From folded to crosslinked proteins. A new promising photo-crosslinking/mass spectrometry method for the structural characterisation of folded proteins is highlighted. A reactive photo-leucine can clamp the front residues in β-turn and β-hairpin domains, thus allowing us to look into the specific native 3D structure of proteins.
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http://dx.doi.org/10.1002/cbic.201200742 | DOI Listing |
J Am Chem Soc
December 2024
Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States.
The Blue Light Using FAD (BLUF) photoreceptor utilizes a noncovalently bound FAD to absorb light and trigger the initial ultrafast events in receptor activation. FAD undergoes 1 and 2 electron reduction as an enzyme redox cofactor, and studies on the BLUF photoreceptor PixD revealed the formation of flavin radicals (FAD and FADH) during the photocycle, supporting a general mechanism for BLUF operation that involves PCET from a conserved Tyr to the oxidized FAD. However, no radical intermediates are observed in the closely related BLUF proteins AppA and BlsA, and replacing the conserved Tyr with fluoro-Tyr analogs that increase the acidity of the phenol OH has a minor effect on AppA photoactivation in contrast to PixD where the photocycle is halted at FAD.
View Article and Find Full Text PDFJ Am Chem Soc
October 2024
State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University, Shenzhen 518055, China.
Naturally, kinases exert their activities in a highly regulated fashion. A number of ingenious approaches have been developed to artificially control kinase activity by external stimuli, such as the incorporation of unnatural amino acids or the fusion of additional protein domains; however, methods that directly modulate endogenous kinases in native cells are lacking. Herein, we present a facile and potent method that takes advantage of recent developments in targeted covalent inhibitors and rapid light-mediated uncaging chemistry.
View Article and Find Full Text PDFbioRxiv
September 2024
Department of Chemistry and Biochemistry, University of Mississippi, Oxford, Mississippi 38677, United States.
Dalton Trans
October 2024
Lomonosov Moscow State University, Department of Chemistry, 1-3, Leninskie Gory, Moscow, 119991, Russia.
Dinuclear complexes bearing Ru(II) photoactive centers are of interest for the development of efficient dual catalysts for many photocatalyzed reactions. Ditopic polypyridine ligands, bis(pyridin-2-yl)amino-1,10-phenanthrolines, containing an additional coordination site (bis(pyridin-2-yl)amine, dpa) at positions 3, 4 or 5 of the 1,10-phenanthroline core (Phen-3NPy2, Phen-4NPy2 and Phen-5NPy2) were synthesized. They were used as bridging ligands to obtain dinuclear complexes [(bpy)Ru(Phen-NPy2)PdCl](PF) (Ru(Phen-NPy2)Pd) in good yields stepwise complexation.
View Article and Find Full Text PDFStructure
November 2024
Department of Chemistry - BMC, Biochemistry, Uppsala University, 75123 Uppsala, Sweden. Electronic address:
Phytochromes are photoreceptor proteins in plants, fungi, and bacteria. They can adopt two photochromic states with differential biochemical responses. The structural changes transducing the signal from the chromophore to the biochemical output modules are poorly understood due to challenges in capturing structures of the dynamic, full-length protein.
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