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- EMDB-52432: Native human P-eIF2-eIF2B complex -

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Basic information

Entry
Database: EMDB / ID: EMD-52432
TitleNative human P-eIF2-eIF2B complex
Map data
Sample
  • Complex: P-eIF2-eIF2B complex
    • Protein or peptide: Translation initiation factor eIF-2B subunit gamma
    • Protein or peptide: Eukaryotic translation initiation factor 2 subunit 1
    • Protein or peptide: Translation initiation factor eIF2B subunit epsilon
    • Protein or peptide: Translation initiation factor eIF2B subunit beta
    • Protein or peptide: Translation initiation factor eIF-2B subunit alpha
    • Protein or peptide: Translation initiation factor eIF-2B subunit delta
KeywordsTranslation / phosphorylation / Eukaryotic Initiation Factor-2B / Eukaryotic Initiation Factor-2
Function / homology
Function and homology information


translation initiation ternary complex / regulation of translation in response to endoplasmic reticulum stress / glial limiting end-foot / HRI-mediated signaling / eukaryotic translation initiation factor 2B complex / response to manganese-induced endoplasmic reticulum stress / Cellular response to mitochondrial stress / positive regulation of type B pancreatic cell apoptotic process / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP ...translation initiation ternary complex / regulation of translation in response to endoplasmic reticulum stress / glial limiting end-foot / HRI-mediated signaling / eukaryotic translation initiation factor 2B complex / response to manganese-induced endoplasmic reticulum stress / Cellular response to mitochondrial stress / positive regulation of type B pancreatic cell apoptotic process / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP / negative regulation of translational initiation in response to stress / PERK-mediated unfolded protein response / PERK regulates gene expression / response to kainic acid / eukaryotic translation initiation factor 2 complex / cytoplasmic translational initiation / regulation of translational initiation in response to stress / guanyl-nucleotide exchange factor complex / astrocyte development / eukaryotic 48S preinitiation complex / astrocyte differentiation / oligodendrocyte development / regulation of translational initiation / Formation of the ternary complex, and subsequently, the 43S complex / Ribosomal scanning and start codon recognition / Translation initiation complex formation / positive regulation of translational initiation / Response of EIF2AK4 (GCN2) to amino acid deficiency / GTP hydrolysis and joining of the 60S ribosomal subunit / L13a-mediated translational silencing of Ceruloplasmin expression / response to glucose / ovarian follicle development / mitophagy / translation initiation factor binding / translation initiation factor activity / myelination / stress granule assembly / cellular response to amino acid starvation / response to endoplasmic reticulum stress / guanyl-nucleotide exchange factor activity / central nervous system development / hippocampus development / translational initiation / response to peptide hormone / PKR-mediated signaling / ABC-family proteins mediated transport / cytoplasmic stress granule / cellular response to UV / T cell receptor signaling pathway / regulation of translation / cellular response to heat / ribosome binding / response to heat / cellular response to oxidative stress / positive regulation of apoptotic process / synapse / GTP binding / mitochondrion / RNA binding / extracellular exosome / ATP binding / identical protein binding / nucleus / membrane / plasma membrane / cytoplasm / cytosol
Similarity search - Function
Translation initiation factor eIF-2B subunit alpha, N-terminal / : / Translation initiation factor eIF-2B subunit epsilon, N-terminal / Translation initiation factor eIF-2B subunit epsilon, W2 domain / : / : / : / EIF2B subunit epsilon LbH domain / Initiation factor 2B-related / Initiation factor 2B-like, C-terminal ...Translation initiation factor eIF-2B subunit alpha, N-terminal / : / Translation initiation factor eIF-2B subunit epsilon, N-terminal / Translation initiation factor eIF-2B subunit epsilon, W2 domain / : / : / : / EIF2B subunit epsilon LbH domain / Initiation factor 2B-related / Initiation factor 2B-like, C-terminal / Initiation factor 2 subunit family / eIF4-gamma/eIF5/eIF2-epsilon / Domain at the C-termini of GCD6, eIF-2B epsilon, eIF-4 gamma and eIF-5 / W2 domain / W2 domain profile. / Translation initiation factor 2, alpha subunit / Translation initiation factor 2, alpha subunit, middle domain superfamily / Translation initiation factor 2, alpha subunit, C-terminal / IF2a, S1-like domain / Eukaryotic translation initiation factor 2 alpha subunit / Nucleotidyl transferase domain / Nucleotidyl transferase / NagB/RpiA transferase-like / Trimeric LpxA-like superfamily / S1 domain profile. / Ribosomal protein S1-like RNA-binding domain / S1 RNA binding domain / Nucleotide-diphospho-sugar transferases / S1 domain / Armadillo-type fold / Nucleic acid-binding, OB-fold
Similarity search - Domain/homology
Eukaryotic translation initiation factor 2 subunit 1 / Translation initiation factor eIF2B subunit beta / Translation initiation factor eIF2B subunit epsilon / Translation initiation factor eIF2B subunit alpha / Translation initiation factor eIF2B subunit gamma / Translation initiation factor eIF2B subunit delta
Similarity search - Component
Biological speciesExpi293 cells (human) / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.04 Å
AuthorsDe Miguel C / Thorkelsson SR / Wang C / Bertolotti A
Funding support United Kingdom, 2 items
OrganizationGrant numberCountry
Medical Research Council (MRC, United Kingdom)MC_U105185860 United Kingdom
Wellcome Trust206367/Z/ 17/Z United Kingdom
CitationJournal: Science / Year: 2025
Title: PPP1R15B rescues eIF2B from inhibition by P-eIF2 in translation regulation
Authors: De Miguel C / Thorkelsson SR / Wang C / Bertolotti A
History
DepositionDec 27, 2024-
Header (metadata) releaseNov 19, 2025-
Map releaseNov 19, 2025-
UpdateNov 19, 2025-
Current statusNov 19, 2025Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_52432.png

