2a53 | pdb_00002a53

fluorescent protein asFP595, A143S, off-state

spinqualitylabelsall models 2a53, resolution 1.45Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2a53 is a 4 chain structure with sequence from Anesu. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL NonStd Res: NRQ Related: 2a50, 2a52, 2a54, 2a56 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [NFCP_ANESU] Pigment protein that is intensely purple in color. 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 Proteins that can be reversibly photoswitched between a fluorescent and a nonfluorescent state bear enormous potential in diverse fields, such as data storage, in vivo protein tracking, and subdiffraction resolution light microscopy. However, these proteins could hitherto not live up to their full potential because the molecular switching mechanism is not resolved. Here, we clarify the molecular photoswitching mechanism of asFP595, a green fluorescent protein (GFP)-like protein that can be transferred from a nonfluorescent "off" to a fluorescent "on" state and back again, by green and blue light, respectively. To this end, we establish reversible photoswitching of fluorescence in whole protein crystals and show that the switching kinetics in the crystal is identical with that in solution. Subsequent x-ray analysis demonstrated that upon the absorption of a green photon, the chromophore isomerizes from a trans (off) to a cis (on) state. Molecular dynamics calculations suggest that isomerization occurs through a bottom hula twist mechanism with concomitant rotation of both bonds of the chromophoric methine ring bridge. This insight into the switching mechanism should facilitate the targeted design of photoswitchable proteins. Reversible photoswitching of the protein chromophore system within intact crystals also constitutes a step toward the use of fluorescent proteins in three-dimensional data recording. Structure and mechanism of the reversible photoswitch of a fluorescent protein.,Andresen M, Wahl MC, Stiel AC, Grater F, Schafer LV, Trowitzsch S, Weber G, Eggeling C, Grubmuller H, Hell SW, Jakobs S Proc Natl Acad Sci U S A. 2005 Sep 13;102(37):13070-4. Epub 2005 Aug 31. PMID:16135569 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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