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Protein domains containing three or more ankyrin repeats (ARs) are ubiquitous in all phyla. Sequence alignments previously identified certain conserved positions, which have been shown to stabilize AR domains and promote their folding. Consensus mutations [Y254L/T257A (YLTA) and C186P/A220P (CPAP)] stabilize the naturally occuring AR domain of human IκBα to denaturation; however, only the YLTA mutations...
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