Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 54.62 kDa 
• Atom Count: 3609 
• Modelled Residue Count: 464 
• Deposited 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

• PDB DOI: 10.2210/pdb3EHT/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Escherichia coli K-12, Homo sapiens, synthetic construct
• Expression System: Escherichia coli
• Mutation(s): Yes 


• 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: 3.40 Å
• R-Value Free: 0.252 
• R-Value Work: 0.218 
• R-Value Observed: 0.220 

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:  
  3EHS, 3EHT, 3EHU


• 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

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
FUSION PROTEIN OF CRFR1 EXTRACELLULAR DOMAIN AND MBP	A	476	Escherichia coli K-12, Homo sapiens This entity is chimeric	Mutation(s): 2  Gene Names: malE, CRHR1
UniProt & NIH Common Fund Data Resources
Find proteins for P0AEX9 (Escherichia coli (strain K12)) Explore P0AEX9  Go to UniProtKB:  P0AEX9
Find proteins for P34998 (Homo sapiens) Explore P34998  Go to UniProtKB:  P34998
PHAROS:  P34998
UniProt Groups	P34998P0AEX9

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Corticoliberin	B	16	synthetic construct	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P06850 (Homo sapiens) Explore P06850  Go to UniProtKB:  P06850
PHAROS:  P06850

Oligosaccharides

Help

Entity ID: 3
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose	C	2		N/A
Glycosylation Resources
GlyTouCan:  G07411ON GlyCosmos:  G07411ON

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 3
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900001	C	alpha-maltose	Oligosaccharide / Nutrient		Ligand Interaction

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.40 Å
• R-Value Free: 0.252 
• R-Value Work: 0.218 
• R-Value Observed: 0.220 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 112.977	α = 90
b = 112.977	β = 90
c = 158.24	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-2000	data reduction
HKL-2000	data scaling
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
  Changes: Advisory, Version format compliance
• Version 1.2: 2017-02-08
  Changes: Structure summary
• Version 1.3: 2017-08-02
  Changes: Refinement description, Source and taxonomy
• Version 1.4: 2020-02-26
  Changes: Data collection, Database references, Derived calculations
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
• Version 2.1: 2021-10-20
  Changes: Database references, Structure summary