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- PDB-3j07: Model of a 24mer alphaB-crystallin multimer -

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Entry
Database: PDB / ID: 3j07
TitleModel of a 24mer alphaB-crystallin multimer
ComponentsAlpha-crystallin B chain
KeywordsCHAPERONE / sHSP
Function / homology
Function and homology information


microtubule polymerization or depolymerization / negative regulation of intracellular transport / apoptotic process involved in morphogenesis / cardiac myofibril / regulation of programmed cell death / tubulin complex assembly / structural constituent of eye lens / negative regulation of amyloid fibril formation / M band / lens development in camera-type eye ...microtubule polymerization or depolymerization / negative regulation of intracellular transport / apoptotic process involved in morphogenesis / cardiac myofibril / regulation of programmed cell death / tubulin complex assembly / structural constituent of eye lens / negative regulation of amyloid fibril formation / M band / lens development in camera-type eye / muscle organ development / actin filament bundle / HSF1-dependent transactivation / negative regulation of reactive oxygen species metabolic process / negative regulation of protein-containing complex assembly / stress-activated MAPK cascade / muscle contraction / synaptic membrane / response to hydrogen peroxide / negative regulation of cell growth / cellular response to gamma radiation / Z disc / unfolded protein binding / protein folding / response to estradiol / amyloid-beta binding / response to heat / protein refolding / microtubule binding / perikaryon / dendritic spine / lysosome / response to hypoxia / protein stabilization / axon / negative regulation of gene expression / negative regulation of DNA-templated transcription / protein-containing complex binding / negative regulation of apoptotic process / structural molecule activity / cell surface / protein homodimerization activity / protein-containing complex / mitochondrion / extracellular exosome / nucleoplasm / identical protein binding / nucleus / metal ion binding / cytosol / cytoplasm
Similarity search - Function
Alpha-crystallin B chain, ACD domain / Alpha-crystallin, N-terminal / Alpha crystallin A chain, N terminal / Alpha crystallin/Small heat shock protein, animal type / Immunoglobulin-like - #790 / Hsp20/alpha crystallin family / Small heat shock protein (sHSP) domain profile. / Alpha crystallin/Hsp20 domain / HSP20-like chaperone / Immunoglobulin-like ...Alpha-crystallin B chain, ACD domain / Alpha-crystallin, N-terminal / Alpha crystallin A chain, N terminal / Alpha crystallin/Small heat shock protein, animal type / Immunoglobulin-like - #790 / Hsp20/alpha crystallin family / Small heat shock protein (sHSP) domain profile. / Alpha crystallin/Hsp20 domain / HSP20-like chaperone / Immunoglobulin-like / Sandwich / Mainly Beta
Similarity search - Domain/homology
Alpha-crystallin B chain
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodSOLID-STATE NMR / SOLUTION SCATTERING / ELECTRON MICROSCOPY / single particle reconstruction / simulated annealing, molecular dynamics, torsion angle dynamics / negative staining / Resolution: 20 Å
AuthorsJehle, S. / Vollmar, B. / Bardiaux, B. / Dove, K.K. / Rajagopal, P. / Gonen, T. / Oschkinat, H. / Klevit, R.E.
Citation
Journal: Proc Natl Acad Sci U S A / Year: 2009
Title: The eye lens chaperone alpha-crystallin forms defined globular assemblies.
Authors: Jirka Peschek / Nathalie Braun / Titus M Franzmann / Yannis Georgalis / Martin Haslbeck / Sevil Weinkauf / Johannes Buchner /
