21LT | pdb_000021lt

Cryo-EM structure of the setmelanotide-bound human melanocortin receptor 4 (MC4R)-Gq complex

PDB DOI: https://doi.org/10.2210/pdb21LT/pdb
EM Map EMD-67804: EMDB EMDataResource

Classification: MEMBRANE PROTEIN
Organism(s): synthetic construct, Homo sapiens, Rattus norvegicus, Bos taurus
Expression System: Trichoplusia ni
Mutation(s): No

Deposited: 2025-12-17 Released: 2026-08-12
Deposition Author(s): Feng, W.B., Zhou, Q.T., Wang, M.W.
Funding Organization(s): National Natural Science Foundation of China (NSFC), Other government

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.11 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

This is version 1.0 of the entry. See complete history.

Literature

Rationale of renewed efforts in developing MC4R modulators to treat metabolic disorders

Feng, W., Zhou, Q., Wang, M.W.

(2026) Acta Pharm Sin B

DOI: https://doi.org/10.1016/j.apsb.2026.06.035

Macromolecule Content

Total Structure Weight: 146.51 kDa
Atom Count: 6,748
Modeled Residue Count: 889
Deposited Residue Count: 1,316
Unique protein chains: 5

Macromolecules

Find similar proteins by: Sequence | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Setmelanotide	A [auth P]	8	synthetic construct	Mutation(s): 0
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Melanocortin receptor 4,LgBiT subunit	B [auth R]	505	Homo sapiens, synthetic construct This entity is chimeric	Mutation(s): 0 Gene Names: MC4R
UniProt & NIH Common Fund Data Resources
Find proteins for P32245 (Homo sapiens) Explore P32245 Go to UniProtKB: P32245
GTEx: ENSG00000166603
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P32245
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
G subunit q (Gi1-Gq chimeric)	C [auth A]	361	Homo sapiens	Mutation(s): 0
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1,HiBiT	D [auth B]	371	Rattus norvegicus, synthetic construct This entity is chimeric	Mutation(s): 0 Gene Names: Gnb1
UniProt
Find proteins for P54311 (Rattus norvegicus) Explore P54311 Go to UniProtKB: P54311
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P54311
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	E [auth G]	71	Bos taurus	Mutation(s): 0 Gene Names: GNG2
UniProt
Find proteins for P63212 (Bos taurus) Explore P63212 Go to UniProtKB: P63212
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P63212
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
CA (Subject of Investigation/LOI) Query on CA Download:Ideal Coordinates CCD File SDF format, chain F [auth R] MOL2 format, chain F [auth R] mmCIF format, chain F [auth R]	F [auth R]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N		Interactions Focus chain F [auth R] Interactions & Density Focus chain F [auth R]

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 3.11 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.18.2_3874
RECONSTRUCTION	cryoSPARC	4.05

Structure Validation

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View more in-depth experimental data

Entry History

& Funding Information

Deposition Data

Released Date: 2026-08-12

Deposition Author(s):

Feng, W.B.

Zhou, Q.T.

Wang, M.W.

Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	82273961
National Natural Science Foundation of China (NSFC)	China	82073904
National Natural Science Foundation of China (NSFC)	China	81872915
Other government	China	2021ZD0203400
Other government	China	ZDKJ2021028
Other government	China	2024M762003