1JSU | pdb_00001jsu

P27(KIP1)/CYCLIN A/CDK2 COMPLEX

• PDB DOI: https://doi.org/10.2210/pdb1JSU/pdb

• Classification: COMPLEX (TRANSFERASE/CYCLIN/INHIBITOR)
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda, Escherichia coli
• Mutation(s): Yes 


• Deposited: 1996-07-03 Released: 1997-07-29 
• Deposition Author(s): Russo, A.A., Jeffrey, P.D., Pavletich, N.P.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 
  0.260 (Depositor) 
• R-Value Work: 
  0.192 (Depositor) 

Literature

Crystal structure of the p27Kip1 cyclin-dependent-kinase inhibitor bound to the cyclin A-Cdk2 complex.

Russo, A.A., Jeffrey, P.D., Patten, A.K., Massague, J., Pavletich, N.P.

(1996) Nature 382: 325-331

• PubMed: 8684460 
• DOI: https://doi.org/10.1038/382325a0
• Primary Citation Related Structures: 
  1JSU


• PubMed Abstract: 
  

  The crystal structure of the human p27Kip1 kinase inhibitory domain bound to the phosphorylated cyclin A-cyclin-dependent kinase 2 (Cdk2) complex has been determined at 2.3 angstrom. p27Kip1 binds the complex as an extended structure interacting with both cyclin A and Cdk2. On cyclin A, it binds in a groove formed by conserved cyclin box residues. On Cdk2, it binds and rearranges the amino-terminal lobe and also inserts into the catalytic cleft, mimicking ATP.

---

Organizational Affiliation: 
• Cellular Biochemistry and Biophysics Program, Howard Hughes Medical Institute, Memorial Sloan-Kettering Cancer Center, New York 10021, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 73.99 kDa 
• Atom Count: 5,182 
• Modeled Residue Count: 613 
• Deposited Residue Count: 642 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CYCLIN-DEPENDENT KINASE-2	A	298	Homo sapiens	Mutation(s): 1  EC: 2.7.1 (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

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
CYCLIN A	B	260	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P20248 (Homo sapiens) Explore P20248  Go to UniProtKB:  P20248
PHAROS:  P20248 GTEx:  ENSG00000145386

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
P27	C	84	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P46527 (Homo sapiens) Explore P46527  Go to UniProtKB:  P46527
PHAROS:  P46527 GTEx:  ENSG00000111276

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	D [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
TPO	A	L-PEPTIDE LINKING	C4 H10 N O6 P		THR

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free:  0.260 (Depositor) 
• R-Value Work:  0.192 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 73.8	α = 90
b = 78.3	β = 90
c = 137.2	γ = 90

Software Package:

Software Name	Purpose
TNT	refinement
HKL	data reduction

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-07-29 
Deposition Author(s): Russo, A.A., Jeffrey, P.D., Pavletich, N.P.

Revision History  

• Version 1.0: 1997-07-29
  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: 2024-06-05
  Changes: Data collection, Database references, Derived calculations, Other
• Version 1.4: 2024-10-16
  Changes: Structure summary