Abstract: Alpha-crystallins are molecular chaperones that protect vertebrate eye lens proteins from detrimental protein aggregation. alphaB-Crystallin, 1 of the 2 alpha-crystallin isoforms, is also associated ...Alpha-crystallins are molecular chaperones that protect vertebrate eye lens proteins from detrimental protein aggregation. alphaB-Crystallin, 1 of the 2 alpha-crystallin isoforms, is also associated with myopathies and neuropathological diseases. Despite the importance of alpha-crystallins in protein homeostasis, only little is known about their quaternary structures because of their seemingly polydisperse nature. Here, we analyzed the structures of recombinant alpha-crystallins using biophysical methods. In contrast to previous reports, we show that alphaB-crystallin assembles into defined oligomers consisting of 24 subunits. The 3-dimensional (3D) reconstruction of alphaB-crystallin by electron microscopy reveals a sphere-like structure with large openings to the interior of the protein. alphaA-Crystallin forms, in addition to complexes of 24 subunits, also smaller oligomers and large clusters consisting of individual oligomers. This propensity might explain the previously reported polydisperse nature of alpha-crystallin.
#1: Journal: Nat Struct Mol Biol / Year: 2010
Title: Solid-state NMR and SAXS studies provide a structural basis for the activation of alphaB-crystallin oligomers.
Authors: Stefan Jehle / Ponni Rajagopal / Benjamin Bardiaux / Stefan Markovic / Ronald Kühne / Joseph R Stout / Victoria A Higman / Rachel E Klevit / Barth-Jan van Rossum / Hartmut Oschkinat /
Abstract: The small heat shock protein alphaB-crystallin (alphaB) contributes to cellular protection against stress. For decades, high-resolution structural studies on oligomeric alphaB have been confounded by ...The small heat shock protein alphaB-crystallin (alphaB) contributes to cellular protection against stress. For decades, high-resolution structural studies on oligomeric alphaB have been confounded by its polydisperse nature. Here, we present a structural basis of oligomer assembly and activation of the chaperone using solid-state NMR and small-angle X-ray scattering (SAXS). The basic building block is a curved dimer, with an angle of approximately 121 degrees between the planes of the beta-sandwich formed by alpha-crystallin domains. The highly conserved IXI motif covers a substrate binding site at pH 7.5. We observe a pH-dependent modulation of the interaction of the IXI motif with beta4 and beta8, consistent with a pH-dependent regulation of the chaperone function. N-terminal region residues Ser59-Trp60-Phe61 are involved in intermolecular interaction with beta3. Intermolecular restraints from NMR and volumetric restraints from SAXS were combined to calculate a model of a 24-subunit alphaB oligomer with tetrahedral symmetry.
History
DepositionApr 27, 2011Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 20, 2016Provider: repository / Type: Initial release
Revision 1.1Nov 23, 2016Group: Other
Revision 1.2Apr 24, 2019Group: Data collection
Category: em_image_scans / pdbx_nmr_software ...em_image_scans / pdbx_nmr_software / pdbx_soln_scatter / pdbx_soln_scatter_model
Item: _pdbx_nmr_software.name / _pdbx_soln_scatter_model.scatter_id
Revision 1.3May 1, 2024Group: Data collection / Database references / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_3d_fitting_list / pdbx_initial_refinement_model / pdbx_nmr_spectrometer
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type / _pdbx_nmr_spectrometer.model
Remark 0THIS ENTRY 3J07 CONTAINS A STRUCTURAL MODEL FIT TO AN ELECTRON MICROSCOPY MAP (EMD-1776) DETERMINED ...THIS ENTRY 3J07 CONTAINS A STRUCTURAL MODEL FIT TO AN ELECTRON MICROSCOPY MAP (EMD-1776) DETERMINED ORIGINALLY BY AUTHORS: J.PESCHEK, N.BRAUN, T.M.FRANZMANN, Y.GEORGALIS, M.HASLBECK, S.WEINKAUF, J.BUCHNER