Downloads & links

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Map

FileDownload / File: emd_52432.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.1 Å/pix.
x 400 pix.
= 440. Å		1.1 Å/pix.
x 400 pix.
= 440. Å		1.1 Å/pix.
x 400 pix.
= 440. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.2
Minimum - Maximum-0.81780833 - 1.7551703
Average (Standard dev.)0.00047343338 (±0.038876876)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 440.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_52432_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_52432_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_52432_half_map_2.map
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : P-eIF2-eIF2B complex

EntireName: P-eIF2-eIF2B complex
Components
  • Complex: P-eIF2-eIF2B complex
    • Protein or peptide: Translation initiation factor eIF-2B subunit gamma
    • Protein or peptide: Eukaryotic translation initiation factor 2 subunit 1
    • Protein or peptide: Translation initiation factor eIF2B subunit epsilon
    • Protein or peptide: Translation initiation factor eIF2B subunit beta
    • Protein or peptide: Translation initiation factor eIF-2B subunit alpha
    • Protein or peptide: Translation initiation factor eIF-2B subunit delta

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Supramolecule #1: P-eIF2-eIF2B complex

SupramoleculeName: P-eIF2-eIF2B complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Expi293 cells (human) / Location in cell: cytoplasm
Molecular weightTheoretical: 780 KDa

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Macromolecule #1: Translation initiation factor eIF-2B subunit gamma

MacromoleculeName: Translation initiation factor eIF-2B subunit gamma / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 50.30423 KDa
SequenceString: MEFQAVVMAV GGGSRMTDLT SSIPKPLLPV GNKPLIWYPL NLLERVGFEE VIVVTTRDVQ KALCAEFKMK MKPDIVCIPD DADMGTADS LRYIYPKLKT DVLVLSCDLI TDVALHEVVD LFRAYDASLA MLMRKGQDSI EPVPGQKGKK KAVEQRDFIG V DSTGKRLL ...String:
MEFQAVVMAV GGGSRMTDLT SSIPKPLLPV GNKPLIWYPL NLLERVGFEE VIVVTTRDVQ KALCAEFKMK MKPDIVCIPD DADMGTADS LRYIYPKLKT DVLVLSCDLI TDVALHEVVD LFRAYDASLA MLMRKGQDSI EPVPGQKGKK KAVEQRDFIG V DSTGKRLL FMANEADLDE ELVIKGSILQ KHPRIRFHTG LVDAHLYCLK KYIVDFLMEN GSITSIRSEL IPYLVRKQFS SA SSQQGQE EKEEDLKKKE LKSLDIYSFI KEANTLNLAP YDACWNACRG DRWEDLSRSQ VRCYVHIMKE GLCSRVSTLG LYM EANRQV PKLLSALCPE EPPVHSSAQI VSKHLVGVDS LIGPETQIGE KSSIKRSVIG SSCLIKDRVT ITNCLLMNSV TVEE GSNIQ GSVICNNAVI EKGADIKDCL IGSGQRIEAK AKRVNEVIVG NDQLMEI

UniProtKB: Translation initiation factor eIF2B subunit gamma

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Macromolecule #2: Eukaryotic translation initiation factor 2 subunit 1

