7F4F

Cryo-EM structure of afamelanotide-bound melanocortin-1 receptor in complex with Gs protein and scFv16


Experimental Data Snapshot

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

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural mechanism of calcium-mediated hormone recognition and G beta interaction by the human melanocortin-1 receptor.

Ma, S.Chen, Y.Dai, A.Yin, W.Guo, J.Yang, D.Zhou, F.Jiang, Y.Wang, M.W.Xu, H.E.

(2021) Cell Res 31: 1061-1071

  • DOI: https://doi.org/10.1038/s41422-021-00557-y
  • Primary Citation of Related Structures:  
    7F4D, 7F4F, 7F4H, 7F4I

  • PubMed Abstract: 

    Melanocortins are peptide hormones critical for the regulation of stress response, energy homeostasis, inflammation, and skin pigmentation. Their functions are mediated by five G protein-coupled receptors (MC1R-MC5R), predominately through the stimulatory G protein (Gs). MC1R, the founding member of melanocortin receptors, is mainly expressed in melanocytes and is involved in melanogenesis. Dysfunction of MC1R is associated with the development of melanoma and skin cancer. Here we present three cryo-electron microscopy structures of the MC1R-Gs complexes bound to endogenous hormone α-MSH, a marketed drug afamelanotide, and a synthetic agonist SHU9119. These structures reveal the orthosteric binding pocket for the conserved HFRW motif among melanocortins and the crucial role of calcium ion in ligand binding. They also demonstrate the basis of differential activities among different ligands. In addition, unexpected interactions between MC1R and the Gβ subunit were discovered from these structures. Together, our results elucidate a conserved mechanism of calcium-mediated ligand recognition, a specific mode of G protein coupling, and a universal activation pathway of melanocortin receptors.


  • Organizational Affiliation

    The CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
scFv16A [auth S]285synthetic constructMutation(s): 0 
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Melanocortin-1 receptorB [auth R]621Homo sapiensMutation(s): 0 
Gene Names: MC1RMSHR
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P0ABE7 (Escherichia coli)
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Go to UniProtKB:  P0ABE7
Find proteins for Q01726 (Homo sapiens)
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GTEx:  ENSG00000258839 
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UniProt GroupsP0ABE7Q01726
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(i) subunit alpha-1C [auth A]361Homo sapiensMutation(s): 0 
Gene Names: GNASGNAS1GSPGNAI1
Membrane Entity: Yes 
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PHAROS:  P63096
GTEx:  ENSG00000127955 
Find proteins for P63092 (Homo sapiens)
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GTEx:  ENSG00000087460 
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UniProt GroupsP63096P63092
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2D [auth G]71Homo sapiensMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
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PHAROS:  P59768
GTEx:  ENSG00000186469 
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UniProt GroupP59768
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1E [auth B]371Homo sapiensMutation(s): 0 
Gene Names: GNB1
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PHAROS:  P62873
GTEx:  ENSG00000078369 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Afamelanotide13synthetic constructMutation(s): 0 
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CA (Subject of Investigation/LOI)
Query on CA

Download Ideal Coordinates CCD File 
G [auth R]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
NLE
Query on NLE
F
L-PEPTIDE LINKINGC6 H13 N O2LEU
Experimental Data & Validation

Experimental Data

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

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (MoST, China)China2018YFA0507002

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-08
    Type: Initial release
  • Version 1.1: 2022-02-16
    Changes: Database references