9i9j

Cryo-EM structure of CAK-CDK2 (determined in the presence of ADP-nitrate)

Method: ELECTRON MICROSCOPY Dmax: 93.6 Å Quality: EXCELLENT

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

CDK-activating kinase assembly factor MAT1

Homo sapiens

UniProt P51948

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 × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain H; UniProt 1–309 Not recorded Cyclin-H × 1 (P51946) Cyclin-dependent kinase 7 × 1 (P50613) Cyclin-dependent kinase 2 × 1 (P24941) ADP ADENOSINE-5'-DIPHOSPHATE × 2 MG MAGNESIUM ION × 1 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.

66 other PDB entries and 68 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name MAT1_HUMAN
Isoform P51948-1
PDB entities 1
Chains and sequence ranges Author chain H; PDBConstruct 20–328; UniProt 1–309

Cyclin-H

Homo sapiens

UniProt P51946

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 × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain I; UniProt 1–323 Non-standard monomer:Yes (specific site not provided by mmCIF) CDK-activating kinase assembly factor MAT1 × 1 (P51948) Cyclin-dependent kinase 7 × 1 (P50613) Cyclin-dependent kinase 2 × 1 (P24941) ADP ADENOSINE-5'-DIPHOSPHATE × 2 MG MAGNESIUM ION × 1 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.

46 other PDB entries and 47 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name CCNH_HUMAN
Isoform
PDB entities 2
Chains and sequence ranges Author chain I; PDBConstruct 2–324; UniProt 1–323

Cyclin-dependent kinase 7

Homo sapiens

UniProt P50613

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 × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain J; UniProt 1–346 Not recorded CDK-activating kinase assembly factor MAT1 × 1 (P51948) Cyclin-H × 1 (P51946) Cyclin-dependent kinase 2 × 1 (P24941) ADP ADENOSINE-5'-DIPHOSPHATE × 2 MG MAGNESIUM ION × 1 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.

53 other PDB entries and 64 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name CDK7_HUMAN
Isoform
PDB entities 3
Chains and sequence ranges Author chain J; PDBConstruct 46–391; UniProt 1–346

Cyclin-dependent kinase 2

Homo sapiens

UniProt P24941

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 × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain K; UniProt 1–298 Not recorded CDK-activating kinase assembly factor MAT1 × 1 (P51948) Cyclin-H × 1 (P51946) Cyclin-dependent kinase 7 × 1 (P50613) ADP ADENOSINE-5'-DIPHOSPHATE × 2 MG MAGNESIUM ION × 1 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.

518 other PDB entries and 664 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name CDK2_HUMAN
Isoform
PDB entities 4
Chains and sequence ranges Author chain K; PDBConstruct 4–301; UniProt 1–298

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 9i9j

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 9i9j
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2. Structure Basics 2. Structure Basics

Entry ID entry_id9i9j
Deposition date deposition_date2025-02-06
Structure title titleCryo-EM structure of CAK-CDK2 (determined in the presence of ADP-nitrate)
Keywords keywordsComplex, cell cycle, kinase, TRANSFERASE; TRANSFERASE
Experimental Method methodELECTRON MICROSCOPY

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

Radius of gyration Rg (Guinier) rg_guinier31.20
Radius of gyration Rg (electron density) rg_electron30.28
Forward intensity I(0) i0149276000.00
Molecular weight molecular_weight100130.0 kDa
Excluded volume excluded_volume126770 ų
Envelope volume envelope_volume162150 ų
Hydration-shell volume shell_volume43470 ų
Envelope diameter envelope_diameter95.7
Shell Rg shell_rg38.50
Envelope Rg envelope_rg30.06
Shape Rg shape_rg30.27
Total Rg total_rg31.08
Total atoms total_atoms7051
Residues n_residues870
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 dmax93.6
Rg (real space) rg_real31.03
Rg uncertainty (real space) rg_real_error0.63
I(0) (real space) i0_real1.4930e+08
I(0) uncertainty (real space) i0_real_error2.2790e+06
Rg (reciprocal space) rg_reciprocal31.10
I(0) (reciprocal space) i0_reciprocal149300000.0000
Solution quality estimate total_estimate0.9074
Solution quality rating solution_quality EXCELLENT a EXCELLENT solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary40.4
Skewness Skewness skewness0.131
Kurtosis Kurtosis kurtosis-0.583
Angular range angular_range— – 0.2550 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha62500000.0000
Real-space data points n_real_points52
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.971; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.995; Smooth: 0.885

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (7)

8. Citations (1)

9. Files and Curves (10)