MacromoleculeName: Eukaryotic translation initiation factor 2 subunit 1 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 36.241156 KDa
SequenceString: MPGLSCRFYQ HKFPEVEDVV MVNVRSIAEM GAYVSLLEYN NIEGMILLSE L(SEP)RRRIRSIN KLIRIGRNEC VVVIRV DKE KGYIDLSKRR VSPEEAIKCE DKFTKSKTVY SILRHVAEVL EYTKDEQLES LFQRTAWVFD DKYKRPGYGA YDAFKHA VS DPSILDSLDL ...String:
MPGLSCRFYQ HKFPEVEDVV MVNVRSIAEM GAYVSLLEYN NIEGMILLSE L(SEP)RRRIRSIN KLIRIGRNEC VVVIRV DKE KGYIDLSKRR VSPEEAIKCE DKFTKSKTVY SILRHVAEVL EYTKDEQLES LFQRTAWVFD DKYKRPGYGA YDAFKHA VS DPSILDSLDL NEDEREVLIN NINRRLTPQA VKIRADIEVA CYGYEGIDAV KEALRAGLNC STENMPIKIN LIAPPRYV M TTTTLERTEG LSVLSQAMAV IKEKIEEKRG VFNVQMEPKV VTDTDETELA RQMERLEREN AEVDGDDDAE EMEAKAED

UniProtKB: Eukaryotic translation initiation factor 2 subunit 1

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Macromolecule #3: Translation initiation factor eIF2B subunit epsilon

MacromoleculeName: Translation initiation factor eIF2B subunit epsilon / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 80.466609 KDa
SequenceString: MAAPVVAPPG VVVSRANKRS GAGPGGSGGG GARGAEEEPP PPLQAVLVAD SFDRRFFPIS KDQPRVLLPL ANVALIDYTL EFLTATGVQ ETFVFCCWKA AQIKEHLLKS KWCRPTSLNV VRIITSELYR SLGDVLRDVD AKALVRSDFL LVYGDVISNI N ITRALEEH ...String:
MAAPVVAPPG VVVSRANKRS GAGPGGSGGG GARGAEEEPP PPLQAVLVAD SFDRRFFPIS KDQPRVLLPL ANVALIDYTL EFLTATGVQ ETFVFCCWKA AQIKEHLLKS KWCRPTSLNV VRIITSELYR SLGDVLRDVD AKALVRSDFL LVYGDVISNI N ITRALEEH RLRRKLEKNV SVMTMIFKES SPSHPTRCHE DNVVVAVDST TNRVLHFQKT QGLRRFAFPL SLFQGSSDGV EV RYDLLDC HISICSPQVA QLFTDNFDYQ TRDDFVRGLL VNEEILGNQI HMHVTAKEYG ARVSNLHMYS AVCADVIRRW VYP LTPEAN FTDSTTQSCT HSRHNIYRGP EVSLGHGSIL EENVLLGSGT VIGSNCFITN SVIGPGCHIG DNVVLDQTYL WQGV RVAAG AQIHQSLLCD NAEVKERVTL KPRSVLTSQV VVGPNITLPE GSVISLHPPD AEEDEDDGEF SDDSGADQEK DKVKM KGYN PAEVGAAGKG YLWKAAGMNM EEEEELQQNL WGLKINMEEE SESESEQSMD SEEPDSRGGS PQMDDIKVFQ NEVLGT LQR GKEENISCDN LVLEINSLKY AYNISLKEVM QVLSHVVLEF PLQQMDSPLD SSRYCALLLP LLKAWSPVFR NYIKRAA DH LEALAAIEDF FLEHEALGIS MAKVLMAFYQ LEILAEETIL SWFSQRDTTD KGQQLRKNQQ LQRFIQWLKE AEEESSED D

UniProtKB: Translation initiation factor eIF2B subunit epsilon

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Macromolecule #4: Translation initiation factor eIF2B subunit beta

MacromoleculeName: Translation initiation factor eIF2B subunit beta / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.039547 KDa
SequenceString: MPGSAAKGSE LSERIESFVE TLKRGGGPRS SEEMARETLG LLRQIITDHR WSNAGELMEL IRREGRRMTA AQPSETTVGN MVRRVLKII REEYGRLHGR SDESDQQESL HKLLTSGGLN EDFSFHYAQL QSNIIEAINE LLVELEGTME NIAAQALEHI H SNEVIMTI ...String:
MPGSAAKGSE LSERIESFVE TLKRGGGPRS SEEMARETLG LLRQIITDHR WSNAGELMEL IRREGRRMTA AQPSETTVGN MVRRVLKII REEYGRLHGR SDESDQQESL HKLLTSGGLN EDFSFHYAQL QSNIIEAINE LLVELEGTME NIAAQALEHI H SNEVIMTI GFSRTVEAFL KEAARKRKFH VIVAECAPFC QGHEMAVNLS KAGIETTVMT DAAIFAVMSR VNKVIIGTKT IL ANGALRA VTGTHTLALA AKHHSTPLIV CAPMFKLSPQ FPNEEDSFHK FVAPEEVLPF TEGDILEKVS VHCPVFDYVP PEL ITLFIS NIGGNAPSYI YRLMSELYHP DDHVL

