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FEBS J. 2008 Jun;275(11):2668-76. doi: 10.1111/j.1742-4658.2008.06438.x. Epub 2008 Apr 24.

Alternative binding proteins: affibody binding proteins developed from a small three-helix bundle scaffold.

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Department of Molecular Biotechnology, School of Biotechnology, Royal Institute of Technology KTH, Stockholm, Sweden.


In recent years, classical antibody-based affinity reagents have been challenged by novel types of binding proteins developed by combinatorial protein engineering principles. One of these classes of binding proteins of non-Ig origin are the so-called affibody binding proteins, functionally selected from libraries of a small (6 kDa), non-cysteine three-helix bundle domain used as a scaffold. During the first 10 years since they were first described, high-affinity affibody binding proteins have been selected towards a large number of targets for use in a variety of applications, such as bioseparation, diagnostics, functional inhibition, viral targeting and in vivo tumor imaging/therapy. The small size offers the possibility to produce functional affibody binding proteins also by chemical synthesis production routes, which has been found to be advantageous for the site-specific introduction of various labels and radionuclide chelators.

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