9ni3

Cryo-EM structure of the PI3K alpha/KRas complex on POPC/POPS/PIP2 nanodiscs

Method: ELECTRON MICROSCOPY Dmax: 122.5 Å Quality: GOOD

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

Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform

Homo sapiens

UniProt P42336

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 1–1068 Not recorded Isoform 2B of GTPase KRas × 1 (P01116) PBU (2R)-3-{[(R)-HYDROXY{[(1R,2R,3S,4R,5R,6S)-2,3,6-TRIHYDROXY-4,5-BIS(PHOSPHONOOXY)CYCLOHEXYL]OXY}PHOSPHORYL]OXY}PROPANE-1 ,2-DIYL DIBUTANOATE × 1 A1AZD tert-butyl [2-(2-{[(2P)-2-{4-[4-(2-amino-2-oxoethyl)-2-fluoroanilino]thieno[2,3-d]pyridazin-7-yl}phenyl]oxy}ethoxy)ethyl]carbamate × 1 MG MAGNESIUM ION × 1 GNP PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER × 1 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5;50 mM Tris-HCL, 150 mM NaCl, 1mM TCEP cryo-EM vitrification conditions:Cryogen ETHANE Resolution 2.82 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.

134 other PDB entries and 145 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name PK3CA_HUMAN
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; PDBConstruct 29–1096; UniProt 1–1068

Isoform 2B of 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 heterocomplex Heteromer Protein × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain C; UniProt 1–188 Not recorded Phosphatidylinositol 4,5-bisphosphate 3-kinase catalytic subunit alpha isoform × 1 (P42336) PBU (2R)-3-{[(R)-HYDROXY{[(1R,2R,3S,4R,5R,6S)-2,3,6-TRIHYDROXY-4,5-BIS(PHOSPHONOOXY)CYCLOHEXYL]OXY}PHOSPHORYL]OXY}PROPANE-1 ,2-DIYL DIBUTANOATE × 1 A1AZD tert-butyl [2-(2-{[(2P)-2-{4-[4-(2-amino-2-oxoethyl)-2-fluoroanilino]thieno[2,3-d]pyridazin-7-yl}phenyl]oxy}ethoxy)ethyl]carbamate × 1 MG MAGNESIUM ION × 1 GNP PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER × 1 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5;50 mM Tris-HCL, 150 mM NaCl, 1mM TCEP cryo-EM vitrification conditions:Cryogen ETHANE Resolution 2.82 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.

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 P01116-2
PDB entities 2
Chains and sequence ranges Author chain C; PDBConstruct 2–189; UniProt 1–188

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 9ni3

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 9ni3
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2. Structure Basics 2. Structure Basics

Entry ID entry_id9ni3
Deposition date deposition_date2025-02-25
Structure title titleCryo-EM structure of the PI3K alpha/KRas complex on POPC/POPS/PIP2 nanodiscs
Keywords keywordslipid kinase, GTPase, ONCOPROTEIN, ONCOPROTEIN-Hydrolase complex; ONCOPROTEIN/Hydrolase
Experimental Method methodELECTRON MICROSCOPY

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

Radius of gyration Rg (Guinier) rg_guinier35.60
Radius of gyration Rg (electron density) rg_electron35.20
Forward intensity I(0) i0488871000.00
Molecular weight molecular_weight118790.0 kDa
Excluded volume excluded_volume114550 ų
Envelope volume envelope_volume207000 ų
Hydration-shell volume shell_volume49886 ų
Envelope diameter envelope_diameter130.1
Shell Rg shell_rg40.79
Envelope Rg envelope_rg35.15
Shape Rg shape_rg35.19
Total Rg total_rg35.49
Total atoms total_atoms8957
Residues n_residues1089
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 dmax122.5
Rg (real space) rg_real35.70
Rg uncertainty (real space) rg_real_error1.22
I(0) (real space) i0_real4.8890e+08
I(0) uncertainty (real space) i0_real_error9.2390e+06
Rg (reciprocal space) rg_reciprocal35.64
I(0) (reciprocal space) i0_reciprocal488800000.0000
Solution quality estimate total_estimate0.8555
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary41.8
Skewness Skewness skewness0.486
Kurtosis Kurtosis kurtosis-0.007
Angular range angular_range— – 0.2200 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha49570000.0000
Real-space data points n_real_points45
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.780; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.975; Smooth: 0.802

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (6)

8. Citations (1)

9. Files and Curves (10)