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PHD finger found in CREB-binding protein (CBP) CBP, also termed as KAT3A, is an acetyltransferase acting on histone, which gives a specific tag for transcriptional activation and also acetylates non-histone proteins. CBP is also known as CREBBP, since it specifically interacts with the phosphorylated form of cyclic adenosine monophosphate-responsive element-binding protein (CREB). It augments the activity of phosphorylated CREB to activate transcription of cAMP-responsive genes. CBP contains a cysteine-histidine rich region, a KIX (CREB interaction) domain, a plant homeodomain (PHD) finger, a HAT domain, followed by a SRC interaction domain.
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