Spot-Tag Cloning Vectors

Create Your Own Spot-Tag Protein

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These 12 amino acids will make all the difference
The Spot-Tag Fusion Protein System is the first “create-your-own” peptide-tag specifically designed for use with the “nanobody” suite of products. Nanobodies are small, high-performance fragments of monoclonal antibodies that show superior performance across a wide range of detection, purification, and imaging applications. This connection allows any lab to easily construct and express a single Spot-Tag fusion protein, which can then be used with any of our capture or detection applications. For example, the Spot-Trap Affinity Reagents can be used to purify any Spot-Tagged protein in a single step, whether by a simple immunoprecipitation or by ultrapure affinity purification–even under gentle conditions that preserve protein function. The same Spot-Tagged protein can also be detected with the tiny and rugged Spot-Label, which will specifically bind for ultra-sensitive Western blotting, ultra-bright immunofluorescence, or even super-resolution microscopy.

The Spot-Tag system is fully validated! The Spot-Tag sequence is: PDRVRAVSHWSS. It’s just 1.4kDa, and can easily be placed at either the C-terminus or the N-terminus without impacting your target protein’s function. In practical experiments, it has proven to be completely inert, easy to clone, and to have robust levels of expression in bacteria, yeast, mammalian, and insect cell lines. The Spot-Nanobody’s sequence and structure are known as well; its binding mechanism with Spot-Tag has been elucidated. Spot-Nanobody is produced recombinantly for consistently high quality. Precise production guarantees performance no matter the configuration: affinity purification (Spot-Trap), immunoprecipitation (Spot-Trap), Westerns (Spot-Label monovalent form), and immunofluorescence (Spot-Label divalent form) are all possible.

Spot advantages compared to Flag
More robust & stable
Higher affinity
Less background
Higher resolution
Less negatively charged
Shorter than other tags
Less nonspecific binding

N-terminus and C-terminus
Codon optimized sequences for Spot-Tag:

Optional Linker
We recommend a short Gly-Ser linker, if there are adjacent acidic amino acids (Glu/Asp):
E. coli: GGTTCT
S. cerevisiae: GGTTCT
Human cell line: GGCAGC

Spot vectors for cloning

Vector Data- sheet Sequence file
pSpot1 vector, E. coli, Spot-tag N-term., Kan., high expression ev-1.pdf
pSpot2 vector,  E. coli, Spot-tag C-term., Kan., high expression ev-2.pdf
pSpot3 vector, E. coli, Spot-tag C-term., Amp., low expression ev-3.pdf
pSpot4 vector,  E. coli, Spot-tag N-term., Amp., low expression ev-4.pdf
pSpot5 vector, S. cerevisiae, Spot-tag N-term., Leu, CEN, low expression ev-5.pdf
pSpot6 vector, S. cerevisiae, Spot-tag C-term., Leu, CEN, low expression ev-6.pdf
pSpot7 vector, S. cerevisiae, Spot-tag N-term., Leu, 2µ, high expression ev-7.pdf
pSpot8 vector, S. cerevisiae, Spot-tag C-term., Leu, 2µ, high expression ev-8.pdf

Configuration: DNA Plasmid
Amount: 1.25 µg
Expression Level: High and low expression plasmids available
Resistance: Kan, Amp, & Leu avaiable
Spot-Tag Amini Acid Sequence: PDRVRAVSHWSS
Part Numbers pSpot1, pSpot2, pSpot3, pSpot4, pSpot5, pSpot6, pSpot7, pSpot8, EP1
Storage: store at -20°C