+Open data
-Basic information
Entry | Database: PDB / ID: 6gk3 | ||||||||||||||||||
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Title | Two protofilament beta-2-microglobulin amyloid fibril | ||||||||||||||||||
Components | Beta-2-microglobulin | ||||||||||||||||||
Keywords | PROTEIN FIBRIL / amyloid / b2m | ||||||||||||||||||
Function / homology | Function and homology information positive regulation of ferrous iron binding / positive regulation of transferrin receptor binding / negative regulation of receptor binding / DAP12 interactions / positive regulation of receptor binding / early endosome lumen / Nef mediated downregulation of MHC class I complex cell surface expression / cellular response to iron ion / Endosomal/Vacuolar pathway / Antigen Presentation: Folding, assembly and peptide loading of class I MHC ...positive regulation of ferrous iron binding / positive regulation of transferrin receptor binding / negative regulation of receptor binding / DAP12 interactions / positive regulation of receptor binding / early endosome lumen / Nef mediated downregulation of MHC class I complex cell surface expression / cellular response to iron ion / Endosomal/Vacuolar pathway / Antigen Presentation: Folding, assembly and peptide loading of class I MHC / cellular response to iron(III) ion / antigen processing and presentation of exogenous protein antigen via MHC class Ib, TAP-dependent / negative regulation of forebrain neuron differentiation / regulation of erythrocyte differentiation / peptide antigen assembly with MHC class I protein complex / ER to Golgi transport vesicle membrane / regulation of iron ion transport / response to molecule of bacterial origin / MHC class I peptide loading complex / HFE-transferrin receptor complex / T cell mediated cytotoxicity / positive regulation of T cell cytokine production / antigen processing and presentation of endogenous peptide antigen via MHC class I / sensory perception of smell / MHC class I protein complex / negative regulation of neurogenesis / positive regulation of receptor-mediated endocytosis / peptide antigen assembly with MHC class II protein complex / multicellular organismal-level iron ion homeostasis / MHC class II protein complex / cellular response to nicotine / specific granule lumen / positive regulation of T cell mediated cytotoxicity / positive regulation of cellular senescence / recycling endosome membrane / phagocytic vesicle membrane / peptide antigen binding / antigen processing and presentation of exogenous peptide antigen via MHC class II / negative regulation of epithelial cell proliferation / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / positive regulation of immune response / Interferon gamma signaling / positive regulation of T cell activation / Modulation by Mtb of host immune system / negative regulation of neuron projection development / positive regulation of protein binding / tertiary granule lumen / DAP12 signaling / MHC class II protein complex binding / late endosome membrane / iron ion transport / ER-Phagosome pathway / T cell differentiation in thymus / early endosome membrane / protein refolding / protein homotetramerization / intracellular iron ion homeostasis / amyloid fibril formation / learning or memory / Amyloid fiber formation / endoplasmic reticulum lumen / lysosomal membrane / Golgi membrane / external side of plasma membrane / focal adhesion / Neutrophil degranulation / SARS-CoV-2 activates/modulates innate and adaptive immune responses / structural molecule activity / Golgi apparatus / endoplasmic reticulum / protein homodimerization activity / extracellular space / extracellular exosome / extracellular region / identical protein binding / membrane / plasma membrane / cytosol Similarity search - Function | ||||||||||||||||||
Biological species | Homo sapiens (human) | ||||||||||||||||||
Method | ELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.975 Å | ||||||||||||||||||
Authors | Iadanza, M.G. / Ranson, N.A. | ||||||||||||||||||
Funding support | United Kingdom, United States, 5items
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Citation | Journal: 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 |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | Molecule: MolmilJmol/JSmol |
-Downloads & links
-Download
PDBx/mmCIF format | 6gk3.cif.gz | 98.1 KB | Display | PDBx/mmCIF format |
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PDB format | pdb6gk3.ent.gz | 80.4 KB | Display | PDB format |
PDBx/mmJSON format | 6gk3.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 6gk3_validation.pdf.gz | 664.9 KB | Display | wwPDB validaton report |
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Full document | 6gk3_full_validation.pdf.gz | 683 KB | Display | |
Data in XML | 6gk3_validation.xml.gz | 26.9 KB | Display | |
Data in CIF | 6gk3_validation.cif.gz | 38.9 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/gk/6gk3 ftp://data.pdbj.org/pub/pdb/validation_reports/gk/6gk3 | HTTPS FTP |
-Related structure data
Related structure data | 0014MC 0021C M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | |
EM raw data | EMPIAR-10207 (Title: Beta-2-microglobulin fibrils with multiple polymorphs formed at pH 2 Data size: 294.3 Data #1: Aligned, dose-weighted micrographs [micrographs - single frame]) |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
#1: Protein | 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 |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: FILAMENT / 3D reconstruction method: helical reconstruction |
-Sample preparation
Component | Name: two protofilament beta-2-microglobulin amyloid fibril / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT | ||||||||||||||||||||
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Molecular weight | Value: 53.3 kDa/nm / Experimental value: NO | ||||||||||||||||||||
Source (natural) | Organism: Homo sapiens (human) | ||||||||||||||||||||
Source (recombinant) | Organism: Escherichia coli (E. coli) | ||||||||||||||||||||
Buffer solution | pH: 2.5 | ||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 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 support | Grid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R3.5/1 | ||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK II / Cryogen name: ETHANE / Humidity: 80 % / Chamber temperature: 281.15 K |
-Electron microscopy imaging
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: 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 holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average 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 scans | Movie frames/image: 40 / Used frames/image: 3-40 |
-Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||
Helical symmerty | Angular rotation/subunit: -0.608 ° / Axial rise/subunit: 4.83 Å / Axial symmetry: C2 | ||||||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 99000 / Details: 300 x 300 pixel Overlapping segments 90% overlap | ||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 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 building | Protocol: OTHER / Space: REAL | ||||||||||||||||||||||||||||||||||||||||||||
Refinement | Highest resolution: 3.9 Å |