Avidin is a homotetrameric ~56 kDa protein found in chicken egg white. Avidin's ability to bind biotin with a very high affinity has widely been exploited in biotechnological applications. Protein engineering has further diversified avidin's feasibility. ChiAVD(I117Y) is a product of rational protein engineering. It is a hyperthermostable synthetic hybrid of avidin and avidin-related protein 4 (AVR4). In this chimeric protein a 23-residue segment in avidin has been replaced with the corresponding sequence found in AVR4, and a point mutation at subunit interface 1-3 (and 2-4) has been introduced. Here we report the backbone and sidechain resonance assignments of the biotin-bound form of ChiAVD(I117Y) as well as the backbone resonance assignments of the free form.
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