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- EMDB-23996: CryoEM Structure of mGlu2 - Gi Complex -

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Basic information

Entry
Database: EMDB / ID: EMD-23996
TitleCryoEM Structure of mGlu2 - Gi Complex
Map dataComposite CryoEM Map of mGlu2 - Heterotrimeric Gi Complex
Sample
  • Complex: mGlu2 - Heterotrimeric Gi complex
    • Protein or peptide: Metabotropic glutamate receptor 2
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
  • Ligand: 2-methoxy-6-propyl-N-(2-{4-[(1H-tetrazol-5-yl)methoxy]phenyl}ethyl)thieno[2,3-d]pyrimidin-4-amine
  • Ligand: GLUTAMIC ACID
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
Function / homology
Function and homology information


regulation of response to drug / group II metabotropic glutamate receptor activity / behavioral response to nicotine / intracellular glutamate homeostasis / negative regulation of adenylate cyclase activity / G protein-coupled glutamate receptor signaling pathway / astrocyte projection / Class C/3 (Metabotropic glutamate/pheromone receptors) / glutamate secretion / glutamate receptor activity ...regulation of response to drug / group II metabotropic glutamate receptor activity / behavioral response to nicotine / intracellular glutamate homeostasis / negative regulation of adenylate cyclase activity / G protein-coupled glutamate receptor signaling pathway / astrocyte projection / Class C/3 (Metabotropic glutamate/pheromone receptors) / glutamate secretion / glutamate receptor activity / regulation of glutamate secretion / long-term synaptic depression / regulation of dopamine secretion / calcium channel regulator activity / 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 / regulation of mitotic spindle organization / cellular response to forskolin / regulation of synaptic transmission, glutamatergic / presynaptic modulation of chemical synaptic transmission / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / response to cocaine / Regulation of insulin secretion / G protein-coupled receptor activity / G protein-coupled receptor binding / 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 activation / G protein-coupled acetylcholine receptor signaling pathway / 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 / G beta:gamma signalling through CDC42 / ADP signalling through P2Y purinoceptor 12 / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / Sensory perception of sweet, bitter, and umami (glutamate) taste / response to peptide hormone / photoreceptor disc membrane / Adrenaline,noradrenaline inhibits insulin secretion / Glucagon-type ligand receptors / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / cellular response to catecholamine stimulus / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADORA2B mediated anti-inflammatory cytokines production / sensory perception of taste / ADP signalling through P2Y purinoceptor 1 / adenylate cyclase-activating dopamine receptor signaling pathway / G beta:gamma signalling through PI3Kgamma / cellular response to prostaglandin E stimulus / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / GDP binding / G-protein beta-subunit binding / Inactivation, recovery and regulation of the phototransduction cascade / heterotrimeric G-protein complex / G alpha (12/13) signalling events / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / GTPase binding / retina development in camera-type eye / presynaptic membrane / phospholipase C-activating G protein-coupled receptor signaling pathway / Ca2+ pathway / gene expression / cell cortex / midbody / G alpha (i) signalling events / fibroblast proliferation / G alpha (s) signalling events / scaffold protein binding / G alpha (q) signalling events / chemical synaptic transmission / cell population proliferation / Ras protein signal transduction / Extra-nuclear estrogen signaling / positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / G protein-coupled receptor signaling pathway / cell cycle / cell division / lysosomal membrane / axon / GTPase activity / centrosome / glutamatergic synapse / synapse / dendrite / protein-containing complex binding / nucleolus
Similarity search - Function
GPCR, family 3, metabotropic glutamate receptor 2 / GPCR, family 3, metabotropic glutamate receptor / 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 ...GPCR, family 3, metabotropic glutamate receptor 2 / GPCR, family 3, metabotropic glutamate receptor / 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 I / Receptor, ligand binding region / Receptor family ligand binding region / G-alpha domain profile. / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G protein alpha subunit / Periplasmic binding protein-like I / G-protein, gamma subunit / G-protein gamma subunit domain profile. / GGL domain / G-protein gamma-like domain superfamily / G-protein gamma-like domain / GGL domain / G protein gamma subunit-like motifs / 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(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 / Metabotropic glutamate receptor 2
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsSeven AB / Barros-Alvarez X / Skiniotis G
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R01 NS092695 United States
CitationJournal: Nature / Year: 2021
Title: G-protein activation by a metabotropic glutamate receptor.
Authors: Alpay B Seven / Ximena Barros-Álvarez / Marine de Lapeyrière / Makaía M Papasergi-Scott / Michael J Robertson / Chensong Zhang / Robert M Nwokonko / Yang Gao / Justin G Meyerowitz / Jean- ...Authors: Alpay B Seven / Ximena Barros-Álvarez / Marine de Lapeyrière / Makaía M Papasergi-Scott / Michael J Robertson / Chensong Zhang / Robert M Nwokonko / Yang Gao / Justin G Meyerowitz / Jean-Philippe Rocher / Dominik Schelshorn / Brian K Kobilka / Jesper M Mathiesen / Georgios Skiniotis /
Abstract: Family C G-protein-coupled receptors (GPCRs) operate as obligate dimers with extracellular domains that recognize small ligands, leading to G-protein activation on the transmembrane (TM) domains of ...Family C G-protein-coupled receptors (GPCRs) operate as obligate dimers with extracellular domains that recognize small ligands, leading to G-protein activation on the transmembrane (TM) domains of these receptors by an unknown mechanism. Here we show structures of homodimers of the family C metabotropic glutamate receptor 2 (mGlu2) in distinct functional states and in complex with heterotrimeric G. Upon activation of the extracellular domain, the two transmembrane domains undergo extensive rearrangement in relative orientation to establish an asymmetric TM6-TM6 interface that promotes conformational changes in the cytoplasmic domain of one protomer. Nucleotide-bound G can be observed pre-coupled to inactive mGlu2, but its transition to the nucleotide-free form seems to depend on establishing the active-state TM6-TM6 interface. In contrast to family A and B GPCRs, G-protein coupling does not involve the cytoplasmic opening of TM6 but is facilitated through the coordination of intracellular loops 2 and 3, as well as a critical contribution from the C terminus of the receptor. The findings highlight the synergy of global and local conformational transitions to facilitate a new mode of G-protein activation.
History
DepositionMay 13, 2021-
Header (metadata) releaseJul 7, 2021-
Map releaseJul 7, 2021-
UpdateJul 28, 2021-
Current statusJul 28, 2021Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.5
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.5
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  • Surface view with fitted model
  • Atomic models: PDB-7mts
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_23996.png

