luminophore-formation-various-conformations-bovine-serum-albumin

Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of Gold(III)

The purpose of the presented protocols is to study the process of Au(III) binding to BSA, yielding conformation change-induced red fluorescence (&#955;em ...

limited-proteolysis-gel-electrophoresis-presence-metal-cations-au-iii

Limited Proteolysis and Gel Electrophoresis in the Presence of Metal Cations: Au(III)-binding Luminescent Domain in Serum Albumins

The purpose of the presented protocols is to determine the domain of Au(III) binding in BSA. The BSA-Au(III) compound exhibits ultraviolet (UV)-excitable ...

University of North Carolina

The University of North Carolina

We report new findings on the red fluorescent (λ = 640 nm) bovine serum albumin (BSA)-gold (Au) compound initially described by Xie et al. (J. Am. Chem. Soc. 2009, 131, 888-889) as Au nanoclusters. The BSA-Au compounds were further reducible to yield nanoparticles, suggesting that these compounds were BSA-cationic Au complexes. We examined the correlations between BSA conformations (pH-induced as well as denatured) and the resulting fluorescence of BSA-Au complexes, to understand the possible cationic Au binding sites. The red fluorescence of the BSA-Au complex was associated with a particular isoform of BSA, the aged form (pH > 10) of the five pH-dependent BSA conformations, while the other conformations, expanded (pH < 2.7), fast (2.7 < pH < 4.3), normal (4.3 < pH < 8), and basic (8 < pH < 10) did not result in red fluorescence. There could be internal energy transfer mechanisms to produce red fluorescence, deduced from excitation-emission map measurements. The ensemble minimum number of Au(III) per BSA to yield red fluorescence was <7. We illustrate the presence of multiple specific Au binding sites in BSA, and present an interpretation of the fluorescence of the BSA-Au complex, alternative to a single-site nucleation of a neutral Au nanocluster.

Jacob M. Dixon

Department of Physics and Optical Science,
Center for Biomedical Engineering & Science,
Department of Physics and Optical Science, Center for Biomedical Engineering & Science

University of North Carolina

Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of Gold(III)

Limited Proteolysis and Gel Electrophoresis in the Presence of Metal Cations: Au(III)-binding Luminescent Domain in Serum Albumins

Jacob M. Dixon

Department of Physics and Optical Science,Center for Biomedical Engineering & Science,Department of Physics and Optical Science, Center for Biomedical Engineering & Science

University of North Carolina

Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of Gold(III)

Limited Proteolysis and Gel Electrophoresis in the Presence of Metal Cations: Au(III)-binding Luminescent Domain in Serum Albumins

Department of Physics and Optical Science,
Center for Biomedical Engineering & Science,
Department of Physics and Optical Science, Center for Biomedical Engineering & Science