TP73

Domain

Possesses an acidic transactivation domain, a central DNA binding domain and a C-terminal oligomerization domain that binds to the ABL1 tyrosine kinase SH3 domain.

The PPxY 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.

Post-translational modifications

Isoform alpha (but not isoform beta) is sumoylated on Lys-627, which potentiates proteasomal degradation but does not affect transcriptional activity. Phosphorylation by PLK1 and PLK3 inhibits the transcription regulator activity and pro-apoptotic function.

Higher levels of phosphorylation seen in the brain from patients with Huntington disease.

Polyubiquitinated by RCHY1/PIRH2; leading to its degradation by the proteasome.

Sequence similarities

Belongs to the p53 family.

Tissue specificity

Expressed in striatal neurons of patients with Huntington disease (at protein level). Brain, kidney, placenta, colon, heart, liver, spleen, skeletal muscle, prostate, thymus and pancreas. Highly expressed in fetal tissue.

Cellular localization

• Nucleus
• Cytoplasm
• Accumulates in the nucleus in response to DNA damage.

Alternative names

• Tumor protein p73
• p53-like transcription factor
• p53-related protein
• TP73
• P73

Database links

• entrezGene:7161
• omim:601990
• swissprot:O15350

Target type

Proteins

Molecular weight

54322Da