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- PDB-7t5q: Cryo-EM Structure of a Transition State of Arp2/3 Complex Activation -

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Basic information

Entry
Database: PDB / ID: 7t5q
TitleCryo-EM Structure of a Transition State of Arp2/3 Complex Activation
Components
  • (Actin-related protein ...) x 7
  • (F-actin-capping protein subunit ...) x 2
  • Actin, alpha skeletal muscle
KeywordsCONTRACTILE PROTEIN / actin / ATPase / actin related protein / arp / cytoskeleton / Arp2-3 complex / actin nucleation / actin branching / CapZ
Function / homology
Function and homology information


negative regulation of membrane tubulation / muscle cell projection membrane / spindle localization / positive regulation of clathrin-dependent endocytosis / EPHB-mediated forward signaling / Regulation of actin dynamics for phagocytic cup formation / RHO GTPases Activate WASPs and WAVEs / Arp2/3 protein complex / Arp2/3 complex-mediated actin nucleation / negative regulation of lymphocyte migration ...negative regulation of membrane tubulation / muscle cell projection membrane / spindle localization / positive regulation of clathrin-dependent endocytosis / EPHB-mediated forward signaling / Regulation of actin dynamics for phagocytic cup formation / RHO GTPases Activate WASPs and WAVEs / Arp2/3 protein complex / Arp2/3 complex-mediated actin nucleation / negative regulation of lymphocyte migration / actin nucleation / F-actin capping protein complex / WASH complex / vesicle transport along actin filament / sperm head-tail coupling apparatus / actin cap / vesicle organization / regulation of actin filament polymerization / vesicle budding from membrane / Clathrin-mediated endocytosis / barbed-end actin filament capping / cell junction assembly / dendritic spine morphogenesis / actin polymerization or depolymerization / protein-containing complex localization / RHOD GTPase cycle / regulation of cell morphogenesis / RHOF GTPase cycle / COPI-independent Golgi-to-ER retrograde traffic / regulation of postsynapse organization / positive regulation of filopodium assembly / Sensory processing of sound by inner hair cells of the cochlea / lamellipodium assembly / Neutrophil degranulation / cytoskeletal motor activator activity / myosin heavy chain binding / tropomyosin binding / cortical cytoskeleton / troponin I binding / filamentous actin / mesenchyme migration / actin filament bundle / brush border / actin filament bundle assembly / Advanced glycosylation endproduct receptor signaling / skeletal muscle myofibril / striated muscle thin filament / skeletal muscle thin filament assembly / actin monomer binding / cilium assembly / positive regulation of double-strand break repair via homologous recombination / stress fiber / COPI-mediated anterograde transport / skeletal muscle fiber development / positive regulation of lamellipodium assembly / titin binding / actin filament polymerization / cytoskeleton organization / MHC class II antigen presentation / Gene and protein expression by JAK-STAT signaling after Interleukin-12 stimulation / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / hippocampal mossy fiber to CA3 synapse / sarcomere / cell projection / filopodium / actin filament / response to bacterium / Schaffer collateral - CA1 synapse / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / structural constituent of cytoskeleton / calcium-dependent protein binding / actin filament binding / cell migration / lamellipodium / actin cytoskeleton / regulation of protein localization / site of double-strand break / actin binding / Factors involved in megakaryocyte development and platelet production / cell body / actin cytoskeleton organization / cell cortex / protein-containing complex assembly / cytoplasmic vesicle / cytoskeleton / hydrolase activity / neuron projection / postsynaptic density / cadherin binding / protein domain specific binding / cell division / synapse / calcium ion binding / positive regulation of gene expression / glutamatergic synapse / magnesium ion binding / positive regulation of transcription by RNA polymerase II / extracellular exosome / extracellular region / ATP binding
Similarity search - Function
Yope Regulator; Chain: A, - #20 / Actin nucleation-promoting factor WAS, C-terminal / WASP family, EVH1 domain / Actin-related protein 2/3 complex subunit 5 / ARP2/3 complex 16 kDa subunit (p16-Arc) / Actin-related protein 2/3 complex subunit 2 / Actin-related protein 2/3 complex subunit 3 / Actin-related protein 2/3 complex subunit 4 / Actin-related protein 2/3 complex subunit 1 / Arp2/3 complex subunit 2/4 ...Yope Regulator; Chain: A, - #20 / Actin nucleation-promoting factor WAS, C-terminal / WASP family, EVH1 domain / Actin-related protein 2/3 complex subunit 5 / ARP2/3 complex 16 kDa subunit (p16-Arc) / Actin-related protein 2/3 complex subunit 2 / Actin-related protein 2/3 complex subunit 3 / Actin-related protein 2/3 complex subunit 4 / Actin-related protein 2/3 complex subunit 1 / Arp2/3 complex subunit 2/4 / Actin-related protein 2/3 complex subunit 5 superfamily / Actin-related protein 2/3 complex subunit 3 superfamily / Arp2/3 complex, 34 kD subunit p34-Arc / ARP2/3 complex ARPC3 (21 kDa) subunit / ARP2/3 complex 20 kDa subunit (ARPC4) / F-actin-capping protein subunit beta / F-actin capping protein, beta subunit, conserved site / F-actin-capping protein subunit beta, N-terminal domain / F-actin capping protein, beta subunit / F-actin capping protein beta subunit signature. / Yope Regulator; Chain: A, / Wiskott Aldrich syndrome homology region 2 / F-actin capping protein, alpha subunit, conserved site / F-actin capping