X-ray structure of ReQy1 (reduced form)

Experimental Data Snapshot

  • Resolution: 2.39 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Multicolor redox sensor proteins can visualize redox changes in various compartments of the living cell.

Sugiura, K.Tanaka, H.Kurisu, G.Wakabayashi, K.I.Hisabori, T.

(2019) Biochim Biophys Acta Gen Subj 1863: 1098-1107

  • DOI: https://doi.org/10.1016/j.bbagen.2019.01.016
  • Primary Citation of Related Structures:  
    6AA2, 6AA6

  • PubMed Abstract: 

    Change in the intracellular redox state is a consequence of various metabolic reactions, which simultaneously regulates various physiological phenomena in cells. Monitoring the redox state in living cells is thus very important for understanding cellular physiology. Various genetically encoded fluorescent redox sensors have therefore been developed. Recently, we developed oxidation-sensitive fluorescent proteins named Oba-Q (Sugiura, K., et al. (2015) Biochem. Biophys. Res. Commun. 457, 242-248), which exhibit dramatic quenching under oxidizing conditions. To extend the range of uses of redox sensor proteins, we refined these proteins based on the molecular architecture applied to Oba-Q, and successfully produced several redox sensor proteins based on CFP and YFP. Interestingly, some of these sensor proteins showed the reverse changes in emission compared with Oba-Q, implying remarkable fluorescence quenching under reducing conditions. We named this type of sensor protein Re-Q, reduction-sensed quenching protein. The cause of the redox-dependent fluorescence quenching could be clearly explained based on the crystal structure of Re-Q in the reduced and oxidized forms. In addition, by introducing suitable mutations into the sensors, we produced Oba-Q and Re-Q mutants exhibiting various midpoint redox potentials. This series of proteins can cover a wide range of redox potentials in the cell, so they should be applicable to various cells and even intracellular organelles. As an example, we successfully measured the redox responses in different cell compartments of cultured mammalian cells simultaneously against the anticancer reagents Kp372-1.

  • Organizational Affiliation

    Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Nagatsuta-cho 4259, Midori-ku, Yokohama 226-8503, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Green fluorescent protein
A, B
249Aequorea victoriaMutation(s): 14 
Gene Names: GFP
Find proteins for P42212 (Aequorea victoria)
Explore P42212 
Go to UniProtKB:  P42212
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42212
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on CR2
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 2.39 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.009α = 90
b = 70.562β = 94.77
c = 65.069γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Ministry of Education, Culture, Sports, Science and Technology (Japan)JapanA16H065600

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-29
    Type: Initial release
  • Version 1.1: 2023-11-22
    Changes: Data collection, Database references, Refinement description