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Structure visualization

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  • EMDB-1776
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Assembly

Deposited unit
A: Alpha-crystallin B chain
B: Alpha-crystallin B chain
C: Alpha-crystallin B chain
D: Alpha-crystallin B chain
E: Alpha-crystallin B chain
F: Alpha-crystallin B chain
G: Alpha-crystallin B chain
H: Alpha-crystallin B chain
I: Alpha-crystallin B chain
J: Alpha-crystallin B chain
K: Alpha-crystallin B chain
L: Alpha-crystallin B chain
M: Alpha-crystallin B chain
N: Alpha-crystallin B chain
O: Alpha-crystallin B chain
P: Alpha-crystallin B chain
Q: Alpha-crystallin B chain
R: Alpha-crystallin B chain
S: Alpha-crystallin B chain
T: Alpha-crystallin B chain
U: Alpha-crystallin B chain
V: Alpha-crystallin B chain
W: Alpha-crystallin B chain
X: Alpha-crystallin B chain


Theoretical massNumber of molelcules
Total (without water)484,60624
Polymers484,60624
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
NMR ensembles
DataCriteria
Number of conformers (submitted / calculated)1 / 200structures with the lowest energy
RepresentativeModel #1lowest energy

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Components

#1: Protein ...
Alpha-crystallin B chain / Alpha(B)-crystallin / Heat shock protein beta-5 / HspB5 / Renal carcinoma antigen NY-REN-27 / ...Alpha(B)-crystallin / Heat shock protein beta-5 / HspB5 / Renal carcinoma antigen NY-REN-27 / Rosenthal fiber component


Mass: 20191.930 Da / Num. of mol.: 24
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CRYAB, CRYA2 / Plasmid: pET16b / Production host: Escherichia coli (E. coli) / References: UniProt: P02511

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Experimental details

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Experiment

Experiment
Method
SOLID-STATE NMR
SOLUTION SCATTERING
ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction
NMR experiment
Conditions-IDExperiment-IDSolution-IDType
1112D 13C-13C PDSD
1222D 13C-13C PDSD
1332D 13C-13C CHHC
1432D 13C-13C PDSD
1513D 15N-13C-13C NCACX
1623D 15N-13C-13C NCACX
1713D 15N-13C-13C NCOCX
1823D 15N-13C-13C NCOCX
1942D 15N-13C TEDOR
11052D 15N-13C TEDOR
11142D 15N-13C NHHC
11252D 15N-13C NHHC
11342D 15N-13C PAIN
11432D 1H-13C INEPT

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Sample preparation

ComponentName: 24mer alphaB-crystallin multimer / Type: COMPLEX / Details: polydisperse oligomer
Buffer solutionpH: 7.4 / Details: 137mM NaCl, 2.7mM KCl, 12 mM PBS
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: YES / Vitrification applied: NO
EM stainingType: NEGATIVE / Material: Uranyl Acetate
CrystalDescription: HOMOLOGY MODELS AND SPARSE SOLID-STATE NMR DISTANCE RESTRAINTS WERE USED TO DEFINE THE SECONDARY STRUCTURE OF THE N-TERMINAL DOMAIN (UNP RESIDUES 1-65). THE RESTRAINTS ARE GIVEN IN THE ...Description: HOMOLOGY MODELS AND SPARSE SOLID-STATE NMR DISTANCE RESTRAINTS WERE USED TO DEFINE THE SECONDARY STRUCTURE OF THE N-TERMINAL DOMAIN (UNP RESIDUES 1-65). THE RESTRAINTS ARE GIVEN IN THE SUPPORTING INFORMATION OF THE PRIMARY CITATION. A 2D 1H-13C INEPT SPECTRUM WAS RECORDED AND ANALYZED IN ORDER TO IDENTIFY FLEXIBLE RESIDUES IN THE EXTREME N- AND C-TERMINI. SEVERAL MODELS WERE PREPARED WITH DIFFERENT POSITIONS OF FLEXIBLE RESIDUES IN THE INSIDE OF THE SPHERICAL MULTIMER TO FIT THE RADIUS OF GYRATION (RG) MEASURED BY SAXS. THE MODEL THAT BEST FIT THE RG WAS CHOSEN FOR DEPOSITION.
Details
Solution-IDContentsSolvent system
118 mg [1,3-13C]-glycerol; U-100% 15N alphaB-crystallin, 100% H2O100% H2O
217 mg [2-13C]-glycerol; U-100% 15N alphaB-crystallin, 100% H2O100% H2O
34 mg [U-100% 13C; U-100% 15N] alphaB-crystallin, 16 mg alphaB-crystallin, 100% H2O100% H2O
410 mg [U-100% 15N]; [U-100% 12C] 13C depleted alphaB-crystallin, 10 mg [2-13C]-glycerol; U-100% 15N alphaB-crystallin, 100% H2O100% H2O
510 mg [U-100% 15N]; [U-100% 12C] 13C depleted alphaB-crystallin, 10 mg [1,3-13C]-glycerol; U-100% 15N alphaB-crystallin, 100% H2O100% H2O
Sample
Conc. (mg/ml)ComponentIsotopic labelingSolution-ID
18 mg/mLalphaB-crystallin-1[1,3-13C]-glycerol; U-100% 15N1
17 mg/mLalphaB-crystallin-2[2-13C]-glycerol; U-100% 15N2
4 mg/mLalphaB-crystallin-3[U-100% 13C; U-100% 15N]3
16 mg/mLalphaB-crystallin-43
10 mg/mLalphaB-crystallin-5[U-100% 15N]; [U-100% 12C] 13C depleted4
10 mg/mLalphaB-crystallin-6[2-13C]-glycerol; U-100% 15N4
10 mg/mLalphaB-crystallin-7[U-100% 15N]; [U-100% 12C] 13C depleted5
10 mg/mLalphaB-crystallin-8[1,3-13C]-glycerol; U-100% 15N5
Sample conditionspH: 7.6 / Temperature: 270 K

