Biological Assembly 1  

 3D View: Structure

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Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 31128.78 
• Atom Count: 1988 
• Residue Count: 280 
• Unique protein chains: 1

1RHP

CRYSTAL STRUCTURE OF RECOMBINANT HUMAN PLATELET FACTOR 4

• DOI: 10.2210/pdb1RHP/pdb

• Classification: PLATELET FACTOR
• Organism(s): Homo sapiens


• Deposited: 1994-09-16 Released: 1994-11-30 
• Deposition Author(s): Chen, L., Zhang, X.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Work: 0.241 

Literature

Crystal structure of recombinant human platelet factor 4.

Zhang, X., Chen, L., Bancroft, D.P., Lai, C.K., Maione, T.E.

(1994) Biochemistry 33: 8361-8366

• PubMed: 8031770 


• PubMed Abstract: 
  

The crystal structure of human platelet factor 4 (PF4) has been solved to a resolution of 2.4 A by molecular replacement and refined to an R-factor of 24.1%. The structure consists of four polypeptide chains which form a tetrameric unit. N-terminal residues, previously defined as a random coil or extended loop region, form antiparallel beta-sheet-like structures that form noncovalent associations between dimers. These antiparallel beta-sheet-like structures are positioned lateral to the beta-bilayer motif and stabilize the tetrameric unit. A positively charged ring of lysine and arginine side chains encircles the PF4 tetramer sphere, presenting multiple potential sites and orientations for heparin binding. The electrostatic interactions of multiply charged amino acid side chains and hydrogen bonding interactions at the AB/CD dimer interface serve to stabilize the tetrameric structure further.

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Organizational Affiliation: 

Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PLATELET FACTOR 4	A, B, C, D	70	Homo sapiens	Mutation(s): 0  Gene Names: PF4 (CXCL4, SCYB4)
Find proteins for P02776 (Homo sapiens) Go to Gene View: PF4 Go to UniProtKB:  P02776

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Work: 0.241 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 78.200	α = 90.00
b = 86.200	β = 90.00
c = 43.400	γ = 90.00

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1994-09-16 
• Released Date: 1994-11-30 
• Deposition Author(s): Chen, L., Zhang, X.

Revision History 

• Version 1.0: 1994-11-30
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance