| Structural highlights
Function
[P73_HUMAN] 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.[1] [2] [3]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
p73 and p63, the two ancestral members of the p53 family, are involved in neurogenesis, epithelial stem cell maintenance and quality control of female germ cells. The highly conserved oligomerization domain (OD) of tumor suppressor p53 is essential for its biological functions, and its structure was believed to be the prototype for all three proteins. However, we report that the ODs of p73 and p63 differ from the OD of p53 by containing an additional alpha-helix that is not present in the structure of the p53 OD. Deletion of this helix causes a dissociation of the OD into dimers; it also causes conformational instability and reduces the transcriptional activity of p73. Moreover, we show that ODs of p73 and p63 strongly interact and that a large number of different heterotetramers are supported by the additional helix. Detailed analysis shows that the heterotetramer consisting of two homodimers is thermodynamically more stable than the two homotetramers. No heterooligomerization between p53 and the p73/p63 subfamily was observed, supporting the notion of functional orthogonality within the p53 family.
Conformational stability and activity of p73 require a second helix in the tetramerization domain.,Coutandin D, Lohr F, Niesen FH, Ikeya T, Weber TA, Schafer B, Zielonka EM, Bullock AN, Yang A, Guntert P, Knapp S, McKeon F, Ou HD, Dotsch V Cell Death Differ. 2009 Dec;16(12):1582-9. Epub 2009 Sep 18. PMID:19763140[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Grob TJ, Novak U, Maisse C, Barcaroli D, Luthi AU, Pirnia F, Hugli B, Graber HU, De Laurenzi V, Fey MF, Melino G, Tobler A. Human delta Np73 regulates a dominant negative feedback loop for TAp73 and p53. Cell Death Differ. 2001 Dec;8(12):1213-23. PMID:11753569 doi:10.1038/sj.cdd.4400962
- ↑ Kaelin WG Jr. The emerging p53 gene family. J Natl Cancer Inst. 1999 Apr 7;91(7):594-8. PMID:10203277
- ↑ Koida N, Ozaki T, Yamamoto H, Ono S, Koda T, Ando K, Okoshi R, Kamijo T, Omura K, Nakagawara A. Inhibitory role of Plk1 in the regulation of p73-dependent apoptosis through physical interaction and phosphorylation. J Biol Chem. 2008 Mar 28;283(13):8555-63. doi: 10.1074/jbc.M710608200. Epub 2008 , Jan 3. PMID:18174154 doi:10.1074/jbc.M710608200
- ↑ Coutandin D, Lohr F, Niesen FH, Ikeya T, Weber TA, Schafer B, Zielonka EM, Bullock AN, Yang A, Guntert P, Knapp S, McKeon F, Ou HD, Dotsch V. Conformational stability and activity of p73 require a second helix in the tetramerization domain. Cell Death Differ. 2009 Dec;16(12):1582-9. Epub 2009 Sep 18. PMID:19763140 doi:10.1038/cdd.2009.139
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