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- EMDB-43811: Structure of human calcium-sensing receptor in complex with chime... -

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Entry
Database: EMDB / ID: EMD-43811
TitleStructure of human calcium-sensing receptor in complex with chimeric Gq (miniGisq) protein in nanodiscs
Map dataHuman CaSR-miniGis complex in nanodiscs, composite map of locally refined CaSR ECD, CaSR TMD and G protein
Sample
  • Complex: Human CaSR in complex with chimeric Gq (miniGisq) protein
    • Protein or peptide: x 4 types
  • Ligand: x 7 types
KeywordsCalcium-sensing receptor / G-protein-coupled receptor / G protein / signal transduction / MEMBRANE PROTEIN
Function / homology
Function and homology information


bile acid secretion / chemosensory behavior / response to fibroblast growth factor / cellular response to peptide / cellular response to vitamin D / phosphatidylinositol phospholipase C activity / Class C/3 (Metabotropic glutamate/pheromone receptors) / calcium ion import / positive regulation of positive chemotaxis / fat pad development ...bile acid secretion / chemosensory behavior / response to fibroblast growth factor / cellular response to peptide / cellular response to vitamin D / phosphatidylinositol phospholipase C activity / Class C/3 (Metabotropic glutamate/pheromone receptors) / calcium ion import / positive regulation of positive chemotaxis / fat pad development / cellular response to hepatocyte growth factor stimulus / amino acid binding / branching morphogenesis of an epithelial tube / positive regulation of calcium ion import / regulation of calcium ion transport / cellular response to low-density lipoprotein particle stimulus / detection of calcium ion / anatomical structure morphogenesis / T cell migration / Adenylate cyclase inhibitory pathway / positive regulation of protein localization to cell cortex / regulation of cAMP-mediated signaling / D2 dopamine receptor binding / G protein-coupled serotonin receptor binding / axon terminus / JNK cascade / positive regulation of vasoconstriction / regulation of mitotic spindle organization / chloride transmembrane transport / cellular response to forskolin / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / ossification / response to ischemia / Regulation of insulin secretion / G protein-coupled receptor binding / G protein-coupled receptor activity / cellular response to glucose stimulus / positive regulation of insulin secretion / G-protein beta/gamma-subunit complex binding / Olfactory Signaling Pathway / Activation of the phototransduction cascade / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / G-protein activation / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Prostacyclin signalling through prostacyclin receptor / Glucagon signaling in metabolic regulation / response to peptide hormone / G beta:gamma signalling through CDC42 / G beta:gamma signalling through BTK / ADP signalling through P2Y purinoceptor 12 / Sensory perception of sweet, bitter, and umami (glutamate) taste / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / photoreceptor disc membrane / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / intracellular calcium ion homeostasis / Vasopressin regulates renal water homeostasis via Aquaporins / vasodilation / G alpha (z) signalling events / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / sensory perception of taste / ADP signalling through P2Y purinoceptor 1 / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / GDP binding / cellular response to prostaglandin E stimulus / Inactivation, recovery and regulation of the phototransduction cascade / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / extracellular vesicle / integrin binding / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / GTPase binding / retina development in camera-type eye / Ca2+ pathway / phospholipase C-activating G protein-coupled receptor signaling pathway / cell cortex / cellular response to hypoxia / midbody / fibroblast proliferation / G alpha (i) signalling events / G alpha (s) signalling events / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / basolateral plasma membrane / G alpha (q) signalling events / Ras protein signal transduction / transmembrane transporter binding / cell population proliferation / Extra-nuclear estrogen signaling
Similarity search - Function
GPCR, family 3, extracellular calcium-sensing receptor-related / G-protein coupled receptors family 3 signature 1. / G-protein coupled receptors family 3 signature 2. / GPCR, family 3, nine cysteines domain / GPCR, family 3, nine cysteines domain superfamily / Nine Cysteines Domain of family 3 GPCR / GPCR, family 3, conserved site / G-protein coupled receptors family 3 signature 3. / GPCR, family 3 / G-protein coupled receptors family 3 profile. ...GPCR, family 3, extracellular calcium-sensing receptor-related / G-protein coupled receptors family 3 signature 1. / G-protein coupled receptors family 3 signature 2. / GPCR, family 3, nine cysteines domain / GPCR, family 3, nine cysteines domain superfamily / Nine Cysteines Domain of family 3 GPCR / GPCR, family 3, conserved site / G-protein coupled receptors family 3 signature 3. / GPCR, family 3 / G-protein coupled receptors family 3 profile. / GPCR family 3, C-terminal / 7 transmembrane sweet-taste receptor of 3 GCPR / G-protein alpha subunit, group S / G-protein alpha subunit, group I / Receptor, ligand binding region / Receptor family ligand binding region / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. / G protein alpha subunit / Periplasmic binding protein-like I / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD domain, G-beta repeat / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Guanine nucleotide-binding protein G(s) subunit alpha / Extracellular calcium-sensing receptor / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(i) subunit alpha-1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsZuo H / Park J / Frangaj A / Ye J / Lu G / Manning JJ / Asher WB / Lu Z / Hu G / Wang L ...Zuo H / Park J / Frangaj A / Ye J / Lu G / Manning JJ / Asher WB / Lu Z / Hu G / Wang L / Mendez J / Eng E / Zhang Z / Lin X / Grasucci R / Hendrickson WA / Clarke OB / Javitch JA / Conigrave AD / Fan QR
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM141871 United States
CitationJournal: Nature / Year: 2024
Title: Promiscuous G-protein activation by the calcium-sensing receptor.
Authors: Hao Zuo / Jinseo Park / Aurel Frangaj / Jianxiang Ye / Guanqi Lu / Jamie J Manning / Wesley B Asher / Zhengyuan Lu / Guo-Bin Hu / Liguo Wang / Joshua Mendez / Edward Eng / Zhening Zhang / ...Authors: Hao Zuo / Jinseo Park / Aurel Frangaj / Jianxiang Ye / Guanqi Lu / Jamie J Manning / Wesley B Asher / Zhengyuan Lu / Guo-Bin Hu / Liguo Wang / Joshua Mendez / Edward Eng / Zhening Zhang / Xin Lin / Robert Grassucci / Wayne A Hendrickson / Oliver B Clarke / Jonathan A Javitch / Arthur D Conigrave / Qing R Fan /
Abstract: The human calcium-sensing receptor (CaSR) detects fluctuations in the extracellular Ca concentration and maintains Ca homeostasis. It also mediates diverse cellular processes not associated with Ca ...The human calcium-sensing receptor (CaSR) detects fluctuations in the extracellular Ca concentration and maintains Ca homeostasis. It also mediates diverse cellular processes not associated with Ca balance. The functional pleiotropy of CaSR arises in part from its ability to signal through several G-protein subtypes. We determined structures of CaSR in complex with G proteins from three different subfamilies: G, G and G. We found that the homodimeric CaSR of each complex couples to a single G protein through a common mode. This involves the C-terminal helix of each Gα subunit binding to a shallow pocket that is formed in one CaSR subunit by all three intracellular loops (ICL1-ICL3), an extended transmembrane helix 3 and an ordered C-terminal region. G-protein binding expands the transmembrane dimer interface, which is further stabilized by phospholipid. The restraint imposed by the receptor dimer, in combination with ICL2, enables G-protein activation by facilitating conformational transition of Gα. We identified a single Gα residue that determines G and G versus G selectivity. The length and flexibility of ICL2 allows CaSR to bind all three Gα subtypes, thereby conferring capacity for promiscuous G-protein coupling.
History
DepositionFeb 24, 2024-
Header (metadata) releaseApr 17, 2024-
Map releaseApr 17, 2024-
UpdateNov 13, 2024-
Current statusNov 13, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_43811.png

Downloads & links

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Map

FileDownload / File: emd_43811.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationHuman CaSR-miniGis complex in nanodiscs, composite map of locally refined CaSR ECD, CaSR TMD and G protein
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 512 pix.
= 422.4 Å		0.83 Å/pix.
x 512 pix.
= 422.4 Å		0.83 Å/pix.
x 512 pix.
= 422.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.825 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.3
Minimum - Maximum0.0 - 4.172179
Average (Standard dev.)0.0020554885 (±0.041765396)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 422.4 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Human CaSR in complex with chimeric Gq (miniGisq) protein

EntireName: Human CaSR in complex with chimeric Gq (miniGisq) protein
Components
  • Complex: Human CaSR in complex with chimeric Gq (miniGisq) protein
    • Protein or peptide: Isoform 1 of Extracellular calcium-sensing receptor
    • Protein or peptide: Chimeric mini guanine nucleotide-binding protein G(i)(s)(q) subunit alpha
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Chimeric mini guanine nucleotide-binding protein G(i)(s)(q) subunit alpha
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: CYCLOMETHYLTRYPTOPHAN
  • Ligand: PHOSPHATE ION
  • Ligand: CALCIUM ION
  • Ligand: 3-(2-chlorophenyl)-N-[(1R)-1-(3-methoxyphenyl)ethyl]propan-1-amine
  • Ligand: CHOLESTEROL HEMISUCCINATE
  • Ligand: (19R,22S,25R)-22,25,26-trihydroxy-16,22-dioxo-17,21,23-trioxa-22lambda~5~-phosphahexacosan-19-yl (9Z)-octadec-9-enoate

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Supramolecule #1: Human CaSR in complex with chimeric Gq (miniGisq) protein

SupramoleculeName: Human CaSR in complex with chimeric Gq (miniGisq) protein
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 276 KDa

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Macromolecule #1: Isoform 1 of Extracellular calcium-sensing receptor

MacromoleculeName: Isoform 1 of Extracellular calcium-sensing receptor / type: protein_or_peptide / ID: 1
Details: The CaSR construct consists of residues 1-903 and a Flag tag inserted after the signal peptide
Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 102.864617 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MAFYSCCWVL LALTWHTSAD YKDDDDKYGP DQRAQKKGDI ILGGLFPIHF GVAAKDQDLK SRPESVECIR YNFRGFRWLQ AMIFAIEEI NSSPALLPNL TLGYRIFDTC NTVSKALEAT LSFVAQNKID SLNLDEFCNC SEHIPSTIAV VGATGSGVST A VANLLGLF ...String:
MAFYSCCWVL LALTWHTSAD YKDDDDKYGP DQRAQKKGDI ILGGLFPIHF GVAAKDQDLK SRPESVECIR YNFRGFRWLQ AMIFAIEEI NSSPALLPNL TLGYRIFDTC NTVSKALEAT LSFVAQNKID SLNLDEFCNC SEHIPSTIAV VGATGSGVST A VANLLGLF YIPQVSYASS SRLLSNKNQF KSFLRTIPND EHQATAMADI IEYFRWNWVG TIAADDDYGR PGIEKFREEA EE RDICIDF SELISQYSDE EEIQHVVEVI QNSTAKVIVV FSSGPDLEPL IKEIVRRNIT GKIWLASEAW ASSSLIAMPQ YFH VVGGTI GFALKAGQIP GFREFLKKVH PRKSVHNGFA KEFWEETFNC HLQEGAKGPL PVDTFLRGHE ESGDRFSNSS TAFR PLCTG DENISSVETP YIDYTHLRIS YNVYLAVYSI AHALQDIYTC LPGRGLFTNG SCADIKKVEA WQVLKHLRHL NFTNN MGEQ VTFDECGDLV GNYSIINWHL SPEDGSIVFK EVGYYNVYAK KGERLFINEE KILWSGFSRE VPFSNCSRDC LAGTRK GII EGEPTCCFEC VECPDGEYSD ETDASACNKC PDDFWSNENH TSCIAKEIEF LSWTEPFGIA LTLFAVLGIF LTAFVLG VF IKFRNTPIVK ATNRELSYLL LFSLLCCFSS SLFFIGEPQD WTCRLRQPAF GISFVLCISC ILVKTNRVLL VFEAKIPT S FHRKWWGLNL QFLLVFLCTF MQIVICVIWL YTAPPSSYRN QELEDEIIFI TCHEGSLMAL GFLIGYTCLL AAICFFFAF KSRKLPENFN EAKFITFSML IFFIVWISFI PAYASTYGKF VSAVEVIAIL AASFGLLACI FFNKIYIILF KPSRNTIEEV RCSTAAHAF KVAARATLRR SNVSRKRSSS LG

UniProtKB: Extracellular calcium-sensing receptor

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Macromolecule #2: Chimeric mini guanine nucleotide-binding protein G(i)(s)(q) subun...

