5K5T

Crystal structure of the inactive form of human calcium-sensing receptor extracellular domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.222 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural mechanism of ligand activation in human calcium-sensing receptor.

Geng, Y.Mosyak, L.Kurinov, I.Zuo, H.Sturchler, E.Cheng, T.C.Subramanyam, P.Brown, A.P.Brennan, S.C.Mun, H.C.Bush, M.Chen, Y.Nguyen, T.X.Cao, B.Chang, D.D.Quick, M.Conigrave, A.D.Colecraft, H.M.McDonald, P.Fan, Q.R.

(2016) Elife 5: --

  • DOI: 10.7554/eLife.13662
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Human calcium-sensing receptor (CaSR) is a G-protein-coupled receptor (GPCR) that maintains extracellular Ca(2+) homeostasis through the regulation of parathyroid hormone secretion. It functions as a disulfide-tethered homodimer composed of three mai ...

    Human calcium-sensing receptor (CaSR) is a G-protein-coupled receptor (GPCR) that maintains extracellular Ca(2+) homeostasis through the regulation of parathyroid hormone secretion. It functions as a disulfide-tethered homodimer composed of three main domains, the Venus Flytrap module, cysteine-rich domain, and seven-helix transmembrane region. Here, we present the crystal structures of the entire extracellular domain of CaSR in the resting and active conformations. We provide direct evidence that L-amino acids are agonists of the receptor. In the active structure, L-Trp occupies the orthosteric agonist-binding site at the interdomain cleft and is primarily responsible for inducing extracellular domain closure to initiate receptor activation. Our structures reveal multiple binding sites for Ca(2+) and PO4(3-) ions. Both ions are crucial for structural integrity of the receptor. While Ca(2+) ions stabilize the active state, PO4(3-) ions reinforce the inactive conformation. The activation mechanism of CaSR involves the formation of a novel dimer interface between subunits.


    Organizational Affiliation

    Department of Pharmacology, Columbia University, New York, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Extracellular calcium-sensing receptor
A
615Homo sapiensMutation(s): 2 
Gene Names: CASR (GPRC2A, PCAR1)
Find proteins for P41180 (Homo sapiens)
Go to Gene View: CASR
Go to UniProtKB:  P41180
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.222 
  • Space Group: F 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 126.330α = 90.00
b = 150.150β = 90.00
c = 214.580γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
American Heart AssociationUnited States15GRNT25420002
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01GM112973

Revision History 

  • Version 1.0: 2016-08-03
    Type: Initial release
  • Version 1.1: 2017-09-20
    Type: Author supporting evidence, Derived calculations