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Huber, Thomas; Steiner, Daniel; Röthlisberger, Daniela; Plückthun, Andreas
Journal of structural biology 159, Številka: 2Journal Article
The determination of 3D structures of membrane proteins is still extremely difficult. The co-crystallization with specific binding proteins may be an important aid in this process, as these proteins provide rigid, hydrophilic surfaces for stable protein–protein contacts. Also, the conformational homogeneity of the membrane protein may be increased to obtain crystals suitable for high resolution structures. Here, we describe the efficient generation and characterization of Designed Ankyrin Repeat Proteins (DARPins) as specific binding molecules for membrane proteins. We used both phage display and ribosome display to select DARPins in vitro that are specific for the detergent-solubilized Na +-citrate symporter CitS of Klebsiella pneumoniae. Compared to classical hybridoma technology, the in vitro selection systems allow a much better control of the structural integrity of the target protein and allow the use of other protein classes in addition to recombinant antibodies. We also compared the selected DARPins to a Fab fragment previously selected by phage display and demonstrate that different epitopes are recognized, unique to each class of binding molecules. Therefore, the use of several classes of binding molecules will make suitable crystal formation and the determination of their 3D structure more likely.
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