Function: Phosphorylation-dependent transcription factor that stimulates transcription upon binding to the DNA cAMP response element (CRE), a sequence present in many viral and cellular promoters. Transcription activation is enhanced by the TORC coactivators which act independently of Ser-117 phosphorylation. Involved in different cellular processes including the synchronization of circadian rhythmicity and the differentiation of adipose cells
By similarity.
Subunit structure: Interacts with PPRC1. Binds DNA as a dimer. Interacts, through the bZIP domain, with the coactivators TORC1/CRTC1, TORC2/CRTC2 and TORC3/CRTC3
By similarity. When phosphorylated on Ser-133, binds CREBBP. Interacts with ARRB1. Interacts (phosphorylated form) with TOX3. Binds to HIPK2
By similarity. Interacts with SGK1
By similarity. Interacts with CREBL2; regulates CREB1 phosphorylation, stability and transcriptional activity
By similarity.
Subcellular location: Nucleus.
Post-translational modification: Phosphorylation of Ser-133 allows CREBBP binding. Stimulated by phosphorylation. Phosphorylation of both Ser-142 and Ser-133 in the SCN regulates the activity of CREB and participate in circadian rhythm generation
By similarity. Phosphorylated upon calcium influx by CaMK4 and CaMK2 on Ser-133. CaMK4 is much more potent than CaMK2 in activating CREB. Phosphorylated by CaMK2 on Ser-142. Phosphorylation of Ser-142 blocks CREB-mediated transcription even when Ser-133 is phosphorylated. Phosphorylated by CaMK1. Phosphorylation of Ser-271 by HIPK2 in response to genotoxic stress promotes CREB1 activity, facilitating the recruitment of the coactivator CBP. Phosphorylated at Ser-133 by RPS6KA3, RPS6KA4 and RPS6KA5 in response to mitogenic or stress stimuli
By similarity. CREBL2 positively regulates phosphorylation at Ser-133 thereby stimulating CREB1 transcriptional activity
By similarity. Ref.3 Ref.4 Ref.5Sumoylated with SUMO1. Sumoylation on Lys-304, but not on Lys-285, is required for nuclear localization of this protein. Sumoylation is enhanced under hypoxia, promoting nuclear localization and stabilization
By similarity.
Sequence similarities: Belongs to the bZIP family.Contains 1 bZIP (basic-leucine zipper) domain.Contains 1 KID (kinase-inducible) domain.
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