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- PDB-6gk3: Two protofilament beta-2-microglobulin amyloid fibril -

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Basic information

Entry
Database: PDB / ID: 6gk3
TitleTwo protofilament beta-2-microglobulin amyloid fibril
ComponentsBeta-2-microglobulin
KeywordsPROTEIN FIBRIL / amyloid / b2m
Function / homology
Function and homology information


negative regulation of receptor binding / early endosome lumen / Nef mediated downregulation of MHC class I complex cell surface expression / DAP12 interactions / transferrin transport / cellular response to iron ion / Endosomal/Vacuolar pathway / Antigen Presentation: Folding, assembly and peptide loading of class I MHC / peptide antigen assembly with MHC class II protein complex / cellular response to iron(III) ion ...negative regulation of receptor binding / early endosome lumen / Nef mediated downregulation of MHC class I complex cell surface expression / DAP12 interactions / transferrin transport / cellular response to iron ion / Endosomal/Vacuolar pathway / Antigen Presentation: Folding, assembly and peptide loading of class I MHC / peptide antigen assembly with MHC class II protein complex / cellular response to iron(III) ion / MHC class II protein complex / negative regulation of forebrain neuron differentiation / antigen processing and presentation of exogenous protein antigen via MHC class Ib, TAP-dependent / ER to Golgi transport vesicle membrane / peptide antigen assembly with MHC class I protein complex / regulation of iron ion transport / regulation of erythrocyte differentiation / HFE-transferrin receptor complex / response to molecule of bacterial origin / MHC class I peptide loading complex / T cell mediated cytotoxicity / positive regulation of T cell cytokine production / antigen processing and presentation of endogenous peptide antigen via MHC class I / antigen processing and presentation of exogenous peptide antigen via MHC class II / positive regulation of immune response / MHC class I protein complex / positive regulation of T cell activation / peptide antigen binding / positive regulation of receptor-mediated endocytosis / negative regulation of neurogenesis / cellular response to nicotine / positive regulation of T cell mediated cytotoxicity / multicellular organismal-level iron ion homeostasis / specific granule lumen / phagocytic vesicle membrane / recycling endosome membrane / Interferon gamma signaling / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / negative regulation of epithelial cell proliferation / MHC class II protein complex binding / Modulation by Mtb of host immune system / late endosome membrane / sensory perception of smell / positive regulation of cellular senescence / tertiary granule lumen / DAP12 signaling / T cell differentiation in thymus / negative regulation of neuron projection development / ER-Phagosome pathway / protein refolding / early endosome membrane / protein homotetramerization / amyloid fibril formation / intracellular iron ion homeostasis / learning or memory / endoplasmic reticulum lumen / Amyloid fiber formation / Golgi membrane / lysosomal membrane / external side of plasma membrane / focal adhesion / Neutrophil degranulation / SARS-CoV-2 activates/modulates innate and adaptive immune responses / structural molecule activity / endoplasmic reticulum / Golgi apparatus / protein homodimerization activity / extracellular space / extracellular exosome / extracellular region / identical protein binding / membrane / plasma membrane / cytosol
Similarity search - Function
Beta-2-Microglobulin / : / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin C-Type / Immunoglobulin C1-set / Immunoglobulin C1-set domain / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Immunoglobulin-like fold
Similarity search - Domain/homology
Beta-2-microglobulin
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.975 Å
AuthorsIadanza, M.G. / Ranson, N.A.
Funding support United Kingdom, United States, 5items
OrganizationGrant numberCountry
European Research Council322408 United Kingdom
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)EB-002026 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)AG-058504 United States
Wellcome Trust092896MA United Kingdom
Wellcome Trust204963 United Kingdom
CitationJournal: Nat Commun / Year: 2018
Title: The structure of a β-microglobulin fibril suggests a molecular basis for its amyloid polymorphism.
Authors: Matthew G Iadanza / Robert Silvers / Joshua Boardman / Hugh I Smith / Theodoros K Karamanos / Galia T Debelouchina / Yongchao Su / Robert G Griffin / Neil A Ranson / Sheena E Radford /
Abstract: All amyloid fibrils contain a cross-β fold. How this structure differs in fibrils formed from proteins associated with different diseases remains unclear. Here, we combine cryo-EM and MAS-NMR to ...All amyloid fibrils contain a cross-β fold. How this structure differs in fibrils formed from proteins associated with different diseases remains unclear. Here, we combine cryo-EM and MAS-NMR to determine the structure of an amyloid fibril formed in vitro from β-microglobulin (βm), the culprit protein of dialysis-related amyloidosis. The fibril is composed of two identical protofilaments assembled from subunits that do not share βm's native tertiary fold, but are formed from similar β-strands. The fibrils share motifs with other amyloid fibrils, but also contain unique features including π-stacking interactions perpendicular to the fibril axis and an intramolecular disulfide that stabilises the subunit fold. We also describe a structural model for a second fibril morphology and show that it is built from the same subunit fold. The results provide insights into the mechanisms of fibril formation and the commonalities and differences within the amyloid fold in different protein sequences.
History
DepositionMay 18, 2018Deposition site: PDBE / Processing site: PDBE
Revision 1.0Nov 14, 2018Provider: repository / Type: Initial release
Revision 1.1Mar 30, 2022Group: Author supporting evidence / Database references / Category: database_2 / pdbx_audit_support
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_audit_support.funding_organization
Revision 1.2Oct 23, 2024Group: Data collection / Refinement description / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature / refine
Item: _em_admin.last_update / _refine.ls_d_res_high

