1QYF

Crystal structure of matured green fluorescent protein R96A variant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.145 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mechanism and energetics of green fluorescent protein chromophore synthesis revealed by trapped intermediate structures.

Barondeau, D.P.Putnam, C.D.Kassmann, C.J.Tainer, J.A.Getzoff, E.D.

(2003) Proc Natl Acad Sci U S A 100: 12111-12116

  • DOI: 10.1073/pnas.2133463100
  • Primary Citation of Related Structures:  
    1QXT, 1QY3, 1QYO, 1QYQ, 1QYF

  • PubMed Abstract: 
  • Green fluorescent protein has revolutionized cell labeling and molecular tagging, yet the driving force and mechanism for its spontaneous fluorophore synthesis are not established. Here we discover mutations that substantially slow the rate but not t ...

    Green fluorescent protein has revolutionized cell labeling and molecular tagging, yet the driving force and mechanism for its spontaneous fluorophore synthesis are not established. Here we discover mutations that substantially slow the rate but not the yield of this posttranslational modification, determine structures of the trapped precyclization intermediate and oxidized postcyclization states, and identify unanticipated features critical to chromophore maturation. The protein architecture contains a dramatic approximately 80 degrees bend in the central helix, which focuses distortions at G67 to promote ring formation from amino acids S65, Y66, and G67. Significantly, these distortions eliminate potential helical hydrogen bonds that would otherwise have to be broken at an energetic cost during peptide cyclization and force the G67 nitrogen and S65 carbonyl oxygen atoms within van der Waals contact in preparation for covalent bond formation. Further, we determine that under aerobic, but not anaerobic, conditions the Gly-Gly-Gly chromophore sequence cyclizes and incorporates an oxygen atom. These results lead directly to a conjugation-trapping mechanism, in which a thermodynamically unfavorable cyclization reaction is coupled to an electronic conjugation trapping step, to drive chromophore maturation. Moreover, we propose primarily electrostatic roles for the R96 and E222 side chains in chromophore formation and suggest that the T62 carbonyl oxygen is the base that initiates the dehydration reaction. Our molecular mechanism provides the basis for understanding and eventually controlling chromophore creation.


    Organizational Affiliation

    Department of Molecular Biology, The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
green-fluorescent proteinA228Aequorea victoriaMutation(s): 6 
Gene Names: GFP
Find proteins for P42212 (Aequorea victoria)
Explore P42212 
Go to UniProtKB:  P42212
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download CCD File 
A
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CRO
Query on CRO
AL-PEPTIDE LINKINGC15 H17 N3 O5THR, TYR, GLY
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.145 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.515α = 90
b = 62.388β = 90
c = 71.038γ = 90
Software Package:
Software NamePurpose
SHELXmodel building
SHELXL-97refinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-09-30
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance