2yfp

STRUCTURE OF YELLOW-EMISSION VARIANT OF GFP

spinqualitylabelsall models 2yfp, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2yfp is a 1 chain structure with sequence from Aequorea victoria. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CR2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function GFP_AEQVI Energy-transfer acceptor. Its role is to transduce the blue chemiluminescence of the protein aequorin into green fluorescent light by energy transfer. Fluoresces in vivo upon receiving energy from the Ca(2+)-activated photoprotein aequorin. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed BACKGROUND: Because of its ability to spontaneously generate its own fluorophore, the green fluorescent protein (GFP) from the jellyfish Aequorea victoria is used extensively as a fluorescent marker in molecular and cell biology. The yellow fluorescent proteins (YFPs) have the longest wavelength emissions of all GFP variants examined to date. This shift in the spectrum is the result of a T203Y substitution (single-letter amino acid code), a mutation rationally designed on the basis of the X-ray structure of GFP S65T. RESULTS: We have determined the crystal structures of YFP T203Y/S65G/V68L/S72A and YFP H148G to 2.5 and 2.6 A resolution, respectively. Both structures show clear electron density for nearly coplanar pi-pi stacking between Tyr203 and the chromophore. The chromophore has been displaced by nearly 1 A in comparison to other available structures. Although the H148G mutation results in the generation of a solvent channel to the chromophore cavity, intense fluorescence is maintained. The chromophore in the intact protein can be titrated, and the two variants have pKa values of 7.0 (YFP) and 8.0 (YFP H148G). CONCLUSIONS: The observed red shift of the T203Y YFP variant is proposed to be mainly due to the additional polarizability of the pi-stacked Tyr203. The altered location of the chromophore suggests that the exact positions of nearby residues are not crucial for the chemistry of chromophore formation. The YFPs significantly extend the pH range over which GFPs may be employed as pH indicators in live cells. Structural basis of spectral shifts in the yellow-emission variants of green fluorescent protein.,Wachter RM, Elsliger MA, Kallio K, Hanson GT, Remington SJ Structure. 1998 Oct 15;6(10):1267-77. PMID:9782051 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Green Fluorescent Protein 3D structures

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