MacromoleculeName: Chimeric mini guanine nucleotide-binding protein G(i)(s)(q) subunit alpha
type: protein_or_peptide / ID: 2
Details: MiniG(q) alpha is a chimeric protein engineered based on the miniG(s) alpha skeleton [miniG(s)(q) alpha]. Chimeric miniG(i)(s)(q) alpha construct was designed where the N-terminal 25 amino ...Details: MiniG(q) alpha is a chimeric protein engineered based on the miniG(s) alpha skeleton [miniG(s)(q) alpha]. Chimeric miniG(i)(s)(q) alpha construct was designed where the N-terminal 25 amino acids of G(s) alpha was replaced with the initial 18 residues of G(i1) alpha
Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 28.306148 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MGCTLSAEDK AAVERSKMIE KQLQKDKQVY RATHRLLLLG ADNSGKSTIV KQMRILHGGS GGSGGTSGIF ETKFQVDKVN FHMFDVGGQ RDERRKWIQC FNDVTAIIFV VDSSDYNRLQ EALNDFKSIW NNRWLRTISV ILFLNKQDLL AEKVLAGKSK I EDYFPEFA ...String:
MGCTLSAEDK AAVERSKMIE KQLQKDKQVY RATHRLLLLG ADNSGKSTIV KQMRILHGGS GGSGGTSGIF ETKFQVDKVN FHMFDVGGQ RDERRKWIQC FNDVTAIIFV VDSSDYNRLQ EALNDFKSIW NNRWLRTISV ILFLNKQDLL AEKVLAGKSK I EDYFPEFA RYTTPEDATP EPGEDPRVTR AKYFIRDEFL RISTASGDGR HYCYPHFTCA VDTENARRIF NDCKDIILQM NL REYNLV

UniProtKB: Guanine nucleotide-binding protein G(i) subunit alpha-1, Guanine nucleotide-binding protein G(s) subunit alpha

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Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 3
Details: The guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 construct contains a Flag epitope fused to the N-terminus.
Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 38.413895 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MDYKDDDDKS ELDQLRQEAE QLKNQIRDAR KACADATLSQ ITNNIDPVGR IQMRTRRTLR GHLAKIYAMH WGTDSRLLVS ASQDGKLII WDSYTTNKVH AIPLRSSWVM TCAYAPSGNY VACGGLDNIC SIYNLKTREG NVRVSRELAG HTGYLSCCRF L DDNQIVTS ...String:
MDYKDDDDKS ELDQLRQEAE QLKNQIRDAR KACADATLSQ ITNNIDPVGR IQMRTRRTLR GHLAKIYAMH WGTDSRLLVS ASQDGKLII WDSYTTNKVH AIPLRSSWVM TCAYAPSGNY VACGGLDNIC SIYNLKTREG NVRVSRELAG HTGYLSCCRF L DDNQIVTS SGDTTCALWD IETGQQTTTF TGHTGDVMSL SLAPDTRLFV SGACDASAKL WDVREGMCRQ TFTGHESDIN AI CFFPNGN AFATGSDDAT CRLFDLRADQ ELMTYSHDNI ICGITSVSFS KSGRLLLAGY DDFNCNVWDA LKADRAGVLA GHD NRVSCL GVTDDGMAVA TGSWDSFLKI WN

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #4: Chimeric mini guanine nucleotide-binding protein G(i)(s)(q) subun...

