5K5S

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.2 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 Pathology and Cell Biology, Columbia University, New York, United States.,Department of Physiology and Cellular Biophysics, Columbia University, New York, United States.,Department of Pharmacology, Columbia University, New York, United States.,Department of Molecular Therapeutics, The Scripps Translational Science Institute, Jupiter, United States.,Department of Chemistry and Chemical Biology, Cornell University, Ithaca, United States.,School of Life and Environmental Sciences, University of Sydney, New South Wales, Australia.,Department of Psychiatry, Columbia University, New York, United States.,Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Extracellular calcium-sensing receptor
A, B
615Homo sapiensMutation(s): 3 
Gene Names: CASR (GPRC2A, PCAR1)
Find proteins for P41180 (Homo sapiens)
Go to Gene View: CASR
Go to UniProtKB:  P41180
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A, B
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
TRP
Query on TRP

Download SDF File 
Download CCD File 
A, B
TRYPTOPHAN
C11 H12 N2 O2
QIVBCDIJIAJPQS-VIFPVBQESA-N
 Ligand Interaction
NAG
Query on NAG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.211 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 107.660α = 90.00
b = 127.450β = 108.72
c = 146.770γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
Aimlessdata scaling
XDSdata reduction
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: 2016-08-24
    Type: Data collection
  • Version 1.2: 2017-09-20
    Type: Author supporting evidence, Derived calculations