Photoswitchable fluorescent protein Gamillus, off-state

Experimental Data Snapshot

  • Resolution: 1.96 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.153 

wwPDB Validation   3D Report Full Report

This is version 2.1 of the entry. See complete history


Acid-Tolerant Reversibly Switchable Green Fluorescent Protein for Super-resolution Imaging under Acidic Conditions.

Shinoda, H.Lu, K.Nakashima, R.Wazawa, T.Noguchi, K.Matsuda, T.Nagai, T.

(2019) Cell Chem Biol 26: 1469-1479.e6

  • DOI: https://doi.org/10.1016/j.chembiol.2019.07.012
  • Primary Citation of Related Structures:  
    6J1A, 6J1B, 6J1C, 6JXF

  • PubMed Abstract: 

    Reversibly switchable fluorescent proteins (RSFPs) are crucial tags for super-resolution observation of protein localization and dynamics inside living cells. However, due to the high fluorescence pK a (∼5-6) of most RSFPs, their usage in acidic conditions (pH 4.5-6.0) has been limited. Here, we investigated a new photochromic mechanism in Gamillus, a recently developed green fluorescent protein with acid tolerance. Gamillus exhibits negative switching with especially high contrast in acidic conditions, and its off switching is caused by trans-to-cis isomerization of the chromophore hydroxyphenyl ring that accompanies protonation. Through a combination of rational design and saturation mutagenesis, we developed two variants with enhanced switching contrasts and off-switching speeds, designated rsGamillus-S and rsGamillus-F, respectively. The fluorescence intensity, off-switching speed, and switching contrast of the rsGamillus variants are only slightly affected by changes in pH between 4.5 and 7.5. Exploiting these properties, we succeeded in high-contrast super-resolution imaging of cellular architectures in acidic conditions.

  • Organizational Affiliation

    The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Green fluorescent protein271OlindiasMutation(s): 0 
Find proteins for A0A2Z5X7U3 (Olindias formosus)
Explore A0A2Z5X7U3 
Go to UniProtKB:  A0A2Z5X7U3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A2Z5X7U3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.96 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.153 
  • Space Group: I 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 161.54α = 90
b = 161.54β = 90
c = 161.54γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
MOSFLMdata reduction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-11-06
    Type: Initial release
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection, Database references, Derived calculations
  • Version 2.1: 2023-11-22
    Changes: Refinement description