8W8W | pdb_00008w8w

Cryo-EM structure of alpha-MSH-MC3R-Gs_Nb35 complex

• PDB DOI: https://doi.org/10.2210/pdb8W8W/pdb
• EM Map EMD-37359: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Escherichia coli, Homo sapiens, Rattus norvegicus, Bos taurus, Lama glama
• Expression System: Spodoptera frugiperda, Eschenbachia
• Mutation(s): No 
• Membrane Protein: Yes  PDBTMMemProtMD


• Deposited: 2023-09-04 Released: 2025-03-19 
• Deposition Author(s): Chen, Q., Fu, J.
• Funding Organization(s): Other government, Other private

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.90 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structure basis of ligand selectivity and signal transduction in human melanocortin-3 receptor

Jingpeng, F., Hongli, H.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 6-mer - A1B1C1D1E1F1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 179.99 kDa 
• Atom Count: 7,642 
• Modeled Residue Count: 979 
• Deposited Residue Count: 1,610 
• Unique protein chains: 6

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Soluble cytochrome b562,Melanocortin receptor 3,Fusion protein	A [auth R]	602	Escherichia coli, Homo sapiens	Mutation(s): 0  Gene Names: cybC, MC3R Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P41968 (Homo sapiens) Explore P41968  Go to UniProtKB:  P41968
PHAROS:  P41968 GTEx:  ENSG00000124089

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	B	384	Rattus norvegicus	Mutation(s): 0  Gene Names: Gnb1
UniProt
Find proteins for P54311 (Rattus norvegicus) Explore P54311  Go to UniProtKB:  P54311

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	C [auth G]	71	Bos taurus	Mutation(s): 0  Gene Names: GNG2 Membrane Entity: Yes
UniProt
Find proteins for P63212 (Bos taurus) Explore P63212  Go to UniProtKB:  P63212

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Nanobody35	D [auth N]	160	Lama glama	Mutation(s): 0

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
alpha-MSH	E [auth L]	13	Homo sapiens	Mutation(s): 0  Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P01189 (Homo sapiens) Explore P01189  Go to UniProtKB:  P01189
PHAROS:  P01189 GTEx:  ENSG00000115138

Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(s) subunit alpha isoforms short	F [auth A]	380	Homo sapiens	Mutation(s): 0  Gene Names: GNAS, GNAS1, GSP EC: 3.6.5 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P63092 (Homo sapiens) Explore P63092  Go to UniProtKB:  P63092
PHAROS:  P63092 GTEx:  ENSG00000087460

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA (Subject of Investigation/LOI)	G [auth R]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.90 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.20.1_4487:

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-03-19 
Deposition Author(s): Chen, Q., Fu, J.

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Funding Organization	Location	Grant Number
Other government		Shenzhen Science and Technology Innovation Committee
Other private		Ganghong Young Scholar Development Fund

Revision History  

• Version 1.0: 2025-03-19
  Type: Initial release