9UCP | pdb_00009ucp

cryo-EM structure of M1 muscarinic acetylcholine receptor-alpha5 helix of G11 protein complex bound to iperoxo and nanobody Nb1B4

• PDB DOI: https://doi.org/10.2210/pdb9UCP/pdb
• EM Map EMD-64050: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN/IMMUNE SYSTEM
• Organism(s): Homo sapiens, Vicugna pacos
• Expression System: Spodoptera frugiperda, Homo sapiens
• Mutation(s): No 


• Deposited: 2025-04-05 Released: 2025-10-29 
• Deposition Author(s): Zhang, X., Gao, K., Liu, X.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.88 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

cryo-EM structure of M1 muscarinic acetylcholine receptor-alpha5 helix of G11 protein complex bound to iperoxo and nanobody Nb1B4

Zhang, X., Gao, K., Liu, X.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

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

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 66.43 kDa 
• Atom Count: 3,529 
• Modeled Residue Count: 511 
• Deposited Residue Count: 584 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
M1 muscarinic acetylcholine receptor, de novo design protein	A	435	Homo sapiens	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein subunit alpha-11	B	27	Homo sapiens	Mutation(s): 0  Gene Names: GNA11, GA11 EC: 3.6.5
UniProt & NIH Common Fund Data Resources
Find proteins for P29992 (Homo sapiens) Explore P29992  Go to UniProtKB:  P29992
PHAROS:  P29992 GTEx:  ENSG00000088256

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Nanobody Nb1B4	C	122	Vicugna pacos	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IXO (Subject of Investigation/LOI)	D [auth A]	4-(4,5-dihydro-1,2-oxazol-3-yloxy)-N,N,N-trimethylbut-2-yn-1-aminium C10 H17 N2 O2 WXXOCGISBCTWPW-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.88 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-10-29 
Deposition Author(s): Zhang, X., Gao, K., Liu, X.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	32122041

Revision History  

• Version 1.0: 2025-10-29
  Type: Initial release