protein alpha subunit signature 1. / F-actin capping protein alpha subunit signature 2. / F-actin-capping protein subunit alpha / F-actin-capping protein subunit alpha/beta / F-actin-capping protein subunit alpha/beta, domain 2 / F-actin capping protein, alpha subunit, domain 1 / F-actin capping protein alpha subunit / WH2 motif / WH1/EVH1 domain / WH1 domain / WH1 domain profile. / WASP homology region 1 / WH2 domain / WH2 domain profile. / CRIB domain superfamily / P21-Rho-binding domain / CRIB domain profile. / P21-Rho-binding domain / CRIB domain / Actins signature 1. / Actin, conserved site / Actins signature 2. / Actin/actin-like conserved site / Actins and actin-related proteins signature. / Actin / Actin family / Actin / YVTN repeat-like/Quinoprotein amine dehydrogenase / 7 Propeller / Methylamine Dehydrogenase; Chain H / ATPase, nucleotide binding domain / PH-like domain superfamily / WD domain, G-beta repeat / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / 2-Layer Sandwich / Mainly Beta / Alpha Beta
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / ADENOSINE-5'-TRIPHOSPHATE / Actin-related protein 2 / F-actin-capping protein subunit beta / F-actin-capping protein subunit alpha-1 / Actin-related protein 3 / Actin, alpha skeletal muscle / Actin-related protein 2/3 complex subunit 4 / Actin-related protein 2/3 complex subunit 1A / Actin-related protein 2/3 complex subunit 2 ...ADENOSINE-5'-DIPHOSPHATE / ADENOSINE-5'-TRIPHOSPHATE / Actin-related protein 2 / F-actin-capping protein subunit beta / F-actin-capping protein subunit alpha-1 / Actin-related protein 3 / Actin, alpha skeletal muscle / Actin-related protein 2/3 complex subunit 4 / Actin-related protein 2/3 complex subunit 1A / Actin-related protein 2/3 complex subunit 2 / Actin-related protein 2/3 complex subunit 5 / Actin-related protein 2/3 complex subunit 3 / Actin nucleation-promoting factor WASL
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
Bos taurus (domestic cattle)
Oryctolagus cuniculus (rabbit)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsRebowski, G. / van Eeuwen, T. / Boczkowska, M. / Dominguez, R.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01-GM07391 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)T32-GM008275 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)F31-HL146077 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: Transition State of Arp2/3 Complex Activation by Actin-Bound Dimeric Nucleation-Promoting Factor.
Authors: Trevor van Eeuwen / Malgorzata Boczkowska / Grzegorz Rebowski / Peter J Carman / Fred E Fregoso / Roberto Dominguez /
Abstract: Arp2/3 complex generates branched actin networks that drive fundamental processes such as cell motility and cytokinesis. The complex comprises seven proteins, including actin-related proteins (Arps) ...Arp2/3 complex generates branched actin networks that drive fundamental processes such as cell motility and cytokinesis. The complex comprises seven proteins, including actin-related proteins (Arps) 2 and 3 and five scaffolding proteins (ArpC1-ArpC5) that mediate interactions with a pre-existing (mother) actin filament at the branch junction. Arp2/3 complex exists in two main conformations, inactive with the Arps interacting end-to-end and active with the Arps interacting side-by-side like subunits of the short-pitch helix of the actin filament. Several cofactors drive the transition toward the active state, including ATP binding to the Arps, WASP-family nucleation-promoting factors (NPFs), actin monomers, and binding of Arp2/3 complex to the mother filament. The precise contribution of each cofactor to activation is poorly understood. We report the 3.32-Å resolution cryo-electron microscopy structure of a transition state of Arp2/3 complex activation with bound constitutively dimeric NPF. Arp2/3 complex-binding region of the NPF N-WASP was fused C-terminally to the α and β subunits of the CapZ heterodimer. One arm of the NPF dimer binds Arp2 and the other binds actin and Arp3. The conformation of the complex is intermediate between those of inactive and active Arp2/3 complex. Arp2, Arp3, and actin also adopt intermediate conformations between monomeric (G-actin) and filamentous (F-actin) states, but only actin hydrolyzes ATP. In solution, the transition complex is kinetically shifted toward the short-pitch conformation and has higher affinity for F-actin than inactive Arp2/3 complex. The results reveal how all the activating cofactors contribute in a coordinated manner toward Arp2/3 complex activation.
History
DepositionDec 13, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 14, 2023Provider: repository / Type: Initial release
Revision 1.1Aug 2, 2023Group: Structure summary / Category: struct / Item: _struct.title
Revision 1.2Oct 23, 2024Group: Data collection / Database references ...Data collection / Database references / Refinement description / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / citation / citation_author / em_3d_fitting_list / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_3d_fitting_list.initial_refinement_model_id / _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Actin-related protein 3
B: Actin-related protein 2
C: Actin-related protein 2/3 complex subunit 1A
D: Actin-related protein 2/3 complex subunit 2
E: Actin-related protein 2/3 complex subunit 3
F: Actin-related protein 2/3 complex subunit 4
G: Actin-related protein 2/3 complex subunit 5
H: Actin, alpha skeletal muscle
I: F-actin-capping protein subunit alpha-1/Actin nucleation-promoting factor WASL chimera
J: F-actin-capping protein subunit beta/Actin nucleation-promoting factor WASL chimera
hetero molecules