Downloads & links

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Map

FileDownload / File: emd_23996.map.gz / Format: CCP4 / Size: 343 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationComposite CryoEM Map of mGlu2 - Heterotrimeric Gi Complex
Voxel sizeX=Y=Z: 0.8677 Å
Density
Contour LevelBy EMDB: 0.5 / Movie #1: 0.5
Minimum - Maximum0.0 - 2.579004
Average (Standard dev.)0.0035267398 (±0.03753671)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions448448448
Spacing448448448
CellA=B=C: 388.72958 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.867700892857140.867700892857140.86770089285714
M x/y/z448448448
origin x/y/z0.0000.0000.000
length x/y/z388.730388.730388.730
α/β/γ90.00090.00090.000
start NX/NY/NZ-210-210-210
NX/NY/NZ420420420
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS448448448
D min/max/mean0.0002.5790.004

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Supplemental data

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Additional map: Local and focused refinement of mGlu2 VFT and CRD domains

Fileemd_23996_additional_1.map
AnnotationLocal and focused refinement of mGlu2 VFT and CRD domains
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Local and focused refinement of G-beta-gamma

Fileemd_23996_additional_2.map
AnnotationLocal and focused refinement of G-beta-gamma
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Local and focused refinement of mGlu2 CRD and 7TM domains

Fileemd_23996_additional_3.map
AnnotationLocal and focused refinement of mGlu2 CRD and 7TM domains
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Local and focused refinement of mGlu2 7TM domain and G-alpha-i

Fileemd_23996_additional_4.map
AnnotationLocal and focused refinement of mGlu2 7TM domain and G-alpha-i
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : mGlu2 - Heterotrimeric Gi complex

EntireName: mGlu2 - Heterotrimeric Gi complex
Components
  • Complex: mGlu2 - Heterotrimeric Gi complex
    • Protein or peptide: Metabotropic glutamate receptor 2
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
  • Ligand: 2-methoxy-6-propyl-N-(2-{4-[(1H-tetrazol-5-yl)methoxy]phenyl}ethyl)thieno[2,3-d]pyrimidin-4-amine
  • Ligand: GLUTAMIC ACID
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose

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Supramolecule #1: mGlu2 - Heterotrimeric Gi complex

SupramoleculeName: mGlu2 - Heterotrimeric Gi complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Details: Heterotrimeric G protein coupled metabotropic glutamate receptor 2 bound to Ago-PAM ADX55164 and L-Glutamate
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
Molecular weightTheoretical: 277 KDa

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Macromolecule #1: Metabotropic glutamate receptor 2

