Thermo Scientific DyLight Fluor Phosphine Reagents are phosphine-activated fluorescent dyes for specific labeling and detection of azide-tagged molecules, which enables use of fluorescence imaging in metabolic labeling strategies.

• Easily Dissolves in Water-Miscible Solvents (eg. DMSO) for Subsequent Dilution in Aqueous Reaction Mixtures with Cell Lysates and Other Biological Samples
• Reaction Chemistry Occurs Effectively in Simple Buffer Conditions Requiring no Accessory Reagents Such as Copper or Reducing Agents, and does not Interfere with Fluorescence Applications
• The phosphine Reactive Group is Specific in Biological Samples for Bioorthogonal Azide-Tagged Molecules, Ensuring that Fluorescent Labeling is Specific
• DyLight™ 488, 550 and 650 are Intense, Highly Stable Fluorophores for Green, Orange and Red Fuorescent Detection

When used in combination with azide labeling strategies, phosphine-activated DyLight Fluors enable selective fluorescent labeling for detection of protein interactions and post-translational modifications using fluorescence imaging technologies. The phosphine group conjugates to azide groups by the Staudinger reaction mechanism. Azide groups can be introduced into proteins or other cellular targets through in vivo labeling with azide-tagged derivatives of naturally occurring metabolic building blocks. Because neither phosphines nor azides are present in biological systems, they comprise a chemoselective (mutually specific) ligation pair for labeling and conjugation.