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Data collection

MicroscopyModel: JEOL 100CX / Date: Feb 6, 2008
Electron gunElectron source: OTHER / Accelerating voltage: 100 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 50000 X / Nominal defocus max: 1200 nm / Nominal defocus min: 900 nm
Image recordingFilm or detector model: KODAK SO-163 FILM
NMR spectrometer
TypeManufacturerModelField strength (MHz)Spectrometer-ID
Bruker AvanceBrukerAVANCE4001
Bruker AvanceBrukerAVANCE6002
Bruker AvanceBrukerAVANCE7003
Bruker AvanceBrukerAVANCE9004
Soln scatterType: x-ray / Buffer name: phosphate, 100 mM NaCl / Conc. range: 0.1-12.6 mg/mL / Data reduction software list: CBF-PRIMUS / Detector type: 2D MAR345 / Mean guiner radius: 5.6 nm / Mean guiner radius esd: 0.2 nm / Num. of time frames: 1 / Protein length: 14.5 / Sample pH: 7.5 / Source beamline: X33 / Source class: Y / Source type: DESY HAMBURG X33 BEAMLINE / Temperature: 293 K

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Processing

SymmetryPoint symmetry: T (tetrahedral)
3D reconstructionResolution: 20 Å / Resolution method: FSC 0.5 CUT-OFF / Num. of particles: 2565 / Symmetry type: POINT
Atomic model buildingPDB-ID: 2KLR

