The High Mobility Group protein HMG I(Y) is required for NF-κB-dependent virus induction of the human IFN-β gene

Abstract In this paper, we show that both NF-κB and the high mobility group protein I(Y) (HMG I(Y)) are required for virus induction of the human interferon-β (IFN-β) gene. NF-κB binds to the terminal regions of a 10 by regulatory sequence through contacts in the major groove, while HMG I(Y) recognizes the central region of the same sequence through contacts in the minor groove. Mutations that interfere with binding of either protein decrease the level of virus induction, and activation of the gene can be blocked by either NF-κB or HMG I(Y) antisense RNA. HMG I(Y) stimulates the binding of NF-κB to the IFN-β promoter, and it may also function as a promoter-specific accessory factor for NF-κB transcriptional activity.

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