5H89
Crystal structure of mRojoA mutant - T16V - P63Y - W143G - L163V
Summary for 5H89
| Entry DOI | 10.2210/pdb5h89/pdb |
| Related | 5H87 5H88 |
| Descriptor | mRojoA fluorescent protein (2 entities in total) |
| Functional Keywords | quantum yield, protein engineering, fluorescent protein |
| Biological source | Discosoma sp. |
| Total number of polymer chains | 4 |
| Total formula weight | 110504.20 |
| Authors | Pandelieva, A.T.,Tremblay, V.,Sarvan, S.,Chica, R.A.,Couture, J.-F. (deposition date: 2015-12-23, release date: 2016-01-27, Last modification date: 2024-10-30) |
| Primary citation | Pandelieva, A.T.,Baran, M.J.,Calderini, G.F.,McCann, J.L.,Tremblay, V.,Sarvan, S.,Davey, J.A.,Couture, J.F.,Chica, R.A. Brighter Red Fluorescent Proteins by Rational Design of Triple-Decker Motif. Acs Chem.Biol., 11:508-517, 2016 Cited by PubMed Abstract: Red fluorescent proteins (RFPs) are used extensively in chemical biology research as fluorophores for live cell imaging, as partners in FRET pairs, and as signal transducers in biosensors. For all of these applications, brighter RFP variants are desired. Here, we used rational design to increase the quantum yield of monomeric RFPs in order to improve their brightness. We postulated that we could increase quantum yield by restricting the conformational degrees of freedom of the RFP chromophore. To test our hypothesis, we introduced aromatic residues above the chromophore of mRojoA, a dim RFP containing a π-stacked Tyr residue directly beneath the chromophore, in order to reduce chromophore conformational flexibility via improved packing and steric complementarity. The best mutant identified displayed an absolute quantum yield increase of 0.07, representing an over 3-fold improvement relative to mRojoA. Remarkably, this variant was isolated following the screening of only 48 mutants, a library size that is several orders of magnitude smaller than those previously used to achieve equivalent gains in quantum yield in other RFPs. The crystal structure of the highest quantum yield mutant showed that the chromophore is sandwiched between two Tyr residues in a triple-decker motif of aromatic rings. Presence of this motif increases chromophore rigidity, as evidenced by the significantly reduced temperature factors compared to dim RFPs. Overall, the approach presented here paves the way for the rapid development of fluorescent proteins with higher quantum yield and overall brightness. PubMed: 26697759DOI: 10.1021/acschembio.5b00774 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.76 Å) |
Structure validation
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