2klr


Accession code: 2KLR / Source name: PDB / Type: experimental model
Refinement stepCycle: LAST
ProteinNucleic acidLigandSolventTotal
Num. atoms33912 0 0 0 33912
NMR software
NameVersionDeveloperClassification
TopSpinBruker Biospincollection
TopSpinBruker Biospinprocessing
SparkyGoddardchemical shift assignment
SparkyGoddarddata analysis
SparkyGoddardpeak picking
X-PLOR NIHSchwieters, Kuszewski, Tjandra and Clorestructure solution
TALOSCornilescu, Delaglio and Baxdihedral angle determination
ARIA2.2Rieping W, Habeck M, Bardiaux B, Bernard A, Malliavin TE, Nilges Mstructure solution
ARIA2.2Rieping W, Habeck M, Bardiaux B, Bernard A, Malliavin TE, Nilges Mrefinement
CNS1.2Brunger, Adams, Clore, Gros, Nilges and Readstructure solution
CNS1.2Brunger, Adams, Clore, Gros, Nilges and Readrefinement
SOLARIA1(SOLARIA) Fossi M, Castellani F, Nilges M, Oschkinat H, van Rossum BJstructure solution
RefinementMethod: simulated annealing, molecular dynamics, torsion angle dynamics
Software ordinal: 11
Details: THREE DIMERS CONNECTED BY THEIR C-TERMINAL IXI MOTIF WERE FITTED BACK-TO-BACK IN THE EM DENSITY USING CHIMERA. A HEXAMER WAS BUILT FROM MODEL #7 OF PDB ENTRY 2KLR USING NONCRYSTALLOGRAPHIC ...Details: THREE DIMERS CONNECTED BY THEIR C-TERMINAL IXI MOTIF WERE FITTED BACK-TO-BACK IN THE EM DENSITY USING CHIMERA. A HEXAMER WAS BUILT FROM MODEL #7 OF PDB ENTRY 2KLR USING NONCRYSTALLOGRAPHIC SYMMETRY RESTRAINTS GIVEN IN THE PDB FILE. DIMERS WERE CONNECTED BY THEIR C-TERMINAL DOMAIN CONTAINING THE IXI-MOTIF, AND THE LINKER (UNP RESIDUES 151-155) WAS ENERGY MINIMIZED USING XPLOR-NIH. THE BETA1/BETA2(FREE) STRUCTURAL SEGMENT WAS PLACED INTO THE EM DENSITY TO FULFILL THE CROSSLINKS FOR A57, S59, AND T63, SIMILAR TO PDB ENTRY 1VLQ. ALPHA2 HELICES OF TWO MONOMERS WERE DOCKED, DEFINING RESIDUES L32, L33, L37, AND F38 AS INTERACTING RESIDUES USING HADDOCK. THE ALPHA2 HELICAL COMPLEX WAS PLACED IN WEAK EM DENSITY AT THE THREE-FOLD AXIS. THE FLEXIBLE C- AND N-TERMINAL RESIDUES, INCLUDING PARTS OF HELIX ALPHA1, WERE PLACED INSIDE THE 24MER TO FIT THE RADIUS OF GYRATION, MEASURED BY SMALL-ANGLE X-RAY SCATTERING IN AN ITERATIVE PROCESS. ALL FRAGMENTS WERE CONNECTED USING DISCOVERY STUDIO 1.6 (ACCELRYS) AND THE LINKERS WERE ENERGY MINIMIZED. BACK PROJECTIONS WERE CALCULATED FOR MODELS OF ALPHAB MULTIMERS CONTAINING 24, 26, AND 28 SUBUNITS USING THE PROGRAM SPIDER. THE CALCULATED PROJECTIONS ARE SIMILAR TO EACH OTHER, TO THE CLASS SUM IMAGES FROM COLLECTED EM DATA, AND TO THOSE CALCULATED FROM THE PUBLISHED EM DENSITY (EMD-1776). DETAILS ARE GIVEN IN THE PRIMARY CITATION.
NMR representativeSelection criteria: lowest energy
NMR ensembleConformer selection criteria: structures with the lowest energy
Conformers calculated total number: 200 / Conformers submitted total number: 1
Soln scatter modelMethod: FITTING OF MODELS WITH SAXS DATA;
Conformer selection criteria: BEST FIT WITH NMR, SAXS, AND EM DATA
Details: TO DETERMINE HETEROGENEITY, A PYTHON SCRIPT WAS USED TO MODULATE AND FIT THE THEORETICAL SAXS CURVE OF THE MODEL WITH THE EXPERIMENTAL DATA. THE ALGORITHM THAT WAS APPLIED HAS BEEN PUBLISHED ...Details: TO DETERMINE HETEROGENEITY, A PYTHON SCRIPT WAS USED TO MODULATE AND FIT THE THEORETICAL SAXS CURVE OF THE MODEL WITH THE EXPERIMENTAL DATA. THE ALGORITHM THAT WAS APPLIED HAS BEEN PUBLISHED BY MITTELBACH, R. AND GLATTER, O. (1998) IN J. APPL. CRYSTALLOGR. 31:600-608. FOR DETAILS SEE PRIMARY CITATION.
Num. of conformers calculated: 10 / Num. of conformers submitted: 1 / Representative conformer: 1
Software author list: PETOUKHOV, M.V.; SVERGUN, D.I.; SCHWIETERS, C.D. PETTERSON, E.F.; GODDARD, T.D.; ACCELRYS
Software list: CHIMERA, PRIMUS, GNOM, XPLOR-NIH, CRYSOL, DISCOVERY STUDIO 1.3;

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