Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 51.71 kDa 
• Atom Count: 3064 
• Modelled Residue Count: 375 
• Deposited Residue Count: 430 
• Unique protein chains: 1

4IB4

Crystal structure of the chimeric protein of 5-HT2B-BRIL in complex with ergotamine

• DOI: 10.2210/pdb4IB4/pdb

• Classification: SIGNALING PROTEIN, ELECTRON TRANSPORT
• Organism(s): Homo sapiens, Escherichia coli
• Expression System: Spodoptera frugiperda
• Mutation(s): Yes 


• Deposited: 2012-12-07 Released: 2013-03-13 
• Deposition Author(s): Wacker, D., Wang, C., Katritch, V., Han, G.W., Huang, X., Vardy, E., McCorvy, J.D., Jiang, Y., Chu, M., Siu, F.Y., Liu, W., Xu, H.E., Cherezov, V., Roth, B.L., Stevens, R.C., GPCR Network (GPCR)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.266 
• R-Value Work: 0.224 
• R-Value Observed: 0.227 

Literature

Structural features for functional selectivity at serotonin receptors.

Wacker, D., Wang, C., Katritch, V., Han, G.W., Huang, X.P., Vardy, E., McCorvy, J.D., Jiang, Y., Chu, M., Siu, F.Y., Liu, W., Xu, H.E., Cherezov, V., Roth, B.L., Stevens, R.C.

(2013) Science 340: 615-619

• PubMed: 23519215 
• DOI: 10.1126/science.1232808
• Primary Citation of Related Structures:  
  4IB4


• PubMed Abstract: 
  

Drugs active at G protein-coupled receptors (GPCRs) can differentially modulate either canonical or noncanonical signaling pathways via a phenomenon known as functional selectivity or biased signaling. We report biochemical studies showing that the hallucinogen lysergic acid diethylamide, its precursor ergotamine (ERG), and related ergolines display strong functional selectivity for β-arrestin signaling at the 5-HT2B 5-hydroxytryptamine (5-HT) receptor, whereas they are relatively unbiased at the 5-HT1B receptor. To investigate the structural basis for biased signaling, we determined the crystal structure of the human 5-HT2B receptor bound to ERG and compared it with the 5-HT1B/ERG structure. Given the relatively poor understanding of GPCR structure and function to date, insight into different GPCR signaling pathways is important to better understand both adverse and favorable therapeutic activities.

---

Organizational Affiliation: 

Department of Integrative Structural and Computational Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Chimera protein of human 5-hydroxytryptamine receptor 2B and E. Coli soluble cytochrome b562	A	430	Homo sapiens, Escherichia coli	Mutation(s): 4  Gene Names: HTR2B, cybC
Membrane protein Mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  G Protein-Coupled Receptors: Class A	Protein:  5-HT2B serotonin receptor with bound ergotamine
Find proteins for P41595 (Homo sapiens) Explore P41595  Go to UniProtKB:  P41595
NIH Common Fund Data Resources
PHAROS:  P41595 GTEx:  ENSG00000135914
Find proteins for P0ABE7 (Escherichia coli) Explore P0ABE7  Go to UniProtKB:  P0ABE7

Small Molecules

Ligands 7 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ERM	B [auth A]	Ergotamine C33 H35 N5 O5 XCGSFFUVFURLIX-VFGNJEKYSA-N
CLR	D [auth A]	CHOLESTEROL C27 H46 O HVYWMOMLDIMFJA-DPAQBDIFSA-N
OLC	E [auth A]	(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate C21 H40 O4 RZRNAYUHWVFMIP-GDCKJWNLSA-N
OLB	F [auth A], G [auth A], H [auth A]	(2S)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate C21 H40 O4 RZRNAYUHWVFMIP-QJRAZLAKSA-N
OLA	I [auth A], J [auth A]	OLEIC ACID C18 H34 O2 ZQPPMHVWECSIRJ-KTKRTIGZSA-N
PLM	C [auth A]	PALMITIC ACID C16 H32 O2 IPCSVZSSVZVIGE-UHFFFAOYSA-N
PEG	K [auth A], L [auth A]	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.266 
• R-Value Work: 0.224 
• R-Value Observed: 0.227 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 60.571	α = 90
b = 119.75	β = 90
c = 170.607	γ = 90

Software Package:

Software Name	Purpose
Blu-Ice	data collection
PHASER	phasing
PHENIX	refinement
BUSTER	refinement
HKL-3000	data reduction
HKL-3000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-12-07 
• Released Date: 2013-03-13 
Deposition Author(s): Wacker, D., Wang, C., Katritch, V., Han, G.W., Huang, X., Vardy, E., McCorvy, J.D., Jiang, Y., Chu, M., Siu, F.Y., Liu, W., Xu, H.E., Cherezov, V., Roth, B.L., Stevens, R.C., GPCR Network (GPCR)

Revision History  

• Version 1.0: 2013-03-13
  Type: Initial release
  
• Version 1.1: 2013-04-03
  Changes: Database references
• Version 1.2: 2013-04-10
  Changes: Database references
• Version 1.3: 2013-05-15
  Changes: Database references
• Version 1.4: 2017-06-07
  Changes: Database references, Structure summary
• Version 1.5: 2017-11-15
  Changes: Refinement description