7DTV

Human Calcium-Sensing Receptor bound with L-Trp and calcium ions


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural mechanism of cooperative activation of the human calcium-sensing receptor by Ca 2+ ions and L-tryptophan.

Ling, S.Shi, P.Liu, S.Meng, X.Zhou, Y.Sun, W.Chang, S.Zhang, X.Zhang, L.Shi, C.Sun, D.Liu, L.Tian, C.

(2021) Cell Res 31: 383-394

  • DOI: 10.1038/s41422-021-00474-0
  • Primary Citation of Related Structures:  
    7DTW, 7DTU, 7DTV, 7DTT

  • PubMed Abstract: 
  • The human calcium-sensing receptor (CaSR) is a class C G protein-coupled receptor (GPCR) responsible for maintaining Ca 2+ homeostasis in the blood. The general consensus is that extracellular Ca 2+ is the principal agonist of CaSR ...

    The human calcium-sensing receptor (CaSR) is a class C G protein-coupled receptor (GPCR) responsible for maintaining Ca 2+ homeostasis in the blood. The general consensus is that extracellular Ca 2+ is the principal agonist of CaSR. Aliphatic and aromatic L-amino acids, such as L-Phe and L-Trp, increase the sensitivity of CaSR towards Ca 2+ and are considered allosteric activators. Crystal structures of the extracellular domain (ECD) of CaSR dimer have demonstrated Ca 2+ and L-Trp binding sites and conformational changes of the ECD upon Ca 2+ /L-Trp binding. However, it remains to be understood at the structural level how Ca 2+ /L-Trp binding to the ECD leads to conformational changes in transmembrane domains (TMDs) and consequent CaSR activation. Here, we determined the structures of full-length human CaSR in the inactive state, Ca 2+ - or L-Trp-bound states, and Ca 2+ /L-Trp-bound active state using single-particle cryo-electron microscopy. Structural studies demonstrate that L-Trp binding induces the closure of the Venus flytrap (VFT) domain of CaSR, bringing the receptor into an intermediate active state. Ca 2+ binding relays the conformational changes from the VFT domains to the TMDs, consequently inducing close contact between the two TMDs of dimeric CaSR, activating the receptor. Importantly, our structural and functional studies reveal that Ca 2+ ions and L-Trp activate CaSR cooperatively. Amino acids are not able to activate CaSR alone, but can promote the receptor activation in the presence of Ca 2+ . Our data provide complementary insights into the activation of class C GPCRs and may aid in the development of novel drugs targeting CaSR.


    Organizational Affiliation

    Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China. cltian@ustc.edu.cn.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Extracellular calcium-sensing receptorA, B1099Homo sapiensMutation(s): 0 
Gene Names: CASRGPRC2APCAR1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P41180 (Homo sapiens)
Explore P41180 
Go to UniProtKB:  P41180
PHAROS:  P41180
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseC, E2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseD, F3N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G47362BJ
GlyCosmos:  G47362BJ
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG (Subject of Investigation/LOI)
Query on NAG

Download Ideal Coordinates CCD File 
J [auth A], K [auth A], L [auth A], M [auth A], Q [auth B], R [auth B], S [auth B], T [auth B]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
TRP (Subject of Investigation/LOI)
Query on TRP

Download Ideal Coordinates CCD File 
G [auth A], O [auth B]TRYPTOPHAN
C11 H12 N2 O2
QIVBCDIJIAJPQS-VIFPVBQESA-N
 Ligand Interaction
CA (Subject of Investigation/LOI)
Query on CA

Download Ideal Coordinates CCD File 
H [auth A], I [auth A], N [auth A], P [auth B]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 3
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900017
Query on PRD_900017
D, Ftriacetyl-beta-chitotrioseOligosaccharide /  Inhibitor Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China--

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-10
    Type: Initial release
  • Version 1.1: 2021-04-14
    Changes: Database references