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- EMDB-41910: Local refinement map on CRD-7TM of active-state CaSR in lipid nan... -

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Basic information

Entry
Database: EMDB / ID: EMD-41910
TitleLocal refinement map on CRD-7TM of active-state CaSR in lipid nanodiscs
Map data
Sample
  • Complex: Cinacalcet-bound active-state human calcium-sensing receptor CaSR in lipid nanodiscs
KeywordsFamily C GPCR / Calcium-sensing Receptor (CaSR) / Cryo-EM / Lipid Nanodiscs / Positive Allosteric Modulator / Membrane Protein / SIGNALING PROTEIN
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsHe F / Wu C / Gao Y / Skiniotis G
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)5R01DK132902-02 United States
CitationJournal: Nature / Year: 2024
Title: Allosteric modulation and G-protein selectivity of the Ca-sensing receptor.
Authors: Feng He / Cheng-Guo Wu / Yang Gao / Sabrina N Rahman / Magda Zaoralová / Makaía M Papasergi-Scott / Ting-Jia Gu / Michael J Robertson / Alpay B Seven / Lingjun Li / Jesper M Mathiesen / Georgios Skiniotis /
Abstract: The calcium-sensing receptor (CaSR) is a family C G-protein-coupled receptor (GPCR) that has a central role in regulating systemic calcium homeostasis. Here we use cryo-electron microscopy and ...The calcium-sensing receptor (CaSR) is a family C G-protein-coupled receptor (GPCR) that has a central role in regulating systemic calcium homeostasis. Here we use cryo-electron microscopy and functional assays to investigate the activation of human CaSR embedded in lipid nanodiscs and its coupling to functional G versus G proteins in the presence and absence of the calcimimetic drug cinacalcet. High-resolution structures show that both G and G drive additional conformational changes in the activated CaSR dimer to stabilize a more extensive asymmetric interface of the seven-transmembrane domain (7TM) that involves key protein-lipid interactions. Selective G and G coupling by the receptor is achieved through substantial rearrangements of intracellular loop 2 and the C terminus, which contribute differentially towards the binding of the two G-protein subtypes, resulting in distinct CaSR-G-protein interfaces. The structures also reveal that natural polyamines target multiple sites on CaSR to enhance receptor activation by zipping negatively charged regions between two protomers. Furthermore, we find that the amino acid L-tryptophan, a well-known ligand of CaSR extracellular domains, occupies the 7TM bundle of the G-protein-coupled protomer at the same location as cinacalcet and other allosteric modulators. Together, these results provide a framework for G-protein activation and selectivity by CaSR, as well as its allosteric modulation by endogenous and exogenous ligands.
History
DepositionSep 11, 2023-
Header (metadata) releaseMay 29, 2024-
Map releaseMay 29, 2024-
UpdateMay 29, 2024-
Current statusMay 29, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_41910.png

Downloads & links

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Map

FileDownload / File: emd_41910.map.gz / Format: CCP4 / Size: 421.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.8677 Å
Density
Contour LevelBy AUTHOR: 0.3
Minimum - Maximum-2.1367028 - 3.0596519
Average (Standard dev.)-0.00025293705 (±0.029300258)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions480480480
Spacing480480480
CellA=B=C: 416.496 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_41910_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_41910_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Cinacalcet-bound active-state human calcium-sensing receptor CaSR...

EntireName: Cinacalcet-bound active-state human calcium-sensing receptor CaSR in lipid nanodiscs
Components
  • Complex: Cinacalcet-bound active-state human calcium-sensing receptor CaSR in lipid nanodiscs

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Supramolecule #1: Cinacalcet-bound active-state human calcium-sensing receptor CaSR...

SupramoleculeName: Cinacalcet-bound active-state human calcium-sensing receptor CaSR in lipid nanodiscs
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Homo sapiens (human)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.5 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 234170
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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