Macromolecule Content

• Total Structure Weight: 30512.92 
• Atom Count: 2120 
• Residue Count: 272 
• Unique protein chains: 1

1PFM

PF4-M2 CHIMERIC MUTANT WITH THE FIRST 10 N-TERMINAL RESIDUES OF R-PF4 REPLACED BY THE N-TERMINAL RESIDUES OF THE IL8 SEQUENCE. MODELS 1-15 OF A 27-MODEL SET.

• DOI: 10.2210/pdb1PFM/pdb

• Classification: CYTOKINE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): 2 


• Deposited: 1995-07-18 Released: 1996-01-29 
• Deposition Author(s): Mayo, K.H., Roongta, V., Ilyina, E., Milius, R., Barker, S., Quinlan, C., La Rosa, G., Daly, T.J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 15 

Literature

NMR solution structure of the 32-kDa platelet factor 4 ELR-motif N-terminal chimera: a symmetric tetramer.

Mayo, K.H., Roongta, V., Ilyina, E., Milius, R., Barker, S., Quinlan, C., La Rosa, G., Daly, T.J.

(1995) Biochemistry 34: 11399-11409

• PubMed: 7547867 
• Primary Citation of Related Structures:  
  1PFN


• PubMed Abstract: 
  

Native human platelet factor 4 (PF4) is a homotetrameric protein (70 residues/subunit) known for its anticoagulant heparin binding activity. 2D 15N--1H HSQC NMR experiments of native PF4 in solution show the presence of conformational heterogeneity consistent with the formation of asymmetric homo-tetramers as observed in the X-ray crystal structure of both human and bovine PF4. A chimeric mutant of PF4 (called PF4-M2) which substitutes the first 11 N-terminal residues for the first eight residues from homologous interleukin-8 forms symmetric homo-tetramers with essentially the same heparin binding activity as native PF4. The solution structure of PF4-M2 has been investigated by using two- and three-dimensional 1H- and 15N-NMR spectroscopy and NOE-restrained simulated annealing molecular dynamics. As with other members of the CXC chemokine family whose structures are known, the PF4-M2 subunit monomer consists of a mostly hydrophobic, triple-stranded antiparallel beta-sheet onto which is folded an amphipathic C-terminal helix and a less periodic N-terminal domain. Although N-terminal substitution with the less acidic interleukin-8 sequence most affects the quarternary structure relative to native PF4 at the AC and AD dimer interfaces, AB dimer stability is weakened as reflected in reduced equilibrium association binding constants.

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Related Citations: 

• 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




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Organizational Affiliation: 

Department of Biochemistry, University of Minnesota, Minneapolis 55455, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PF4-M2 CHIMERA	A, B, C, D	68	Homo sapiens	Mutation(s): 2  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: SOLUTION NMR
• Conformers Submitted: 15 
• Olderado: 1PFM Olderado

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-07-18 
• Released Date: 1996-01-29 
• Deposition Author(s): Mayo, K.H., Roongta, V., Ilyina, E., Milius, R., Barker, S., Quinlan, C., La Rosa, G., Daly, T.J.

Revision History 

• Version 1.0: 1996-01-29
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance