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  • Title: Target-binding proteins based on the 10th human fibronectin type III domain (¹⁰Fn3).
    Author: Koide S, Koide A, Lipovšek D.
    Journal: Methods Enzymol; 2012; 503():135-56. PubMed ID: 22230568.
    Abstract:
    We describe concepts and methods for generating a family of engineered target-binding proteins designed on the scaffold of the 10th human fibronectin type III domain ((10)Fn3), an extremely stable, single-domain protein with an immunoglobulin-like fold but lacking disulfide bonds. Large libraries of possible target-binding proteins can be constructed on the (10)Fn3 scaffold by diversifying the sequence and length of its surface loops, which are structurally analogous to antibody complementarity-determining regions. Target-binding proteins with high affinity and specificity are selected from (10)Fn3-based libraries using in vitro evolution technologies such as phage display, mRNA display, or yeast-surface display. (10)Fn3-based target-binding proteins have binding properties comparable to those of antibodies, but they are smaller, simpler in architecture, and more user-friendly; as a consequence, these proteins are excellent building blocks for the construction of multidomain, multifunctional chains. The ease of engineering and robust properties of (10)Fn3-based target-binding proteins have been validated by multiple independent academic and industrial groups. In addition to performing well as specific in vitro detection reagents and research tools, (10)Fn3-based binding proteins are being developed as therapeutics, with the most advanced candidate currently in Phase II clinical trials.
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