4R0O

Crystal structure of PEGylated plastocyanin at 4.2 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.2 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structure of a PEGylated protein reveals a highly porous double-helical assembly.

Cattani, G.Vogeley, L.Crowley, P.B.

(2015) NAT.CHEM. 7: 823-828

  • DOI: 10.1038/nchem.2342

  • PubMed Abstract: 
  • PEGylated proteins are a mainstay of the biopharmaceutical industry. Although the use of poly(ethylene glycol) (PEG) to increase particle size, stability and solubility is well-established, questions remain as to the structure of PEG-protein conjugat ...

    PEGylated proteins are a mainstay of the biopharmaceutical industry. Although the use of poly(ethylene glycol) (PEG) to increase particle size, stability and solubility is well-established, questions remain as to the structure of PEG-protein conjugates. Here we report the structural characterization of a model β-sheet protein (plastocyanin, 11.5 kDa) modified with a single PEG 5,000. An NMR spectroscopy study of the PEGylated conjugate indicated that the protein and PEG behaved as independent domains. A crystal structure revealed an extraordinary double-helical assembly of the conjugate, with the helices arranged orthogonally to yield a highly porous architecture. Electron density was not observed for the PEG chain, which indicates that it was disordered. The volume available per PEG chain in the crystal was within 10% of the calculated random coil volume. Together, these data support a minimal interaction between the protein and the synthetic polymer. Our work provides new possibilities for understanding this important class of protein-polymer hybrids and suggests a novel approach to engineering protein assemblies.


    Organizational Affiliation

    School of Chemistry, National University of Ireland Galway, University Road, Galway, Ireland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Plastocyanin
A, B, C, D
106Phormidium laminosumMutation(s): 0 
Gene Names: petE
Find proteins for Q51883 (Phormidium laminosum)
Go to UniProtKB:  Q51883
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LCY
Query on LCY

Download SDF File 
Download CCD File 
A, B, C, D
1-methylpyrrolidine-2,5-dione
C5 H7 N O2
KYEACNNYFNZCST-UHFFFAOYSA-N
 Ligand Interaction
CU
Query on CU

Download SDF File 
Download CCD File 
A, B, C, D
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.2 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.229 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 116.140α = 90.00
b = 116.140β = 90.00
c = 172.140γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
PHENIXrefinement
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-10-07
    Type: Initial release