5btt

Switching GFP fluorescence using genetically encoded phenyl azide chemistry through two different non-native post-translational modifications routes at the same position.

spinqualitylabelsall models 5btt, resolution 2.14Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5btt is a 2 chain structure with sequence from Aequorea victoria. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.14Å Ligands: 4V0, CRO, GOL, HOX, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A059PIQ0_AEQVI Publication Abstract from PubMed Through the genetic incorporation of a single phenyl azide group into superfolder GFP (sfGFP) at residue 148 we provide a molecular description of how this highly versatile chemical handle can be used to positively switch protein function in vitro and in vivo via either photochemistry or bioconjugation. Replacement of H148 with p-azido-l-phenylalanine (azF) blue shifts the major excitation peak approximately 90 nm by disrupting the H-bond and proton transfer network that defines the chromophore charged state. Bioorthogonal click modification with a simple dibenzylcyclooctyne or UV irradiation shifts the neutral-anionic chromophore equilibrium, switching fluorescence to the optimal approximately 490 nm excitation. Click modification also improved quantum yield over both the unmodified and original protein. Crystal structures of both the click modified and photochemically converted forms show that functional switching is due to local conformational changes that optimise the interaction networks surrounding the chromophore. Crystal structure and mass spectrometry studies of the irradiated protein suggest that the phenyl azide converts to a dehydroazepine and/or an azepinone. Thus, protein embedded phenyl azides can be used beyond simple photocrosslinkers and passive conjugation handles, and mimic many natural post-translational modifications: modulation though changes in interaction networks. Molecular basis for functional switching of GFP by two disparate non-native post-translational modifications of a phenyl azide reaction handle.,Hartley AM, Worthy HL, Reddington SC, Rizkallah PJ, Jones DD Chem Sci. 2016 Oct 1;7(10):6484-6491. doi: 10.1039/c6sc00944a. Epub 2016 Jun 29. PMID:28451106 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Green Fluorescent Protein 3D structures

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