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Product Description
Full-consensus designed ankyrin repeat proteins (DARPins), in which randomized positions of the previously described DARPin library have been fixed, are characterized. They show exceptionally high thermodynamic stabilities, even when compared to members of consensus DARPin libraries and even more so when compared to naturally occurring ankyrin repeat proteins. We determined the crystal structure of a full-consensus DARPin, containing an N-capping repeat, three identical internal repeats and a C-capping repeat at 2.05 A resolution, and compared its structure with that of the related DARPin library members E3_5 and E3_19. This structural comparison suggests that primarily salt bridges on the surface, which arrange in a network with almost crystal-like regularity, increase thermostability in the full-consensus NI(3)C DARPin to make it resistant to boiling. In the crystal structure, three sulfate ions complement this network.
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