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Figure 1
The structure of GFP from A. victoria. (a) The GFP structure as viewed from the top of the β-barrel, showing the chromophore and the interacting residues. The residue names are shown for wild-type GFP, while the structure of the E222Q variant determined in this research is used as the model. (b) The dual protonation states of the chromophore.

IUCrJ
Volume 6| Part 3| May 2019| Pages 387-400
ISSN: 2052-2525
https://doi.org/10.1107/S205225251900246X