6JC5

Crystal structure of the blue fluorescent protein with a Leu-Leu-Gly tri-peptide chromophore derived from the purple chromoprotein of Stichodactyla haddoni


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 

wwPDB Validation 3D Report Full Report



Literature

Crystal structure of the blue fluorescent protein with a Leu-Leu-Gly tri-peptide chromophore derived from the purple chromoprotein of Stichodactyla haddoni.

Chang, H.Y.Ko, T.P.Chang, Y.C.Huang, K.F.Lin, C.Y.Chou, H.Y.Chiang, C.Y.Tsai, H.J.

(2019) Int J Biol Macromol 130: 675-684

  • DOI: 10.1016/j.ijbiomac.2019.02.138
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Chromoproteins are a good source of engineered biological tools. We previously reported the development of a blue fluorescent protein, termed shBFP, which was derived from a purple chromoprotein shCP found in the sea anemone Stichodacyla haddoni. shB ...

    Chromoproteins are a good source of engineered biological tools. We previously reported the development of a blue fluorescent protein, termed shBFP, which was derived from a purple chromoprotein shCP found in the sea anemone Stichodacyla haddoni. shBFP contains a Leu 63 -Leu 64 -Gly 65 tri-peptide chromophore, and shows maximum excitation and emission wavelengths at 401 nm and 458 nm, along with a high quantum yield. How this chromophore endows shBFP with the unique fluorescence property in the absence of a hydroxyphenyl ring remained unclear. Here, we present the crystal structures of shCP and shBFP at 1.9- and 2.05-Å resolution, respectively. Both proteins crystallized as similar tetramers, but they are more likely to function as dimers in solution. The chromophore in shCP shows a trans-conformation and its non-planarity is similar to most other homologues. The shBFP chromophore also contains an imidazolidone moiety in its structure, but there are a smaller number of conjugated double bonds compared to shCP. Consequently, the chromophore may prefer absorbing shorter wavelength lights in the UV region, followed by the emission of blue fluorescence. These observations provide new insights into the molecular basis that correlates chromophore conformation with light absorption and fluorescence emission for the development of improved biomarkers.


    Organizational Affiliation

    Institute of Biomedical Sciences, MacKay Medical College, New Taipei City, Taiwan. Electronic address: hjtsai@ntu.edu.tw.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
shBFP
A, B, C, D, E, F, G, H
228Stichodactyla haddoniMutation(s): 0 
Find proteins for A0A4V8H022 (Stichodactyla haddoni)
Go to UniProtKB:  A0A4V8H022
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.567α = 90
b = 98.708β = 100.09
c = 197.493γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
Cootmodel building

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Academia Sinica (Taiwan)Taiwan104-2311-B-110-002-MY2
Academia Sinica (Taiwan)TaiwanAS-KPQ-105-TPP
Academia Sinica (Taiwan)Taiwan107-0210-01-19-04

Revision History 

  • Version 1.0: 2019-03-20
    Type: Initial release