6G79

Coupling specificity of heterotrimeric Go to the serotonin 5-HT1B receptor


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.78 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

Cryo-EM structure of the serotonin 5-HT1Breceptor coupled to heterotrimeric Go.

Garcia-Nafria, J.Nehme, R.Edwards, P.C.Tate, C.G.

(2018) Nature 558: 620-623

  • DOI: 10.1038/s41586-018-0241-9

  • PubMed Abstract: 
  • G-protein-coupled receptors (GPCRs) form the largest family of receptors encoded by the human genome (around 800 genes). They transduce signals by coupling to a small number of heterotrimeric G proteins (16 genes encoding different α-subunits). Each ...

    G-protein-coupled receptors (GPCRs) form the largest family of receptors encoded by the human genome (around 800 genes). They transduce signals by coupling to a small number of heterotrimeric G proteins (16 genes encoding different α-subunits). Each human cell contains several GPCRs and G proteins. The structural determinants of coupling of G s to four different GPCRs have been elucidated 1-4 , but the molecular details of how the other G-protein classes couple to GPCRs are unknown. Here we present the cryo-electron microscopy structure of the serotonin 5-HT 1B receptor (5-HT 1B R) bound to the agonist donitriptan and coupled to an engineered G o heterotrimer. In this complex, 5-HT 1B R is in an active state; the intracellular domain of the receptor is in a similar conformation to that observed for the β 2 -adrenoceptor (β 2 AR) 3 or the adenosine A 2A receptor (A 2A R) 1 in complex with G s . In contrast to the complexes with G s , the gap between the receptor and the Gβ-subunit in the G o -5-HT 1B R complex precludes molecular contacts, and the interface between the Gα-subunit of G o and the receptor is considerably smaller. These differences are likely to be caused by the differences in the interactions with the C terminus of the G o α-subunit. The molecular variations between the interfaces of G o and G s in complex with GPCRs may contribute substantially to both the specificity of coupling and the kinetics of signalling.


    Organizational Affiliation

    MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, CB2 0QH, UK.,MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, CB2 0QH, UK. cgt@mrc-lmb.cam.ac.uk.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
B
339Homo sapiensMutation(s): 0 
Gene Names: GNB1
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
G Protein-Coupled Receptors (GPCRs)
Protein: 
5-HT1B serotonin receptor with bound ergotamine
Find proteins for P62873 (Homo sapiens)
Go to Gene View: GNB1
Go to UniProtKB:  P62873
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
G
71Homo sapiensMutation(s): 0 
Gene Names: GNG2
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
G Protein-Coupled Receptors (GPCRs)
Protein: 
5-HT1B serotonin receptor with bound ergotamine
Find proteins for P59768 (Homo sapiens)
Go to Gene View: GNG2
Go to UniProtKB:  P59768
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Guanine nucleotide-binding protein G(o) subunit alpha
A
225Homo sapiensMutation(s): 0 
Gene Names: GNAO1
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
G Protein-Coupled Receptors (GPCRs)
Protein: 
5-HT1B serotonin receptor with bound ergotamine
Find proteins for P09471 (Homo sapiens)
Go to Gene View: GNAO1
Go to UniProtKB:  P09471
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
5-hydroxytryptamine receptor 1B
S
364Homo sapiensMutation(s): 0 
Gene Names: HTR1B (HTR1DB)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
G Protein-Coupled Receptors (GPCRs)
Protein: 
5-HT1B serotonin receptor with bound ergotamine
Find proteins for P28222 (Homo sapiens)
Go to Gene View: HTR1B
Go to UniProtKB:  P28222
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EP5
Query on EP5

Download SDF File 
Download CCD File 
S
2-[5-[2-[4-(4-cyanophenyl)piperazin-1-yl]-2-oxidanylidene-ethoxy]-1~{H}-indol-3-yl]ethylazanium
C23 H26 N5 O2
SOHCKWZVTCTQBG-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.78 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research CouncilUnited KingdomEMPSI 339995
Medical Research Council (United Kingdom)United KingdomMRC U105197215

Revision History 

  • Version 1.0: 2018-06-20
    Type: Initial release
  • Version 1.1: 2018-07-04
    Type: Data collection, Database references
  • Version 2.0: 2018-09-19
    Type: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary