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The factor inhibiting HIF-1 (FIH-1) hydroxylates many ankyrin repeat-containing proteins including IκBα. It is widely speculated that hydroxylation of IκBα has functional consequences, but the effects of hydroxylation have not been demonstrated. We prepared hydroxylated IκBα and compared it to the unhydroxylated protein. Urea denaturation and amide H/D exchange experiments showed no change in the...
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