Acts as a sequence specific DNA binding transcriptional activator or repressor. The isoforms contain a varying set of transactivation and auto-regulating transactivation inhibiting domains thus showing an isoform specific activity. Isoform 2 activates RIPK4 transcription. May be required in conjunction with TP73/p73 for initiation of p53/TP53 dependent apoptosis in response to genotoxic insults and the presence of activated oncogenes. Involved in Notch signaling by probably inducing JAG1 and JAG2. Plays a role in the regulation of epithelial morphogenesis. The ratio of DeltaN-type and TA*-type isoforms may govern the maintenance of epithelial stem cell compartments and regulate the initiation of epithelial stratification from the undifferentiated embryonal ectoderm. Required for limb formation from the apical ectodermal ridge. Activates transcription of the p21 promoter. Binds DNA as a homotetramer. Isoform composition of the tetramer may determine transactivation activity. Isoforms Alpha and Gamma interact with HIPK2. Interacts with SSRP1, leading to stimulate coactivator activity. Isoform 1 and isoform 2 interact with WWP1. Interacts with PDS5A. Isoform 5 (via activation domain) interacts with NOC2L. Widely expressed, notably in heart, kidney, placenta, prostate, skeletal muscle, testis and thymus, although the precise isoform varies according to tissue type. Progenitor cell layers of skin, breast, eye and prostate express high levels of DeltaN-type isoforms. Isoform 10 is predominantly expressed in skin squamous cell carcinomas, but not in normal skin tissues. Belongs to the p53 family. 12 isoforms of the human protein are produced by alternative promoter. Note: This description may include information from UniProtKB.
Protein type: Transcription factor; DNA binding protein
Molecular Function: identical protein binding; protein binding; DNA binding; p53 binding; sequence-specific DNA binding; metal ion binding; double-stranded DNA binding; damaged DNA binding; chromatin binding; transcription factor activity
Biological Process: G1 DNA damage checkpoint; ectoderm and mesoderm interaction; apoptosis; positive regulation of transcription, DNA-dependent; cloacal septation; epidermal cell division; negative regulation of transcription from RNA polymerase II promoter; protein homotetramerization; polarized epithelial cell differentiation; smooth muscle development; DNA damage response, signal transduction by p53 class mediator resulting in transcription of p21 class mediator; sympathetic nervous system development; regulation of neuron apoptosis; positive regulation of mesenchymal cell proliferation; response to gamma radiation; epithelial cell development; establishment of planar polarity; female genitalia morphogenesis; skeletal development; DNA damage response, signal transduction by p53 class mediator resulting in induction of apoptosis; proximal/distal pattern formation; positive regulation of Notch signaling pathway; embryonic limb morphogenesis; response to X-ray; Notch signaling pathway; hair follicle morphogenesis; urinary bladder development; negative regulation of keratinocyte differentiation; multicellular organismal aging; cell aging; keratinocyte proliferation; odontogenesis of dentine-containing teeth; chromatin remodeling; keratinocyte differentiation; positive regulation of osteoblast differentiation; neuron apoptosis; positive regulation of transcription from RNA polymerase II promoter; negative regulation of transcription, DNA-dependent; negative regulation of apoptosis
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.