3CB9

Development of a family of redox-sensitive green fluorescent protein indicators for use in relatively oxidizing subcellular environments


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.31 Å
  • R-Value Free: 0.169 
  • R-Value Work: 0.152 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Development of a family of redox-sensitive green fluorescent protein indicators for use in relatively oxidizing subcellular environments

Lohman, J.R.Remington, S.J.

(2008) Biochemistry 47: 8678-8688

  • DOI: 10.1021/bi800498g
  • Primary Citation of Related Structures:  3CBE, 3CD1, 3CD9

  • PubMed Abstract: 
  • Green fluorescent protein (GFP) indicators were previously developed that rapidly and quantitatively respond to changes in the thiol/disulfide equilibrium within subcellular compartments. In these indicators, surface-exposed cysteines residues were i ...

    Green fluorescent protein (GFP) indicators were previously developed that rapidly and quantitatively respond to changes in the thiol/disulfide equilibrium within subcellular compartments. In these indicators, surface-exposed cysteines residues were introduced so as to form a labile redox-active disulfide that in turn controls the emission properties of the internal chromophore. The biosensors have been shown to be effective reporters of the thiol/disulfide status within reducing compartments such as the mitochondria and cytosol for several cell types. However, due to the high thermodynamic stability of the introduced disulfide bond, the indicators are not useful for quantitative analysis within more oxidizing compartments such as the endoplasmic reticulum. Here we report the development of a new family of GFP-based redox indicators (roGFP1-iX) in which the thermodynamic stability of the disulfide is substantially lowered by insertion of a single amino acid into the main chain, adjacent to cysteine 147. The insertions result in indicators with midpoint potentials of -229 to -246 mV and are thus better suited for study of relatively oxidizing subcellular compartments. Atomic resolution crystallographic analyses suggest that two important factors act to destabilize the disulfide linkage in roGFP1-iX. In the oxidized state, an unusual non-proline cis-peptide bond adjacent to one of the cysteines introduces geometric strain into the system, while in the reduced state, a dramatic loop opening lowers the effective concentration of the reacting species.


    Organizational Affiliation

    Institute of Molecular Biology and Departments of Chemistry and Physics, University of Oregon, Eugene, Oregon 97403, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Green fluorescent protein
A
250Aequorea victoriaGene Names: GFP
Find proteins for P42212 (Aequorea victoria)
Go to UniProtKB:  P42212
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.31 Å
  • R-Value Free: 0.169 
  • R-Value Work: 0.152 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 51.066α = 90.00
b = 62.701β = 90.00
c = 70.136γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
HKL-2000data scaling
REFMACrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-02-21 
  • Released Date: 2008-08-19 
  • Deposition Author(s): Lohman, J.R.

Revision History 

  • Version 1.0: 2008-08-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance