title: Bichromophoric dyes for wavelength shifting of dye-protein fluoromodules.
abstract: Dye-protein fluoromodules consist of fluorogenic dyes and single chain antibody fragments that form brightly fluorescent noncovalent complexes. This report describes two new bichromophoric dyes that extend the range of wavelengths of excitation or emission of existing fluoromodules. In one case, a fluorogenic thiazole orange (TO) was attached to an energy acceptor dye, Cy5. Upon binding to a protein that recognizes TO, red emission due to efficient energy transfer from TO to Cy5 replaces the green emission observed for monochromophoric TO bound to the same protein. Separately, TO was attached to a coumarin that serves as an energy donor. The same green emission is observed for coumarin-TO and TO bound to a protein, but efficient energy transfer allows violet excitation of coumarin-TO, versus longer wavelength, blue excitation of monochromophoric TO. Both bichromophores exhibit low nanomolar KD values for their respective proteins, >95% energy transfer efficiency and high fluorescence quantum yields.
authors: Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA 15213, USA.
authors: Ha H
authors: HH
authors: Pham
authors: Christopher
authors: C
authors: Szent-Gyorgyi
authors: Wendy L
authors: WL
authors: Brotherton
authors: Brigitte F
authors: BF
authors: Schmidt
authors: Kimberly J
authors: KJ
authors: Zanotti
authors: Alan S
authors: AS
authors: Waggoner
authors: Bruce A
authors: BA
authors: Armitage
mesh_terms: D052160:Benzothiazoles / Q000737:chemistry; D003374:Coumarins / Q000737:chemistry; D031541:Fluorescence Resonance Energy Transfer; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D008027:Light; D018613:Microscopy, Confocal; D011506:Proteins / Q000378:metabolism*; D011804:Quinolines / Q000737:chemistry; D012441:Saccharomyces cerevisiae / Q000166:cytology; D013056:Spectrophotometry, Ultraviolet
chemical_list: D052160:Benzothiazoles; D003374:Coumarins; D005456:Fluorescent Dyes; D011506:Proteins; D011804:Quinolines; C051000:thiazole orange; C030123:coumarin