Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Protein Workshop | Ligand Explorer

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 54624.46 
• Atom Count: 3609 
• Residue Count: 492 
• Unique protein chains: 2

3EHT

Crystal structure of the extracellular domain of human corticotropin releasing factor receptor type 1 (CRFR1) in complex with CRF

• DOI: 10.2210/pdb3EHT/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens, Escherichia coli (strain K12)
• Expression System: Escherichia coli
• Mutation(s): 1 


• Deposited: 2008-09-14 Released: 2008-09-30 
• Deposition Author(s): Pioszak, A.A., Xu, H.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.4 Å
• R-Value Free: 0.252 
• R-Value Work: 0.218 

Literature

Molecular Recognition of Corticotropin-releasing Factor by Its G-protein-coupled Receptor CRFR1.

Pioszak, A.A., Parker, N.R., Suino-Powell, K., Xu, H.E.

(2008) J.Biol.Chem. 283: 32900-32912

• PubMed: 18801728 
• DOI: 10.1074/jbc.M805749200
• Primary Citation of Related Structures:  
  3EHU, 3EHS


• PubMed Abstract: 
  

The bimolecular interaction between corticotropin-releasing factor (CRF), a neuropeptide, and its type 1 receptor (CRFR1), a class B G-protein-coupled receptor (GPCR), is crucial for activation of the hypothalamic-pituitary-adrenal axis in response to stress, and has been a target of intense drug design for the treatment of anxiety, depression, and related disorders. As a class B GPCR, CRFR1 contains an N-terminal extracellular domain (ECD) that provides the primary ligand binding determinants. Here we present three crystal structures of the human CRFR1 ECD, one in a ligand-free form and two in distinct CRF-bound states. The CRFR1 ECD adopts the alpha-beta-betaalpha fold observed for other class B GPCR ECDs, but the N-terminal alpha-helix is significantly shorter and does not contact CRF. CRF adopts a continuous alpha-helix that docks in a hydrophobic surface of the ECD that is distinct from the peptide-binding site of other class B GPCRs, thereby providing a basis for the specificity of ligand recognition between CRFR1 and other class B GPCRs. The binding of CRF is accompanied by clamp-like conformational changes of two loops of the receptor that anchor the CRF C terminus, including the C-terminal amide group. These structural studies provide a molecular framework for understanding peptide binding and specificity by the CRF receptors as well as a template for designing potent and selective CRFR1 antagonists for therapeutic applications.

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Organizational Affiliation: 

Laboratory of Structural Sciences, Van Andel Research Institute, Grand Rapids, Michigan 49503, USA. [e-mail]

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
FUSION PROTEIN OF CRFR1 EXTRACELLULAR DOMAIN AND MBP	A	476	Homo sapiens, Escherichia coli (strain K12) This entity is chimeric	Mutation(s): 1  Gene Names: CRHR1 (CRFR, CRFR1, CRHR), malE
Find proteins for P34998 (Homo sapiens) Go to Gene View: CRHR1 Go to UniProtKB:  P34998
Find proteins for P0AEX9 (Escherichia coli (strain K12)) Go to UniProtKB:  P0AEX9

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Corticoliberin	B	16	Homo sapiens	Mutation(s): 0  Gene Names: CRH
Find proteins for P06850 (Homo sapiens) Go to Gene View: CRH Go to UniProtKB:  P06850

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MAL	A	MALTOSE C12 H22 O11 GUBGYTABKSRVRQ-ASMJPISFSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
NH2	B	NON-POLYMER	H2 N		--

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.4 Å
• R-Value Free: 0.252 
• R-Value Work: 0.218 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 112.977	α = 90.00
b = 112.977	β = 90.00
c = 158.240	γ = 90.00

Software Package:

Software Name	Purpose
HKL-2000	data reduction
HKL-2000	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-09-14 
• Released Date: 2008-09-30 
• Deposition Author(s): Pioszak, A.A., Xu, H.E.

Revision History 

• Version 1.0: 2008-09-30
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Advisory, Version format compliance
• Version 1.2: 2017-02-08
  Type: Structure summary
• Version 1.3: 2017-08-02
  Type: Refinement description, Source and taxonomy