8KIG | pdb_00008kig

Cryo-EM structure of MC3R in complex with SHU9119

• PDB DOI: https://doi.org/10.2210/pdb8KIG/pdb
• EM Map EMD-37259: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Escherichia coli, Homo sapiens, Pyrococcus abyssi GE5, synthetic construct
• Expression System: Spodoptera frugiperda
• Mutation(s): No 
• Membrane Protein: Yes  PDBTM


• Deposited: 2023-08-23 Released: 2025-02-26 
• Deposition Author(s): Chen, Q., Fu, J.
• Funding Organization(s): Other government, Other private

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.10 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 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 70.15 kDa 
• Atom Count: 2,104 
• Modeled Residue Count: 267 
• Deposited Residue Count: 628 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Soluble cytochrome b562,Melanocortin receptor 3,GlgA glycogen synthase,Fusion protein	A [auth R]	619	Escherichia coli, Homo sapiens, Pyrococcus abyssi GE5, synthetic construct This entity is chimeric	Mutation(s): 0  Gene Names: cybC, MC3R, PAB2292 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
SHU9119	B [auth L]	9	synthetic construct	Mutation(s): 0

Small Molecules

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

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
NLE	B [auth L]	L-PEPTIDE LINKING	C6 H13 N O2		LEU

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.10 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: 2025-02-26 
Deposition Author(s): Chen, Q., Fu, J.

---

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: 2025-02-26
  Type: Initial release