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Structure visualization

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Assembly

Deposited unit
A: Beta-2-microglobulin
B: Beta-2-microglobulin
C: Beta-2-microglobulin
D: Beta-2-microglobulin
E: Beta-2-microglobulin
F: Beta-2-microglobulin
G: Beta-2-microglobulin
H: Beta-2-microglobulin


Theoretical massNumber of molelcules
Total (without water)61,0848
Polymers61,0848
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: microscopy, Negative stain EM SEM
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area35320 Å2
ΔGint-152 kcal/mol
Surface area25000 Å2
MethodPISA

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Components

#1: Protein
Beta-2-microglobulin


Mass: 7635.446 Da / Num. of mol.: 8
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: B2M, CDABP0092, HDCMA22P / Production host: Escherichia coli (E. coli) / References: UniProt: P61769
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: FILAMENT / 3D reconstruction method: helical reconstruction

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Sample preparation

ComponentName: two protofilament beta-2-microglobulin amyloid fibril / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 53.3 kDa/nm / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 2.5
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMSodium AcetateCH3COONa1
220 mMSodium phosphateNa3PO41
30.01 %Sodium AzideNaN31
SpecimenConc.: 0.025 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Quiescent growth at 0.25 mg/ml for 5 weeks, diluted 10x with buffer
Specimen supportGrid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R3.5/1
VitrificationInstrument: FEI VITROBOT MARK II / Cryogen name: ETHANE / Humidity: 80 % / Chamber temperature: 281.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 130000 X / Nominal defocus max: 3.25 nm / Nominal defocus min: 1.75 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: 10 sec. / Electron dose: 38.5 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 5549
Image scansMovie frames/image: 40 / Used frames/image: 3-40

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Processing

EM software
IDNameVersionCategory
1RELION2.1particle selection
2EPUimage acquisition
4RELION2.1CTF correction
5GctfCTF correction
8UCSF Chimeramodel fitting
10PHENIX1.11.1model refinement
11RELION2.1initial Euler assignment
12RELION2.1final Euler assignment
13RELIONclassification
14RELION3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: -0.608 ° / Axial rise/subunit: 4.83 Å / Axial symmetry: C2
Particle selectionNum. of particles selected: 99000 / Details: 300 x 300 pixel Overlapping segments 90% overlap
3D reconstructionResolution: 3.975 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 11035 / Algorithm: FOURIER SPACE / Num. of class averages: 1 / Symmetry type: HELICAL
Atomic model buildingProtocol: OTHER / Space: REAL
RefinementHighest resolution: 3.975 Å

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