ALFA sdAb - N1505-250ug

The ALFA-tag is a novel, rationally designed epitope tag (SRLEEELRRRLTE) that forms a small and stable α-helix that is functional irrespective of its position on the target protein in prokaryotic and eukaryotic hosts.
The ALFA-tag has the broadest spectrum of applications in life sciences compared to any other tag. NanoTag developed a nanobody binding the ALFA-tag with ~26 pM affinity, which is ideally suited not only for super-resolution microscopy, immunoprecipitations and Western blotting, but also allows detection of proteins within living cells. This nanobody can be conjugated to virtually all kinds of fluorophores, enyzmes or other biomolecules.
Unlabeled variants and several modifications of sdAbs like biotin, fluorophore or DBCO conjugation are available.

In FluoTag®-X2 two fluorophore molecules are site-specifically coupled to each FluoTag molecule. Therefore, the reagent simultaneously targets two  fluorophores to the protein of interest, which ensures up to two-fold („2X“)-brighter signals. Owing to the small size of the FluoTags, the distance between the target epitope and each fluorophore is ~ 3 nm.
In comparison to detection systems using conventional antibodies, FluoTag-X can thus improve the localization accuracy by 10-15 nm. Both features - superior brightness and precise fluorophore placement - render the FluoTag-X products excellent tools for all microscopy techniques.