7RRH
Crystal structure of fast switching R66M/M159T mutant of fluorescent protein Dronpa (Dronpa2)
Summary for 7RRH
| Entry DOI | 10.2210/pdb7rrh/pdb |
| Descriptor | Fluorescent protein Dronpa (2 entities in total) |
| Functional Keywords | dronpa2, fluorescent protein |
| Biological source | Echinophyllia sp. SC22 |
| Total number of polymer chains | 6 |
| Total formula weight | 173613.48 |
| Authors | Lin, C.-Y.,Romei, M.G.,Mathews, I.I.,Boxer, S.G. (deposition date: 2021-08-09, release date: 2021-10-13, Last modification date: 2024-11-13) |
| Primary citation | Lin, C.Y.,Romei, M.G.,Mathews, I.I.,Boxer, S.G. Energetic Basis and Design of Enzyme Function Demonstrated Using GFP, an Excited-State Enzyme. J.Am.Chem.Soc., 144:3968-3978, 2022 Cited by PubMed Abstract: The past decades have witnessed an explosion of protein designs with a remarkable range of scaffolds. It remains challenging, however, to design catalytic functions that are competitive with naturally occurring counterparts as well as biomimetic or nonbiological catalysts. Although directed evolution often offers efficient solutions, the fitness landscape remains opaque. Green fluorescent protein (GFP), which has revolutionized biological imaging and assays, is one of the most redesigned proteins. While not an enzyme in the conventional sense, GFPs feature competing excited-state decay pathways with the same steric and electrostatic origins as conventional ground-state catalysts, and they exert exquisite control over multiple reaction outcomes through the same principles. Thus, GFP is an "excited-state enzyme". Herein we show that rationally designed mutants and hybrids that contain environmental mutations and substituted chromophores provide the basis for a quantitative model and prediction that describes the influence of sterics and electrostatics on excited-state catalysis of GFPs. As both perturbations can selectively bias photoisomerization pathways, GFPs with fluorescence quantum yields (FQYs) and photoswitching characteristics tailored for specific applications could be predicted and then demonstrated. The underlying energetic landscape, readily accessible via spectroscopy for GFPs, offers an important missing link in the design of protein function that is generalizable to catalyst design. PubMed: 35200017DOI: 10.1021/jacs.1c12305 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.747 Å) |
Structure validation
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