Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

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

Macromolecule Content

• Total Structure Weight: 94.72 kDa 
• Atom Count: 6448 
• Residue Count: 804 
• Unique protein chains: 2

1AXC

HUMAN PCNA

• DOI: 10.2210/pdb1AXC/pdb

• Classification: COMPLEX (DNA-BINDING PROTEIN/DNA)
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 1997-10-14 Released: 1998-01-28 
• Deposition Author(s): Gulbis, J.M., Kuriyan, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.289 
• R-Value Work: 0.192 
• R-Value Observed: 0.192 

Literature

Structure of the C-terminal region of p21(WAF1/CIP1) complexed with human PCNA.

Gulbis, J.M., Kelman, Z., Hurwitz, J., O'Donnell, M., Kuriyan, J.

(1996) Cell 87: 297-306

• PubMed: 8861913 
• DOI: 10.1016/s0092-8674(00)81347-1
• Primary Citation of Related Structures:  
  1AXC


• PubMed Abstract: 
  

The crystal structure of the human DNA polymerase delta processivity factor PCNA (proliferating cell nuclear antigen) complexed with a 22 residue peptide derived from the C-terminus of the cell-cycle checkpoint protein p21(WAF1/CIP1) has been determined at 2.6 angstrom resolution. p21 binds to PCNA in a 1:1 stoichiometry with an extensive array of interactions that include the formation of a beta sheet with the interdomain connector loop of PCNA. An intact trimeric ring is maintained in the structure of the p21-PCNA complex, with a central hole available for DNA interaction. The ability of p21 to inhibit the action of PCNA is therefore likely to be due to its masking of elements on PCNA that are required for the binding of other components of the polymerase assembly.

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Organizational Affiliation: 

Laboratory of Molecular Biophysics, The Rockefeller University, New York, New York 10021, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PCNA	A, C, E	261	Homo sapiens	Mutation(s): 0  Gene Names: PCNA
Find proteins for P12004 (Homo sapiens) Explore P12004  Go to UniProtKB:  P12004
NIH Common Fund Data Resources
PHAROS  P12004 GTEx  ENSG00000132646

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
P21/WAF1	B, D, F	22	Homo sapiens	Mutation(s): 0  Gene Names: CDKN1A, CAP20, CDKN1, CIP1, MDA6, PIC1, SDI1, WAF1
Find proteins for P38936 (Homo sapiens) Explore P38936  Go to UniProtKB:  P38936
NIH Common Fund Data Resources
PHAROS  P38936 GTEx  ENSG00000124762

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.289 
• R-Value Work: 0.192 
• R-Value Observed: 0.192 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 83.5	α = 90
b = 83.5	β = 90
c = 233.9	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-10-14 
• Released Date: 1998-01-28 
Deposition Author(s): Gulbis, J.M., Kuriyan, J.

Revision History 

• Version 1.0: 1998-01-28
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance