CAMP responsive element binding protein 1, also known as CREB-1, is a protein that in humans is encoded by the CREB1 gene. [5] [6] This protein binds the cAMP response element, a DNA nucleotide sequence present in many viral and cellular promoters. The binding of CREB1 stimulates transcription.
This protein is a CREB transcription factor that is a member of the leucine zipper family of DNA-binding proteins. This protein binds as a homodimer to the cAMP-responsive element, an octameric palindrome. The protein is phosphorylated by several protein kinases, and induces transcription of genes in response to hormonal stimulation of the cAMP pathway. Alternate splicing of this gene results in two transcript variants encoding different isoforms. [7]
CREB1 has been shown to interact with:
CREB-TF is a cellular transcription factor. It binds to certain DNA sequences called cAMP response elements (CRE), thereby increasing or decreasing the transcription of the genes. CREB was first described in 1987 as a cAMP-responsive transcription factor regulating the somatostatin gene.
CREB-binding protein, also known as CREBBP or CBP, is a protein that in humans is encoded by the CREBBP gene. The CREB protein carries out its function by activating transcription, where interaction with transcription factors is managed by one or more CREB domains: the nuclear receptor interaction domain (RID), the KIX domain, the cysteine/histidine regions and the interferon response binding domain (IBiD). The CREB protein domains, KIX, TAZ1 and TAZ2, each bind tightly to a sequence spanning both transactivation domains 9aaTADs of transcription factor p53.
The nuclear receptor coactivator 1 (NCOA1) is a transcriptional coregulatory protein that contains several nuclear receptor interacting domains and an intrinsic histone acetyltransferase activity. NCOA1 is recruited to DNA promotion sites by ligand-activated nuclear receptors. NCOA1, in turn, acylates histones, which makes downstream DNA more accessible to transcription. Hence, NCOA1 assists nuclear receptors in the upregulation of DNA expression.
Transcription factor p65 also known as nuclear factor NF-kappa-B p65 subunit is a protein that in humans is encoded by the RELA gene.
Myocyte-specific enhancer factor 2C also known as MADS box transcription enhancer factor 2, polypeptide C is a protein that in humans is encoded by the MEF2C gene. MEF2C is a transcription factor in the Mef2 family.
Cyclic AMP-dependent transcription factor ATF-1 is a protein that in humans is encoded by the ATF1 gene.
Activating transcription factor 4 , also known as ATF4, is a protein that in humans is encoded by the ATF4 gene.
GA-binding protein alpha chain is a protein that in humans is encoded by the GABPA gene.
Ribosomal protein S6 kinase alpha-1 is an enzyme that in humans is encoded by the RPS6KA1 gene.
Activating transcription factor 2, also known as ATF2, is a protein that, in humans, is encoded by the ATF2 gene.
cAMP responsive element modulator is a protein that in humans is encoded by the CREM gene, and it belongs to the cAMP-responsive element binding protein family. It has multiple isoforms, which act either as repressors or activators. CREB family is important for in regulating transcription in response to various stresses, metabolic and developmental signals. CREM transcription factors also play an important role in many physiological systems, such as cardiac function, circadian rhythms, locomotion and spermatogenesis.
General transcription factor II-I is a protein that in humans is encoded by the GTF2I gene.
Cell division protein kinase 8 is an enzyme that in humans is encoded by the CDK8 gene.
CREB-regulated transcription coactivator 1 (CRTC1), previously referred to as TORC1, is a protein that in humans is encoded by the CRTC1 gene. It is expressed in a limited number of tissues that include fetal brain and liver and adult heart, skeletal muscles, liver and salivary glands and various regions of the adult central nervous system.
RISC-loading complex subunit TARBP2 is a protein that in humans is encoded by the TARBP2 gene.
Cyclic AMP-responsive element-binding protein 3 is a protein that in humans is encoded by the CREB3 gene.
CAMP responsive element binding protein-like 1, also known as CREBL1, is a protein which in humans is encoded by the CREBL1 gene.
CREB regulated transcription coactivator 2, also known as CRTC2, is a protein which in humans is encoded by the CRTC2 gene.
Transcription factor MafK is a bZip Maf transcription factor protein that in humans is encoded by the MAFK gene.
The transactivation domain or trans-activating domain (TAD) is a transcription factor scaffold domain which contains binding sites for other proteins such as transcription coregulators. These binding sites are frequently referred to as activation functions (AFs). TADs are named after their amino acid composition. These amino acids are either essential for the activity or simply the most abundant in the TAD. Transactivation by the Gal4 transcription factor is mediated by acidic amino acids, whereas hydrophobic residues in Gcn4 play a similar role. Hence, the TADs in Gal4 and Gcn4 are referred to as acidic or hydrophobic, respectively.
This article incorporates text from the United States National Library of Medicine, which is in the public domain.