TCO-PEG4-TFP Ester
TCO-PEG4-TFP Ester is an amine-reactive, labeling reagent used to modify proteins, antibodies, and other amine-containing biopolymers. The hydrophilic polyethylene glycol (PEG) spacer arm imparts water solubility and provides a long and flexible connection that minimizes steric hindrance involved with ligation to complementary tetrazine-containing molecules.
The N-hydroxysuccinimide (NHS, also known as HOSu) esters of carboxylic acids are the most widely used reactive esters for modifying amine-containing peptides and proteins. NHS esters are notorious for having a short, pH-dependent half-life in aqueous media. A 2,3,5,6-tetrafluorophenol (TFP) is a different type of reactive ester that displays much better stability toward hydrolysis in aqueous media resulting in more efficiency and better reproducible labeling of biopolymers. TFP ester of carboxylic acids react with primary amines at the same rate as NHS ester forming covalent amide bond that is identical to one formed by the reaction between primary amines and NHS esters or sulfo-NHS esters.
1. Kang, D., et al. (2021). Bioorthogonal Retro-Cope Elimination Reaction of N, N-Dialkylhydroxylamines and Strained Alkynes. J Am Chem Soc., 143 (15), 5616-5621. [PubMed]
Abs/Em Maxima: 346/445 nmExtinction Coefficient: 19,000Spectrally Similar Dyes: Alexa Fluor? 350, CF? 350, DyLight 350, AMCAAZDye? 350 is a blue-fluorescent azide-activated probe that reacts with terminal alkynes via a copper-catalyzed click react…
Abs/Em Maxima: 402/424 nmExtinction Coefficient: 35,000Flow Cytometry Laser Line: 405 nmMicroscopy Laser Line: 405 nmSpectrally Similar Dyes: Alexa Fluor? 405, CF? 405, Cascade Blue?, DyLight? 405AZDye? 405 Azide is a water-soluble, pH-insensiti…
Abs/Em Maxima: 346/445 nmExtinction Coefficient: 19,000Spectrally Similar Dyes: Alexa Fluor? 350, CF? 350, DyLight 350, AMCAAZDye? 350 Alkyne (Alexa Fluor? 350 Alkyne equivalent) is a blue-fluorescent, alkyne-activated probe that reacts with azid…
Abs/Em Maxima: 430/537 nmExtinction Coefficient: 15,000Spectrally Similar Dyes: Alexa Fluor? 430, CF? 430AZDye? 430 Azide is a water-soluble, green-fluorescent azide-activated probe that reacts with terminal alkynes via a copper-catalyzed click re…
Abs/Em Maxima: 346/445 nmExtinction Coefficient: 19,000Spectrally Similar Dyes: Alexa Fluor? 350, CF? 350, DyLight 350, AMCAAZDye? 350 DBCO reacts with azides via a copper-free “click chemistry” reaction to form a stable triazole and does not re…
Abs/Em Maxima: 402/424 nmExtinction Coefficient: 35,000Flow Cytometry Laser Line: 405 nmMicroscopy Laser Line: 405 nmSpectrally Similar Dyes: Alexa Fluor? 405, CF? 405, Cascade Blue?, DyLight? 405AZDye? 405 Alkyne reacts with azides via a copper…
Abs/Em Maxima: 494/517 nmExtinction Coefficient: 73.000Flow Cytometry Laser Line: 488 nmMicroscopy Laser Line: 488 nmSpectrally Similar Dyes: Fluorescein, Alexa Fluor? 488, CF? 488A, DyLight? 488, Atto? 488AZDye? 488 Azide (Alexa Fluor? 488 Azi…
Abs/Em Maxima: 402/424 nmExtinction Coefficient: 35,000Flow Cytometry Laser Line: 405 nmMicroscopy Laser Line: 405 nmSpectrally Similar Dyes: Alexa Fluor? 405, CF? 405, Cascade Blue?, DyLight? 405ZDye? 405 DBCO reacts with azides via a copper-fr…
