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Strep-tag® and One-STrEP-tag for Protein-protein Interaction Analysis
Sponsored,vendor-submitted protocol   Sponsored by Iba Gmbh    Published in November 2008 (p.55) DOI: 10.2144/000113007

Protein-protein interactions (PPI) govern almost all important processes in living organisms. Thus, their rapid and accurate determination and investigation is a major challenge in life sciences. With four different determination systems based on Strep-tag®II and One-STrEP-tag, we provide optimal solutions for in vivo protein-protein interaction analysis.


One-STrEP Set (Cloning and Purification Kit for Mammalia and Escherichia coli)

One-TAP Set (Cloning and Purification Kit for Mammalia and E. coli)

Two-TAP Set (Cloning and Purification Kit for Mammalia and E. coli)

Spine Set (Cloning and Purification Kit for E. coli) Methods

The One-STrEP system is recommended for getting started. It needs one tag and one purification step only. Due to its excellent performance, this method yields a favorable signal-to-noise ratio in most cases. Mild elution and fast washing allow the isolation of even weekly interacting preys.

In case the One-STrEP system provides suboptimal data, the One-TAP system extends the options of the One-STrEP system since it adds a second independent purification step yet with the same tag. Two different purification steps may better discriminate specific from nonspecific binding but bear the risk of losing weakly interacting partners.

The Two-TAP system is recommended only as an option in case of unsatisfying data with the One-STrEP or One-TAP approach and not as first choice starting point.

In addition to these non-covalent capture methods of potential preys, SPINE adds the possibility to covalently link the preys to its bait by formaldehyde cross-linking. This linkage is achieved in the living organism enabling a time resolved snapshot of interacting proteins. SPINE is currently validated in prokaryotes only but its adaptation to mammalian system is under way. StarGate for Bait Cloning

This novel cloning system is the perfect tool for efficient screening and fast identification of the optimal tag for PPI investigation with a given bait. Once the bait is cloned into a Donor Vector, a large selection of Acceptor Vectors for its expression with different tag arrangements in the desired host is available.


Address correspondence to IBA GmbH Headquarters, Rudolf-Wissell-Strasse 28, 37079 Göttingen, Germany; Tel.: Europe +49 551 50672-0, USA +1 877 422 4624; [email protected],

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