MacromoleculeName: Chimeric mini guanine nucleotide-binding protein G(i)(s)(q) subunit alpha
type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #6: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 6 / Number of copies: 6 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #7: CYCLOMETHYLTRYPTOPHAN

MacromoleculeName: CYCLOMETHYLTRYPTOPHAN / type: ligand / ID: 7 / Number of copies: 2 / Formula: TCR
Molecular weightTheoretical: 216.236 Da
Chemical component information

ChemComp-TCR:
CYCLOMETHYLTRYPTOPHAN

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Macromolecule #8: PHOSPHATE ION

MacromoleculeName: PHOSPHATE ION / type: ligand / ID: 8 / Number of copies: 2 / Formula: PO4
Molecular weightTheoretical: 94.971 Da
Chemical component information

ChemComp-PO4:
PHOSPHATE ION

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Macromolecule #9: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 9 / Number of copies: 6 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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Macromolecule #10: 3-(2-chlorophenyl)-N-[(1R)-1-(3-methoxyphenyl)ethyl]propan-1-amine

MacromoleculeName: 3-(2-chlorophenyl)-N-[(1R)-1-(3-methoxyphenyl)ethyl]propan-1-amine
type: ligand / ID: 10 / Number of copies: 2 / Formula: 9IG
Molecular weightTheoretical: 303.826 Da
Chemical component information

ChemComp-9IG:
3-(2-chlorophenyl)-N-[(1R)-1-(3-methoxyphenyl)ethyl]propan-1-amine

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Macromolecule #11: CHOLESTEROL HEMISUCCINATE

MacromoleculeName: CHOLESTEROL HEMISUCCINATE / type: ligand / ID: 11 / Number of copies: 1 / Formula: Y01
Molecular weightTheoretical: 486.726 Da
Chemical component information

ChemComp-Y01:
CHOLESTEROL HEMISUCCINATE

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Macromolecule #12: (19R,22S,25R)-22,25,26-trihydroxy-16,22-dioxo-17,21,23-trioxa-22l...

MacromoleculeName: (19R,22S,25R)-22,25,26-trihydroxy-16,22-dioxo-17,21,23-trioxa-22lambda~5~-phosphahexacosan-19-yl (9Z)-octadec-9-enoate
type: ligand / ID: 12 / Number of copies: 1 / Formula: A1AF7
Molecular weightTheoretical: 749.007 Da

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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

Concentration3.6 mg/mL
BufferpH: 7.5
Component:
ConcentrationFormulaName
20.0 mMC8H18N2O4SHEPES
100.0 mMNaClSodium chloride
2.0 mMMgCl2Magnesium chloride
10.0 mMCaCl2Calcium chloride
20.0 uMC12H12N2O2TNCA
20.0 uMC18H22ClNOHClR568 HCl
GridModel: Quantifoil R0.6/1 / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Support film - topology: HOLEY / Support film - Film thickness: 50 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 25 sec. / Pretreatment - Atmosphere: OTHER
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV
Details: The sample was blotted for 6s before plunge-frozen..

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Electron microscopy

MicroscopeFEI TITAN KRIOS
TemperatureMax: 100.0 K
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 15 eV
SoftwareName: EPU
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Digitization - Dimensions - Width: 11520 pixel / Digitization - Dimensions - Height: 8184 pixel / Number grids imaged: 1 / Number real images: 9336 / Average exposure time: 3.0 sec. / Average electron dose: 74.9 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.9000000000000001 µm / Nominal defocus min: 1.2 µm / Nominal magnification: 105000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 1339334
Startup modelType of model: OTHER / Details: Ab initio
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 3.3.2) / Number images used: 91042
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.2)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.2)

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Atomic model buiding 1

Initial model
PDB IDChain

7sil

chain_id: Q, source_name: PDB, initial_model_type: experimental model

7sil

chain_id: R, source_name: PDB, initial_model_type: experimental model

7p00

chain_id: A, source_name: PDB, initial_model_type: experimental model

7p00

chain_id: B, source_name: PDB, initial_model_type: experimental model

7p00

chain_id: G, source_name: PDB, initial_model_type: experimental model
SoftwareName: Coot (ver. 0.9.8.1)
RefinementSpace: REAL / Protocol: FLEXIBLE FIT
Output model

PDB-9asb:
Structure of human calcium-sensing receptor in complex with chimeric Gq (miniGisq) protein in nanodiscs

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