ISDA

Deposition Date 2012-12-07

Release Date 2013-03-13

Last Version Date 2024-11-06

Entry Detail

PDB ID:

4IAQ

Keywords:

Signaling Protein, Electron Transport

Title:

Crystal structure of the chimeric protein of 5-HT1B-BRIL in complex with dihydroergotamine (PSI Community Target)

Biological Source:

Source Organism:

Homo sapiens (Taxon ID: 9606)
Escherichia coli (Taxon ID: 562)

Host Organism:

Spodoptera frugiperda

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.80 Å

R-Value Free:

0.25

R-Value Work:

0.23

R-Value Observed:

0.23

Space Group:

C 2 2 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Chimera protein of human 5-hydroxytryptamine receptor 1B and E. Coli soluble cytochrome b562
Gene (Uniprot):cybC, HTR1B
Mutations:L138W, M29W, H124I, R128L
Chain IDs:A
Chain Length:403
Number of Molecules:1
Biological Source:Homo sapiens, Escherichia coli

UniProt ID:P28222,P0ABE7 Pfam ID:PF00001, PF07361

Ligand Molecules

2GM

Primary Citation

Structural basis for molecular recognition at serotonin receptors.

Wang, C, Jiang, Y, Ma, J, Wu, H, Wacker, D, Katritch, V, Han, G.W, Liu, W, Huang, X.P, Vardy, E, McCorvy, J.D, Gao, X, Zhou, X.E, Melcher, K, Zhang, C, Bai, F, Yang, H, Yang, L, Jiang, H, Roth, B.L, Cherezov, V, Stevens, R.C, Xu, H.E.Show

Science 340 610 614 (2013)

PMID: 23519210 DOI: 10.1126/science.1232807

Abstact

Serotonin or 5-hydroxytryptamine (5-HT) regulates a wide spectrum of human physiology through the 5-HT receptor family. We report the crystal structures of the human 5-HT1B G protein-coupled receptor bound to the agonist antimigraine medications ergotamine and dihydroergotamine. The structures reveal similar binding modes for these ligands, which occupy the orthosteric pocket and an extended binding pocket close to the extracellular loops. The orthosteric pocket is formed by residues conserved in the 5-HT receptor family, clarifying the family-wide agonist activity of 5-HT. Compared with the structure of the 5-HT2B receptor, the 5-HT1B receptor displays a 3 angstrom outward shift at the extracellular end of helix V, resulting in a more open extended pocket that explains subtype selectivity. Together with docking and mutagenesis studies, these structures provide a comprehensive structural basis for understanding receptor-ligand interactions and designing subtype-selective serotonergic drugs.

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Primary Citation of related structures