ISDA

Entry Detail

PDB ID:

6W25

Keywords:

MEMBRANE PROTEIN

Title:

Crystal structure of the Melanocortin-4 Receptor (MC4R) in complex with SHU9119

Biological Source:

Source Organism:

Homo sapiens, Pyrococcus abyssi, synthetic construct

Host Organism:

Spodoptera frugiperda

PDB Version:

Deposition Date:

2020-03-04

Release Date:

2020-04-29

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.75 Å

R-Value Free:

0.25

R-Value Work:

0.23

R-Value Observed:

0.23

Space Group:

C 1 2 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Melanocortin receptor 4,GlgA glycogen synthase,Melanocortin receptor 4
Chain IDs:A
Chain Length:535
Number of Molecules:1
Biological Source:Homo sapiens, Pyrococcus abyssi

UniProt ID:P32245 Pfam ID:PF00001

Polymer Type:polypeptide(L)
Description:SHU9119
Chain IDs:B
Chain Length:9
Number of Molecules:1
Biological Source:synthetic construct

Modified Residue

Compound ID	Chain ID	Parent Comp ID	Details	2D Image
YCM	A	CYS	modified residue

Ligand Molecules

OLA

Primary Citation

Determination of the melanocortin-4 receptor structure identifies Ca2+as a cofactor for ligand binding.

Yu, J, Gimenez, L.E, Hernandez, C.C, Wu, Y, Wein, A.H, Han, G.W, McClary, K, Mittal, S.R, Burdsall, K, Stauch, B, Wu, L, Stevens, S.N, Peisley, A, Williams, S.Y, Chen, V, Millhauser, G.L, Zhao, S, Cone, R.D, Stevens, R.C.Show

Science 368 428 433 (2020)

PMID: 32327598 DOI: 10.1126/science.aaz8995

Abstact

The melanocortin-4 receptor (MC4R) is involved in energy homeostasis and is an important drug target for syndromic obesity. We report the structure of the antagonist SHU9119-bound human MC4R at 2.8-angstrom resolution. Ca2+ is identified as a cofactor that is complexed with residues from both the receptor and peptide ligand. Extracellular Ca2+ increases the affinity and potency of the endogenous agonist α-melanocyte-stimulating hormone at the MC4R by 37- and 600-fold, respectively. The ability of the MC4R crystallized construct to couple to ion channel Kir7.1, while lacking cyclic adenosine monophosphate stimulation, highlights a heterotrimeric GTP-binding protein (G protein)-independent mechanism for this signaling modality. MC4R is revealed as a structurally divergent G protein-coupled receptor (GPCR), with more similarity to lipidic GPCRs than to the homologous peptidic GPCRs.

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Primary Citation of related structures