cofactor:Binds 1 zinc ion per subunit. ,Disease:Maps to a chromosome region frequently mutated in diverse cell lines of human cancer. Appears not to be frequently mutated in human cancers , in contrast to p53. Hemizygosity is observed in neuroblastoma and oligodendroglioma. ,Domain:Possesses an acidic transactivation domain , a central DNA binding domain and a C-terminal oligomerization domain that binds to the ABL tyrosine kinase SH3 domain. ,Domain:The WW-binding motif mediates interaction with WWOX. ,Function:Participates in the apoptotic response to DNA damage. Isoforms containing the transactivation domain are pro-apoptotic , isoforms lacking the domain are anti-apoptotic and block the function of p53 and transactivating p73 isoforms. May be a tumor suppressor protein. ,induction:Not induced by DNA damage. Isoforms lacking the transactivation domain block gene induction. ,miscellaneous:Activated and stabilized by interaction with RANBP9. ,PTM:Isoform alpha (but not isoform beta) is sumoylated on Lys-627 , which potentiates proteasomal degradation but does not affect transcriptional activity. ,similarity:Belongs to the p53 family. ,similarity:Contains 1 SAM (sterile alpha motif) domain. ,subcellular location:Accumulates in the nucleus in response to DNA damage. ,subunit:Found in a complex with p53/TP53 and CABLES1. The C-terminal oligomerization domain binds to the ABL tyrosine kinase SH3 domain. Interacts with HECW2. Isoform Beta interacts homotypically and with p53/TP53 , whereas isoform Alpha does not. Isoform Gamma interacts homotypically and with all p73 isoforms. Isoform Delta interacts with isoform Gamma , isoform Alpha , and homotypically. Isoforms Alpha and Beta interact with HIPK2. Isoform Alpha interacts with RANBP9. Isoform Beta interacts with WWOX. ,tissue specificity:Brain , kidney , placenta , colon , heart , liver , spleen , skeletal muscle , prostate , thymus and pancreas. Highly expressed in fetal tissue. ,
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