MacromoleculeName: Metabotropic glutamate receptor 2 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 93.932445 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: AEGPAKKVLT LEGDLVLGGL FPVHQKGGPA EDCGPVNEHR GIQRLEAMLF ALDRINRDPH LLPGVRLGAH ILDSCSKDTH ALEQALDFV RASLSRGADG SRHICPDGSY ATHGDAPTAI TGVIGGSYSD VSIQVANLLR LFQIPQISYA STSAKLSDKS R YDYFARTV ...String:
AEGPAKKVLT LEGDLVLGGL FPVHQKGGPA EDCGPVNEHR GIQRLEAMLF ALDRINRDPH LLPGVRLGAH ILDSCSKDTH ALEQALDFV RASLSRGADG SRHICPDGSY ATHGDAPTAI TGVIGGSYSD VSIQVANLLR LFQIPQISYA STSAKLSDKS R YDYFARTV PPDFFQAKAM AEILRFFNWT YVSTVASEGD YGETGIEAFE LEARARNICV ATSEKVGRAM SRAAFEGVVR AL LQKPSAR VAVLFTRSED ARELLAASQR LNASFTWVAS DGWGALESVV AGSEGAAEGA ITIELASYPI SDFASYFQSL DPW NNSRNP WFREFWEQRF RCSFRQRDCA AHSLRAVPFE QESKIMFVVN AVYAMAHALH NMHRALCPNT TRLCDAMRPV NGRR LYKDF VLNVKFDAPF RPADTHNEVR FDRFGDGIGR YNIFTYLRAG SGRYRYQKVG YWAEGLTLDT SLIPWASPSA GPLPA SRCS EPCLQNEVKS VQPGEVCCWL CIPCQPYEYR LDEFTCADCG LGYWPNASLT GCFELPQEYI RWGDAWAVGP VTIACL GAL ATLFVLGVFV RHNATPVVKA SGRELCYILL GGVFLCYCMT FIFIAKPSTA VCTLRRLGLG TAFSVCYSAL LTKTNRI AR IFGGAREGAQ RPRFISPASQ VAICLALISG QLLIVVAWLV VEAPGTGKET APERREVVTL RCNHRDASML GSLAYNVL L IALCTLYAFK TRKCPENFNE AKFIGFTMYT TCIIWLAFLP IFYVTSSDYR VQTTTMCVSV SLSGSVVLGC LFAPKLHII LFQPQKNVVS HRAPTSRFGS AAARASSSLG QGSGSQFVPT VCNGREVVDS TTSSL

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Macromolecule #2: Guanine nucleotide-binding protein G(i) subunit alpha-1

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-1
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.415031 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKSTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI ...String:
MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKSTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI PTQQDVLRTR VKTTGIVETH FTFKDLHFKM FDVGGQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHESM KLFDSICNNK WFTDTSIILF LNKKDLFEEK IKKSPLTICY PEYAGSNTYE EAAAYIQCQF EDLNKRKDTK EIY THFTCA TDTKNVQFVF DAVTDVIIKN NLKDCGLF

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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 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.342785 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: GSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKLI IWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC RFLDDNQIVT S SGDTTCAL ...String:
GSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKLI IWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC RFLDDNQIVT S SGDTTCAL WDIETGQQTT TFTGHTGDVM SLSLAPDTRL FVSGACDASA KLWDVREGMC RQTFTGHESD INAICFFPNG NA FATGSDD ATCRLFDLRA DQELMTYSHD NIICGITSVS FSKSGRLLLA GYDDFNCNVW DALKADRAGV LAGHDNRVSC LGV TDDGMA VATGSWDSFL KIWN

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Macromolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
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: Spodoptera frugiperda (fall armyworm)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

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Macromolecule #5: 2-methoxy-6-propyl-N-(2-{4-[(1H-tetrazol-5-yl)methoxy]phenyl}ethy...

MacromoleculeName: 2-methoxy-6-propyl-N-(2-{4-[(1H-tetrazol-5-yl)methoxy]phenyl}ethyl)thieno[2,3-d]pyrimidin-4-amine
type: ligand / ID: 5 / Number of copies: 1 / Formula: ZQY
Molecular weightTheoretical: 425.507 Da
Chemical component information

ChemComp-ZQY:
2-methoxy-6-propyl-N-(2-{4-[(1H-tetrazol-5-yl)methoxy]phenyl}ethyl)thieno[2,3-d]pyrimidin-4-amine

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Macromolecule #6: GLUTAMIC ACID

MacromoleculeName: GLUTAMIC ACID / type: ligand / ID: 6 / Number of copies: 2 / Formula: GLU
Molecular weightTheoretical: 147.129 Da
Chemical component information

ChemComp-GLU:
GLUTAMIC ACID

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Macromolecule #7: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 7 / Number of copies: 2 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

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

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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
GridModel: Quantifoil R1.2/1.3 / Support film - Material: GOLD / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Detector mode: COUNTING / Average electron dose: 1.3 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 3.2) / Details: A composite map of four locally refined maps. / Number images used: 799323
Initial angle assignmentType: OTHER
Final angle assignmentType: OTHER

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