The 2.1A crystal structure of copGFP

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.233 

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The 2.1A crystal structure of copGFP, a representative member of the copepod clade within the green fluorescent protein superfamily

Wilmann, P.G.Battad, J.Petersen, J.Wilce, M.C.J.Dove, S.Devenish, R.J.Prescott, M.Rossjohn, J.

(2006) J Mol Biol 359: 890-900

  • DOI: https://doi.org/10.1016/j.jmb.2006.04.002
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The green fluorescent protein (avGFP), its variants, and the closely related GFP-like proteins are characterized structurally by a cyclic tri-peptide chromophore located centrally within a conserved beta-can fold. Traditionally, these GFP family members have been isolated from the Cnidaria although recently, distantly related GFP-like proteins from the Bilateria, a sister group of the Cnidaria have been described, although no representative structure from this phylum has been reported to date. We have determined to 2.1A resolution the crystal structure of copGFP, a representative GFP-like protein from a copepod, a member of the Bilateria. The structure of copGFP revealed that, despite sharing only 19% sequence identity with GFP, the tri-peptide chromophore (Gly57-Tyr58-Gly59) of copGFP adopted a cis coplanar conformation within the conserved beta-can fold. However, the immediate environment surrounding the chromophore of copGFP was markedly atypical when compared to other members of the GFP-superfamily, with a large network of bulky residues observed to surround the chromophore. Arg87 and Glu222 (GFP numbering 96 and 222), the only two residues conserved between copGFP, GFP and GFP-like proteins are involved in autocatalytic genesis of the chromophore. Accordingly, the copGFP structure provides an alternative platform for the development of a new suite of fluorescent protein tools. Moreover, the structure suggests that the autocatalytic genesis of the chromophore is remarkably tolerant to a high degree of sequence and structural variation within the beta-can fold of the GFP superfamily.

  • Organizational Affiliation

    The Protein Crystallography Unit, School of Biomedical Sciences, Monash University, Clayton Campus, Vic. 3800, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
green fluorescent protein 2
A, B, C, D, E
A, B, C, D, E, F
220Pontellina plumataMutation(s): 1 
Find proteins for Q6WV12 (Pontellina plumata)
Explore Q6WV12 
Go to UniProtKB:  Q6WV12
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6WV12
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on CR2
A, B, C, D, E
A, B, C, D, E, F
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.233 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 145.954α = 90
b = 145.954β = 90
c = 53.767γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-15
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description