EP300

1L3E, 1P4Q, 2K8F, 2MH0, 2MZD, 3BIY, 3I3J, 3IO2, 3P57, 3T92, 4BHW, 4PZR, 4PZS, 4PZT, 5BT32033328572ENSG00000100393ENSMUSG00000055024Q09472B2RWS6NM_001429NM_001362843NM_177821NP_001420NP_001349772NP_808489Histone acetyltransferase p300 also known as p300 HAT or E1A-associated protein p300 (where E1A = adenovirus early region 1A) also known as EP300 or p300 is an enzyme that, in humans, is encoded by the EP300 gene. It functions as histone acetyltransferase that regulates transcription of genes via chromatin remodeling. This enzyme plays an essential role in regulating cell growth and division, prompting cells to mature and assume specialized functions (differentiate), and preventing the growth of cancerous tumors. The p300 protein appears to be critical for normal development before and after birth.1f81: SOLUTION STRUCTURE OF THE TAZ2 DOMAIN OF THE TRANSCRIPTIONAL ADAPTOR PROTEIN CBP1jsp: NMR Structure of CBP Bromodomain in complex with p53 peptide1kdx: KIX DOMAIN OF MOUSE CBP (CREB BINDING PROTEIN) IN COMPLEX WITH PHOSPHORYLATED KINASE INDUCIBLE DOMAIN (PKID) OF RAT CREB (CYCLIC AMP RESPONSE ELEMENT BINDING PROTEIN), NMR 17 STRUCTURES1l3e: NMR Structures of the HIF-1alpha CTAD/p300 CH1 Complex1l8c: STRUCTURAL BASIS FOR HIF-1ALPHA/CBP RECOGNITION IN THE CELLULAR HYPOXIC RESPONSE1p4q: Solution structure of the CITED2 transactivation domain in complex with the p300 CH1 domain1r8u: NMR structure of CBP TAZ1/CITED2 complex1u2n: Structure CBP TAZ1 Domain2d82: Target Structure-Based Discovery of Small Molecules that Block Human p53 and CREB Binding Protein (CBP) Association Histone acetyltransferase p300 also known as p300 HAT or E1A-associated protein p300 (where E1A = adenovirus early region 1A) also known as EP300 or p300 is an enzyme that, in humans, is encoded by the EP300 gene. It functions as histone acetyltransferase that regulates transcription of genes via chromatin remodeling. This enzyme plays an essential role in regulating cell growth and division, prompting cells to mature and assume specialized functions (differentiate), and preventing the growth of cancerous tumors. The p300 protein appears to be critical for normal development before and after birth. The EP300 gene is located on the long (q) arm of the human chromosome 22 at position 13.2. This gene encodes the adenovirus E1A-associated cellular p300 transcriptional co-activator protein. EP300 is closely related to another gene, CREB binding protein, which is found on human chromosome 16. p300 HAT functions as histone acetyltransferase that regulates transcription via chromatin remodeling, and is important in the processes of cell proliferation and differentiation. It mediates cAMP-gene regulation by binding specifically to phosphorylated CREB protein. p300 HAT contains a bromodomain which is involved in IL6 signaling.:3.1 This gene has also been identified as a co-activator of HIF1A (hypoxia-inducible factor 1 alpha), and, thus, plays a role in the stimulation of hypoxia-induced genes such as VEGF. The p300 protein carries out its function of activating transcription by binding to transcription factors, and the transcription machinery. On the basis of this function, p300 is called a transcriptional coactivator. The p300 interaction with transcription factors is managed by one or more of p300 domains: the nuclear receptor interaction domain (RID), the KIX domain (CREB and MYB interaction domain), the cysteine/histidine regions (TAZ1/CH1 and TAZ2/CH3) and the interferon response binding domain (IBiD). The last four domains, KIX, TAZ1, TAZ2 and IBiD of p300, each bind tightly to a sequence spanning both transactivation domains 9aaTADs of transcription factor p53. Mutations in the EP300 gene are responsible for a small percentage of cases of Rubinstein-Taybi syndrome. These mutations result in the loss of one copy of the gene in each cell, which reduces the amount of p300 protein by half. Some mutations lead to the production of a very short, nonfunctional version of the p300 protein, while others prevent one copy of the gene from making any protein at all. Although researchers do not know how a reduction in the amount of p300 protein leads to the specific features of Rubinstein-Taybi syndrome, it is clear that the loss of one copy of the EP300 gene disrupts normal development. Chromosomal rearrangements involving chromosome 22 have rarely been associated with certain types of cancer. These rearrangements, called translocations, disrupt the region of chromosome 22 that contains the EP300 gene. For example, researchers have found a translocation between chromosomes 8 and 22 in several people with a cancer of blood cells called acute myeloid leukemia (AML). Another translocation, involving chromosomes 11 and 22, has been found in a small number of people who have undergone cancer treatment. This chromosomal change is associated with the development of AML following chemotherapy for other forms of cancer.