期刊
PROTEIN ENGINEERING DESIGN & SELECTION
卷 22, 期 11, 页码 685-690出版社
OXFORD UNIV PRESS
DOI: 10.1093/protein/gzp053
关键词
directed evolution; high-throughput selection; monobodies; synthetic binding proteins
资金
- National Institutes of Health [R01-GM72688, U54 GM74946, R21-CA132700]
- University of Chicago Cancer Research Center
Immobilization of a target molecule to a solid support is an indispensable step in phage display library sorting. Here we describe an immobilization method that addresses shortcomings of existing strategies. Our method is based on the use of a polyhistidine-tagged (His-tagged) target molecule and BT tris-NTA, a high-affinity capture reagent for His-tags that also contains a biotin moiety. BT tris-NTA provides a stable and reversible linkage between a His-tag and a streptavidin-coated solid support. Because His-tags are the de facto standard for recombinant protein purification, this method dramatically simplifies target preparation for phage display library sorting. Here, we demonstrate the utility of this method by selecting high-affinity binding proteins based on the fibronectin type III (FN3) scaffold to two His-tagged protein targets, yeast small ubiquitin-like modifier and maltose-binding protein. Notably, a significant number of FN3 clones binding either targets selected using the new immobilization method exhibited only very weak binding when the same target was immobilized by coating on a polystyrene surface. This suggests that the His-tag-mediated immobilization exposes epitopes that are masked by commonly used passive adsorption methods. Together, these results establish a method with the potential to streamline and enhance many bindingprotein engineering experiments.
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