UniProtKB: Translation initiation factor eIF2B subunit beta

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Macromolecule #5: Translation initiation factor eIF-2B subunit alpha

MacromoleculeName: Translation initiation factor eIF-2B subunit alpha / type: protein_or_peptide / ID: 5 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 33.754148 KDa
SequenceString: MDDKELIEYF KSQMKEDPDM ASAVAAIRTL LEFLKRDKGE TIQGLRANLT SAIETLCGVD SSVAVSSGGE LFLRFISLAS LEYSDYSKC KKIMIERGEL FLRRISLSRN KIADLCHTFI KDGATILTHA YSRVVLRVLE AAVAAKKRFS VYVTESQPDL S GKKMAKAL ...String:
MDDKELIEYF KSQMKEDPDM ASAVAAIRTL LEFLKRDKGE TIQGLRANLT SAIETLCGVD SSVAVSSGGE LFLRFISLAS LEYSDYSKC KKIMIERGEL FLRRISLSRN KIADLCHTFI KDGATILTHA YSRVVLRVLE AAVAAKKRFS VYVTESQPDL S GKKMAKAL CHLNVPVTVV LDAAVGYIME KADLVIVGAE GVVENGGIIN KIGTNQMAVC AKAQNKPFYV VAESFKFVRL FP LNQQDVP DKFKYKADTL KVAQTGQDLK EEHPWVDYTA PSLITLLFTD LGVLTPSAVS DELIKLYL

UniProtKB: Translation initiation factor eIF2B subunit alpha

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Macromolecule #6: Translation initiation factor eIF-2B subunit delta

MacromoleculeName: Translation initiation factor eIF-2B subunit delta / type: protein_or_peptide / ID: 6 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 57.640168 KDa
SequenceString: MAAVAVAVRE DSGSGMKAEL PPGPGAVGRE MTKEEKLQLR KEKKQQKKKR KEEKGAEPET GSAVSAAQCQ VGPTRELPES GIQLGTPRE KVPAGRSKAE LRAERRAKQE AERALKQARK GEQGGPPPKA SPSTAGETPS GVKRLPEYPQ VDDLLLRRLV K KPERQQVP ...String:
MAAVAVAVRE DSGSGMKAEL PPGPGAVGRE MTKEEKLQLR KEKKQQKKKR KEEKGAEPET GSAVSAAQCQ VGPTRELPES GIQLGTPRE KVPAGRSKAE LRAERRAKQE AERALKQARK GEQGGPPPKA SPSTAGETPS GVKRLPEYPQ VDDLLLRRLV K KPERQQVP TRKDYGSKVS LFSHLPQYSR QNSLTQFMSI PSSVIHPAMV RLGLQYSQGL VSGSNARCIA LLRALQQVIQ DY TTPPNEE LSRDLVNKLK PYMSFLTQCR PLSASMHNAI KFLNKEITSV GSSKREEEAK SELRAAIDRY VQEKIVLAAQ AIS RFAYQK ISNGDVILVY GCSSLVSRIL QEAWTEGRRF RVVVVDSRPW LEGRHTLRSL VHAGVPASYL LIPAASYVLP EVSK VLLGA HALLANGSVM SRVGTAQLAL VARAHNVPVL VCCETYKFCE RVQTDAFVSN ELDDPDDLQC KRGEHVALAN WQNHA SLRL LNLVYDVTPP ELVDLVITEL GMIPCSSVPV VLRVKSSDQ

UniProtKB: Translation initiation factor eIF2B subunit delta

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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
Component:
ConcentrationFormulaName
20.0 mMHEPES2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid
150.0 mMKClpotassium chloride
1.0 mMTCEPtris(2-carboxyethyl)phosphine
GridModel: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - #0 - Film type ID: 1 / Support film - #0 - Material: GOLD / Support film - #0 - topology: HOLEY / Support film - #0 - Film thickness: 50 / Support film - #1 - Film type ID: 2 / Support film - #1 - Material: CARBON / Support film - #1 - topology: CONTINUOUS / Support film - #1 - Film thickness: 2 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 10 sec. / Details: 15mA
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: TFS FALCON 4i (4k x 4k) / Number real images: 9438 / 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 / Cs: 2.7 mm / Nominal defocus max: 2.4 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 75000
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: 1184000
CTF correctionSoftware - Name: CTFFIND (ver. 4) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Details: An ab initio model generated with Cryosparc's 'Ab-Initio Reconstruction' job
Final reconstructionNumber classes used: 200 / Applied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.04 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 326401
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final 3D classificationNumber classes: 200 / Software - Name: cryoSPARC

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Atomic model buiding 1

Initial modelChain - Source name: AlphaFold / Chain - Initial model type: in silico model
RefinementSpace: REAL
Output model

PDB-9hvd:
Native human P-eIF2-eIF2B complex

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