data Resources
Find proteins for P62873 (Homo sapiens) Explore P62873  Go to UniProtKB:  P62873
PHAROS:  P62873 GTEx:  ENSG00000078369

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	C	71	Homo sapiens	Mutation(s): 0  Gene Names: GNG2
UniProt & NIH Common Fund Data Resources
Find proteins for P59768 (Homo sapiens) Explore P59768  Go to UniProtKB:  P59768
PHAROS:  P59768 GTEx:  ENSG00000186469

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Nb35	D [auth N]	139	Lama glama	Mutation(s): 0

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(s) subunit alpha isoforms short	E [auth A]	247	Homo sapiens	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SPD (Subject of Investigation/LOI)	F [auth R]	SPERMIDINE C7 H19 N3 ATHGHQPFGPMSJY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.74 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.19_4092

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-03-11 
Deposition Author(s): Zheng, Y., Zhao, S.W.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	2022YFA1302900

Revision History  

• Version 1.0: 2026-03-11
  Type: Initial release