Affinity optimized short peptide tag

Spot-Tag

Affinity Optimized Short Peptide Tag

The Spot-Tag^® has an affinity-optimized 12 amino acid sequence PDRVRAVSHWSS. The Spot-Tag is strongly bound by the Spot-Nanobody. The inert tag sequence can be added to the N-terminal and to the C-terminal side of the protein of interest. This works by PCR using modified primers or by using any of the Spot vectors offered (click here for more information). The expression of Spot-tagged proteins has been successfully tested in bacteria, yeast, mammalian cell lines, and insect cells.

Spot-Nanobody advantages compared to other antibodies:	Spot-Tag advantages compared to other peptide tags:
More robust & stable than IgG antibodies High affinity of 6 nM Less background than other tested affinity resins Less unspecific binding than other tested capture and detection antibodies Higher resolution than conventional antibodies Better epitope accessibility and tissue penetration than conventional IgG antibodies	Less negatively charged than FLAG^®-, Myc-, and HA-tags Short Inert Suitable for ubiquitination assays: comprises no lysine

Overview of Spot related products by application

Immunoprecipitation (IP) & affinity purification use Spot-Trap^®. Spot-Trap is the Spot-Nanobody coupled to agarose or magnetic agarose beads.

NO contaminating heavy & light antibody chains
Harsh washing conditions
Native & non-native elution
High affinity, stringent wash

Immunofluorescence (IF) & Western blotting (WB) use Spot-Label. Spot-Label is the bivalent Spot-Nanobody conjugated to fluorescent dyes. Spot-Label is the first Nanobody/ peptide-tag that was applied in super-resolution microscopy.

Higher resolution
Better epitope access & tissue penetration
Very small probe size

For expression of Spot-tagged fusion proteins use Spot-Tag vectors. A selection of vectors is available. Alternatively, Spot-Tag can be easily cloned by PCR primers.

For gentle & native elution of bound Spot-tagged proteins use Spot peptide.

Non-conjugated Spot-Nanobody is called Spot VHH, recombinant binding protein:

Very sensitive in Western blot and ELISA
Coupling of dyes, biotin, etc. via NHS Ester reaction

Free samples available

Request free sample here and test Spot in your experiment.