1fkn

Structure of Beta-Secretase Complexed with Inhibitor

Method: X-RAY DIFFRACTION Dmax: 111.6 Å Quality: GOOD

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

MEMAPSIN 2

Homo sapiens

UniProt P56817

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 heterocomplex Heteromer Protein × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain A; UniProt 46–436 Fragment:PROTEASE DOMAIN inhibitor × 1 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.4;293 K;22.5% PEG 8000, 0.1M Na-cacodylate, 0.2M ammonium sulfate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 293K Resolution 1.90 Å R-free 0.224
2 Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain B; UniProt 46–436 Fragment:PROTEASE DOMAIN inhibitor × 1 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.4;293 K;22.5% PEG 8000, 0.1M Na-cacodylate, 0.2M ammonium sulfate, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 293K Resolution 1.90 Å R-free 0.224

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.

430 other PDB entries and 735 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name BACE1_HUMAN
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 1–391; UniProt 46–436 Author chain B; PDBConstruct 1–391; UniProt 46–436

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 1fkn

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 1fkn
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2. Structure Basics 2. Structure Basics

Entry ID entry_id1fkn
Deposition date deposition_date2000-08-09
Structure title titleStructure of Beta-Secretase Complexed with Inhibitor
Keywords keywords;Alzheimer's disease, beta-secretase, memapsin 2, BASE, aspartic protease, HYDROLASE-HYDROLASE INHIBITOR COMPLEX ;; HYDROLASE/HYDROLASE INHIBITOR
Experimental Method methodX-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier34.59
Radius of gyration Rg (electron density) rg_electron34.16
Forward intensity I(0) i0118865000.00
Molecular weight molecular_weight88624.0 kDa
Excluded volume excluded_volume111200 ų
Envelope volume envelope_volume138180 ų
Hydration-shell volume shell_volume34469 ų
Envelope diameter envelope_diameter114.5
Shell Rg shell_rg39.94
Envelope Rg envelope_rg33.73
Shape Rg shape_rg34.15
Total Rg total_rg34.61
Total atoms total_atoms6254
Residues n_residues792
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 dmax111.6
Rg (real space) rg_real34.72
Rg uncertainty (real space) rg_real_error0.99
I(0) (real space) i0_real1.1890e+08
I(0) uncertainty (real space) i0_real_error2.1010e+06
Rg (reciprocal space) rg_reciprocal34.65
I(0) (reciprocal space) i0_reciprocal118900000.0000
Solution quality estimate total_estimate0.8575
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary29.1
Skewness Skewness skewness0.317
Kurtosis Kurtosis kurtosis-0.794
Angular range angular_range— – 0.2300 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha43390000.0000
Real-space data points n_real_points47
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.795; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.876; Smooth: 0.881

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (3)

7. Fold Classification (SCOP + CATH) 6 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd1fkna_
Class classb — All beta proteins
Fold Fold foldb.50 — Acid proteases
Superfamily Superfamily superfamilyb.50.1 — Acid proteases
Family Family familyb.50.1.2 — Pepsin-like
Domain ID domain_idd1fknb_
Class classb — All beta proteins
Fold Fold foldb.50 — Acid proteases
Superfamily Superfamily superfamilyb.50.1 — Acid proteases
Family Family familyb.50.1.2 — Pepsin-like

CATH v4.4 (4 domains)

Domain ID domain_id1fknA01
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology70 — Cathepsin D, subunit A; domain 1
Homologous superfamily homologous superfamily10 — Acid Proteases
Domain ID domain_id1fknA02
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology70 — Cathepsin D, subunit A; domain 1
Homologous superfamily homologous superfamily10 — Acid Proteases
Domain ID domain_id1fknB01
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology70 — Cathepsin D, subunit A; domain 1
Homologous superfamily homologous superfamily10 — Acid Proteases
Domain ID domain_id1fknB02
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology70 — Cathepsin D, subunit A; domain 1
Homologous superfamily homologous superfamily10 — Acid Proteases

8. Citations (1)

9. Files and Curves (10)