3C4M

Structure of human parathyroid hormone in complex with the extracellular domain of its G-protein-coupled receptor (PTH1R)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Molecular recognition of parathyroid hormone by its G protein-coupled receptor.

Pioszak, A.A.Xu, H.E.

(2008) Proc.Natl.Acad.Sci.Usa 105: 5034-5039

  • DOI: 10.1073/pnas.0801027105

  • PubMed Abstract: 
  • Parathyroid hormone (PTH) is central to calcium homeostasis and bone maintenance in vertebrates, and as such it has been used for treating osteoporosis. It acts primarily by binding to its receptor, PTH1R, a member of the class B G protein-coupled re ...

    Parathyroid hormone (PTH) is central to calcium homeostasis and bone maintenance in vertebrates, and as such it has been used for treating osteoporosis. It acts primarily by binding to its receptor, PTH1R, a member of the class B G protein-coupled receptor (GPCR) family that also includes receptors for glucagon, calcitonin, and other therapeutically important peptide hormones. Despite considerable interest and much research, determining the structure of the receptor-hormone complex has been hindered by difficulties in purifying the receptor and obtaining diffraction-quality crystals. Here, we present a method for expression and purification of the extracellular domain (ECD) of human PTH1R engineered as a maltose-binding protein (MBP) fusion that readily crystallizes. The 1.95-A structure of PTH bound to the MBP-PTH1R-ECD fusion reveals that PTH docks as an amphipathic helix into a central hydrophobic groove formed by a three-layer alpha-beta-betaalpha fold of the PTH1R ECD, resembling a hot dog in a bun. Conservation in the ECD scaffold and the helical structure of peptide hormones emphasizes this hot dog model as a general mechanism of hormone recognition common to class B GPCRs. Our findings reveal critical insights into PTH actions and provide a rational template for drug design that targets this hormone signaling pathway.


    Organizational Affiliation

    Laboratory of Structural Sciences, Van Andel Research Institute, 333 Bostwick Avenue, N.E., Grand Rapids, MI 49503, USA




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fusion protein of Maltose-binding periplasmic protein and Parathyroid hormone/parathyroid hormone-related peptide receptor
A, B
539Homo sapiensEscherichia coli (strain K12)
This entity is chimeric
Mutation(s): 0 
Gene Names: PTH1R (PTHR, PTHR1), malE
Find proteins for Q03431 (Homo sapiens)
Go to Gene View: PTH1R
Go to UniProtKB:  Q03431
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEX9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Parathyroid hormone
C, D
21Homo sapiensMutation(s): 0 
Gene Names: PTH
Find proteins for P01270 (Homo sapiens)
Go to Gene View: PTH
Go to UniProtKB:  P01270
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAL
Query on MAL

Download SDF File 
Download CCD File 
A, B
MALTOSE
C12 H22 O11
GUBGYTABKSRVRQ-ASMJPISFSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
C, D
NON-POLYMERH2 N

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 62.919α = 90.00
b = 116.791β = 108.80
c = 78.416γ = 90.00
Software Package:
Software NamePurpose
MAR345dtbdata collection
HKL-2000data reduction
PHASERphasing
REFMACrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-04-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2017-08-02
    Type: Refinement description, Source and taxonomy