Theoretical massNumber of molelcules
Total (without water)345,22516
Polymers343,71110
Non-polymers1,5146
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: native gel electrophoresis
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Actin-related protein ... , 7 types, 7 molecules ABCDEFG

#1: Protein Actin-related protein 3 / Actin-2 / Actin-like protein 3


Mass: 47428.031 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Bos taurus (domestic cattle) / References: UniProt: P61157
#2: Protein Actin-related protein 2 / Actin-like protein 2


Mass: 44818.711 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Bos taurus (domestic cattle) / References: UniProt: A7MB62
#3: Protein Actin-related protein 2/3 complex subunit 1A


Mass: 41594.238 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Bos taurus (domestic cattle) / References: UniProt: Q1JP79
#4: Protein Actin-related protein 2/3 complex subunit 2 / Arp2/3 complex 34 kDa subunit / p34-ARC


Mass: 34402.043 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Bos taurus (domestic cattle) / References: UniProt: Q3MHR7
#5: Protein Actin-related protein 2/3 complex subunit 3 / Arp2/3 complex 21 kDa subunit / p21-ARC


Mass: 20572.666 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Bos taurus (domestic cattle) / References: UniProt: Q3T035
#6: Protein Actin-related protein 2/3 complex subunit 4 / Arp2/3 complex 20 kDa subunit / p20-ARC


Mass: 19697.047 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Bos taurus (domestic cattle) / References: UniProt: Q148J6
#7: Protein Actin-related protein 2/3 complex subunit 5 / Arp2/3 complex 16 kDa subunit / p16-ARC


Mass: 16251.308 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Bos taurus (domestic cattle) / References: UniProt: Q3SYX9

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Protein , 1 types, 1 molecules H

#8: Protein Actin, alpha skeletal muscle / Alpha-actin-1


Mass: 41875.633 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Oryctolagus cuniculus (rabbit) / References: UniProt: P68135

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F-actin-capping protein subunit ... , 2 types, 2 molecules IJ

