5h87

Crystal structure of mRojoA mutant - P63H - W143S

spinqualitylabelsall models 5h87, resolution 2.24Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5h87 is a 4 chain structure with sequence from Discosoma sp.. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.24Å Ligands: CH6 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function D1MPT3_DISSP Publication Abstract from PubMed 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 pi-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. Brighter Red Fluorescent Proteins by Rational Design of Triple-Decker Motif.,Pandelieva AT, Baran MJ, Calderini GF, McCann JL, Tremblay V, Sarvan S, Davey JA, Couture JF, Chica RA ACS Chem Biol. 2016 Jan 5. PMID:26697759 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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