4epx

Discovery of Small Molecules that Bind to K-Ras and Inhibit Sos-mediated Activation

Method: X-RAY DIFFRACTION Dmax: 51.1 Å Quality: GOOD

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

GTPase KRas

Homo sapiens

UniProt P01116

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 monomer Monomer Protein × 1 PDB declaration: monomeric(1) Consistent with protein copy count Chain A; UniProt 1–169 Mutation:G12V, C118S GDP GUANOSINE-5'-DIPHOSPHATE × 1 MG MAGNESIUM ION × 1 0QR N-(6-aminopyridin-2-yl)-4-fluorobenzenesulfonamide × 1 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, SITTING DROP;pH 4.5;291 K;28% PEG8000, 0.1 M sodium acetate, 5% DMSO, pH 4.5, VAPOR DIFFUSION, SITTING DROP, temperature 291K Resolution 1.76 Å R-free 0.201

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.

445 other PDB entries and 804 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name RASK_HUMAN
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 2–170; UniProt 1–169

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 4epx

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 4epx
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2. Structure Basics 2. Structure Basics

Entry ID entry_id4epx
Deposition date deposition_date2012-04-17
Structure title titleDiscovery of Small Molecules that Bind to K-Ras and Inhibit Sos-mediated Activation
Keywords keywordssmall GTPase, Signaling transduction, Raf, Ral, Sos, PI3K, cytosol, binder, HYDROLASE, Inhibitor of Sos-mediated activation; HYDROLASE
Experimental Method methodX-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier16.35
Radius of gyration Rg (electron density) rg_electron15.27
Forward intensity I(0) i014570800.00
Molecular weight molecular_weight18679.0 kDa
Excluded volume excluded_volume17770 ų
Envelope volume envelope_volume27700 ų
Hydration-shell volume shell_volume15059 ų
Envelope diameter envelope_diameter51.0
Shell Rg shell_rg21.55
Envelope Rg envelope_rg15.62
Shape Rg shape_rg15.23
Total Rg total_rg16.14
Total atoms total_atoms1405
Residues n_residues170
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 dmax51.1
Rg (real space) rg_real16.21
Rg uncertainty (real space) rg_real_error0.21
I(0) (real space) i0_real1.4570e+07
I(0) uncertainty (real space) i0_real_error1.6130e+05
Rg (reciprocal space) rg_reciprocal16.23
I(0) (reciprocal space) i0_reciprocal14570000.0000
Solution quality estimate total_estimate0.8937
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary21.0
Skewness Skewness skewness0.079
Kurtosis Kurtosis kurtosis-0.486
Angular range angular_range— – 0.4850 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha2576000.0000
Real-space data points n_real_points79
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.886; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.983; Smooth: 0.975

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (5)

7. Fold Classification (SCOP + CATH) 3 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd4epxa1
Class classc — Alpha and beta proteins (a/b)
Fold Fold foldc.37 — P-loop containing nucleoside triphosphate hydrolases
Superfamily Superfamily superfamilyc.37.1 — P-loop containing nucleoside triphosphate hydrolases
Family Family familyc.37.1.8 — G proteins
Domain ID domain_idd4epxa2
Class classl — Artifacts
Fold Fold foldl.1 — Tags
Superfamily Superfamily superfamilyl.1.1 — Tags
Family Family familyl.1.1.1 — Tags

CATH v4.4 (1 domains)

Domain ID domain_id4epxA00
Class class3 — Alpha Beta
Architecture architecture40 — 3-Layer(aba) Sandwich
Topology topology50 — Rossmann fold
Homologous superfamily homologous superfamily300 — P-loop containing nucleotide triphosphate hydrolases

8. Citations (1)

9. Files and Curves (10)