9riw

Population A fibril generated from the Heterotypic interaction of Abeta40 and Medin.

Method: ELECTRON MICROSCOPY Dmax: 79.8 Å Quality: REASONABLE

1. Protein Identity and Related Structures Protein Identity & Related Structures

Amyloid-beta protein 40

Homo sapiens

UniProt P05067

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein homooligomer Homooligomer Protein × 8 PDB declaration: octameric(8) Consistent with protein copy count Chain A; UniProt 672–711 Chain B; UniProt 672–711 Chain C; UniProt 672–711 Chain D; UniProt 672–711 Chain E; UniProt 672–711 Chain F; UniProt 672–711 Chain G; UniProt 672–711 Chain H; UniProt 672–711 Not recorded No other associated polymer ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 3.10 Å

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

211 other PDB entries and 282 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name A4_HUMAN
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 1–40; UniProt 672–711 Author chain B; PDBConstruct 1–40; UniProt 672–711 Author chain C; PDBConstruct 1–40; UniProt 672–711 Author chain D; PDBConstruct 1–40; UniProt 672–711 Author chain E; PDBConstruct 1–40; UniProt 672–711 Author chain F; PDBConstruct 1–40; UniProt 672–711 Author chain G; PDBConstruct 1–40; UniProt 672–711 Author chain H; PDBConstruct 1–40; UniProt 672–711

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

SAXS scattering curve SAXS Profile

SAXS profile for 9riw

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 9riw
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2. Structure Basics 2. Structure Basics

Entry ID entry_id9riw
Deposition date deposition_date2025-06-11
Structure title titlePopulation A fibril generated from the Heterotypic interaction of Abeta40 and Medin.
Keywords keywordsAmyloid Beta 40, Aggregation, Neurodegeneration, Medin, PROTEIN FIBRIL; PROTEIN FIBRIL
Experimental Method methodELECTRON MICROSCOPY

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier20.97
Radius of gyration Rg (electron density) rg_electron21.87
Forward intensity I(0) i06835270.00
Molecular weight molecular_weight21057.0 kDa
Excluded volume excluded_volume27232 ų
Envelope volume envelope_volume32217 ų
Hydration-shell volume shell_volume14188 ų
Envelope diameter envelope_diameter77.4
Shell Rg shell_rg26.63
Envelope Rg envelope_rg22.79
Shape Rg shape_rg21.81
Total Rg total_rg22.85
Total atoms total_atoms3048
Residues n_residues208
Spherical-harmonic order n_harmonics20
q range q_range— – 0.5000 −1
Data points n_points101
Shell type shell_typedirectional
Solvent electron density solvent_density0.3340 e/ų
Shell contrast contrast_shell0.0300 e/ų
CRYSOL version crysol_version4.1.3

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax79.8
Rg (real space) rg_real21.44
Rg uncertainty (real space) rg_real_error0.77
I(0) (real space) i0_real6.8350e+06
I(0) uncertainty (real space) i0_real_error1.0010e+05
Rg (reciprocal space) rg_reciprocal21.35
I(0) (reciprocal space) i0_reciprocal6835000.0000
Solution quality estimate total_estimate0.5389
Solution quality rating solution_quality REASONABLE a REASONABLE solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary18.5
Skewness Skewness skewness0.841
Kurtosis Kurtosis kurtosis0.373
Angular range angular_range— – 0.3800 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha2910000.0000
Real-space data points n_real_points70
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.324; Stabil: 1.000; Sysdev: 0.301; Positv: 1.000; Valcen: 0.230; Smooth: 0.896

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (1)

8. Citations (1)

9. Files and Curves (10)