1AQ1 | pdb_00001aq1

HUMAN CYCLIN DEPENDENT KINASE 2 COMPLEXED WITH THE INHIBITOR STAUROSPORINE

• PDB DOI: https://doi.org/10.2210/pdb1AQ1/pdb

• Classification: PROTEIN KINASE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 1997-08-05 Released: 1997-11-12 
• Deposition Author(s): Endicott, J.A., Noble, M.E.M., Johnson, L.N., Lawrie, A., Tunnah, P., Brown, N.R.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 
  0.260 (Depositor), 0.249 (DCC) 
• R-Value Work: 
  0.220 (Depositor) 

Starting Model: experimental

Literature

Protein kinase inhibition by staurosporine revealed in details of the molecular interaction with CDK2.

Lawrie, A.M., Noble, M.E., Tunnah, P., Brown, N.R., Johnson, L.N., Endicott, J.A.

(1997) Nat Struct Biol 4: 796-801

• PubMed: 9334743 
• DOI: https://doi.org/10.1038/nsb1097-796
• Primary Citation Related Structures: 
  1AQ1


• PubMed Abstract: 
  

  Staurosporine exhibits nanomolar IC50 values against a wide range of protein kinases. The structure of a CDK2 staurosporine complex explains the tight binding of this inhibitor, and suggests features to be exploited in the design of specific inhibitors of CDKs.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 34.44 kDa 
• Atom Count: 2,390 
• Modeled Residue Count: 277 
• Deposited Residue Count: 298 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CYCLIN-DEPENDENT PROTEIN KINASE 2	A	298	Homo sapiens	Mutation(s): 0  EC: 2.7.1.37 (PDB Primary Data), 2.7.11.22 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P24941 (Homo sapiens) Explore P24941  Go to UniProtKB:  P24941
PHAROS:  P24941 GTEx:  ENSG00000123374

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
STU	B [auth A]	STAUROSPORINE C28 H26 N4 O3 HKSZLNNOFSGOKW-FYTWVXJKSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
STU	BindingDB:  1AQ1	IC50: 3.93 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free:  0.260 (Depositor), 0.249 (DCC) 
• R-Value Work:  0.220 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 53.5	α = 90
b = 70.5	β = 90
c = 73.6	γ = 90

Software Package:

Software Name	Purpose
CCP4	model building
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling
CCP4	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-11-12 
Deposition Author(s): Endicott, J.A., Noble, M.E.M., Johnson, L.N., Lawrie, A., Tunnah, P., Brown, N.R.

Revision History  

• Version 1.0: 1997-11-12
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-08-02
  Changes: Database references, Derived calculations, Other, Refinement description
• Version 1.4: 2024-05-22
  Changes: Data collection