#9: Protein F-actin-capping protein subunit alpha-1/Actin nucleation-promoting factor WASL chimera / CapZ alpha-1 / Neural Wiskott-Aldrich syndrome protein / N-WASP


Mass: 39600.566 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human), (gene. exp.) Mus musculus (house mouse)
Gene: CAPZA1, Wasl / Production host: Escherichia coli (E. coli) / References: UniProt: P52907, UniProt: Q91YD9
#10: Protein F-actin-capping protein subunit beta/Actin nucleation-promoting factor WASL chimera / CapZ beta / Neural Wiskott-Aldrich syndrome protein / N-WASP


Mass: 37470.754 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human), (gene. exp.) Mus musculus (house mouse)
Gene: CAPZB, Wasl / Production host: Escherichia coli (E. coli) / References: UniProt: P47756, UniProt: Q91YD9

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Non-polymers , 3 types, 6 molecules

#11: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: Mg
#12: Chemical ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Comment: ATP, energy-carrying molecule*YM
#13: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Comment: ADP, energy-carrying molecule*YM

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Details

Has ligand of interestN
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSourceDetails
1bovine Arp2/3 complex and Actin, CapZCOMPLEX#1-#100MULTIPLE SOURCES
2bovine Arp2/3COMPLEX#1-#71NATURAL
3Actin skeletal muscleCOMPLEX#81NATURAL
4F-actin-capping proteinCOMPLEX#9-#101RECOMBINANTsubunit alpha and beta
Molecular weightValue: 0.2489 MDa / Experimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-IDOrgan
22Bos taurus (domestic cattle)9913brain
33Oryctolagus cuniculus (rabbit)9986
44Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
13Escherichia coli (E. coli)562
24Escherichia coli (E. coli)562
Buffer solutionpH: 7
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPESC8H18N2O4S1
2100 mMsodium chlorideNaCl1
31 mMDithiothreitolHSCH2CH(OH)CH(OH)CH2SH1
4.2 mMAdenosine triphosphate disodium saltC10H14N5O13P3Na21
5.2 mMmagnesium chlorideMgCl21
SpecimenConc.: 5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: This sample was monodisperse.
VitrificationInstrument: LEICA EM CPC / Cryogen name: ETHANE
Details: Grids were manually blotted for 3 seconds with Whatman 41 filter paper and manually plunged using a Leica EM CPC manual plunger.

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Details: Data were collected in super-resolution mode with an illuminated area of 1.01 um, nominal dose of 40 e-/A^2, a dose rate of 4.87 e-/s/pixel, and 2 or 5 exposures per hole by image shift.
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal magnification: 165000 X / Nominal defocus max: 3500 nm / Nominal defocus min: 1500 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 2.6 sec. / Electron dose: 50 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 9661
EM imaging opticsEnergyfilter slit width: 20 eV
Image scansWidth: 5760 / Height: 4092 / Movie frames/image: 40 / Used frames/image: 1-40

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
EM software
IDNameVersionCategoryDetails
1cryoSPARC2.12.4particle selection
2Latitudeimage acquisition
4CTFFIND4.1.13CTF correction
5cryoSPARC2.12.4CTF correction
8Cootmodel fitting
10PHENIXmodel refinement
11RELION3.1initial Euler assignment
12RELION3.1final Euler assignment
13RELION3.1classification
14cryoSPARC43D reconstructionnon-uniform refinement
Image processingDetails: Super resolution mode; micrographs binned during motion correction
CTF correctionDetails: CTF correction was done in cryoSPARC for intial 2D classification and then repeated in CTFFIND4 (Relion) for classification and final reconstruction.
Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 4485066 / Details: Particles autopicked in cryoSPARC
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 269760 / Algorithm: FOURIER SPACE / Details: Composite map after multibody refinement / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingB value: 132 / Protocol: FLEXIBLE FIT / Space: REAL / Target criteria: correlation
Atomic model buildingPDB-ID: 4JD2
Accession code: 4JD2 / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00522141
ELECTRON MICROSCOPYf_angle_d0.83429965
ELECTRON MICROSCOPYf_dihedral_angle_d6.0432946
ELECTRON MICROSCOPYf_chiral_restr0.0493295
ELECTRON MICROSCOPYf_plane_restr0.0063845

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