View source for 8uqt


==Crystal structure of the Tree Shrew p53 tetramerization domain==
<StructureSection load='8uqt' size='340' side='right'caption='[[8uqt]], [[Resolution|resolution]] 1.16&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8uqt]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Tupaia_chinensis Tupaia chinensis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8UQT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8UQT FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.16&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=8uqt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8uqt OCA], [https://pdbe.org/8uqt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8uqt RCSB], [https://www.ebi.ac.uk/pdbsum/8uqt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8uqt ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/W8FSP6_TUPCH W8FSP6_TUPCH] Acts as a tumor suppressor in many tumor types; induces growth arrest or apoptosis depending on the physiological circumstances and cell type. Involved in cell cycle regulation as a trans-activator that acts to negatively regulate cell division by controlling a set of genes required for this process. One of the activated genes is an inhibitor of cyclin-dependent kinases. Apoptosis induction seems to be mediated either by stimulation of BAX and FAS antigen expression, or by repression of Bcl-2 expression.[RuleBase:RU003304]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The p53 protein is a transcriptional regulatory factor and many of its functions require that it forms a tetrameric structure. Although the tetramerization domain of mammalian p53 proteins (p53TD) share significant sequence similarities, it was recently shown that the tree shrew p53TD is considerably more thermostable than the human p53TD. To determine whether other mammalian species display differences in this domain, we used biophysical, functional, and structural studies to compare the properties of the p53TDs from six mammalian model organisms (human, tree shrew, guinea pig, Chinese hamster, sheep, and opossum). The results indicate that the p53TD from the opossum and tree shrew are significantly more stable than the human p53TD, and there is a correlation between the thermostability of the p53TDs and their ability to activate transcription. Structural analysis of the tree shrew and opossum p53TDs indicated that amino acid substitutions within two distinct regions of their p53TDs can dramatically alter hydrophobic packing of the tetramer, and in particular substitutions at positions corresponding to F341 and Q354 of the human p53TD. Together, the results suggest that subtle changes in the sequence of the p53TD can dramatically alter the stability, and potentially lead to important changes in the functional activity, of the p53 protein.

Highly Similar Tetramerization Domains from the p53 Protein of Different Mammalian Species Possess Varying Biophysical, Functional and Structural Properties.,Sakaguchi S, Nakagawa N, Wahba HM, Wada J, Kamada R, Omichinski JG, Sakaguchi K Int J Mol Sci. 2023 Nov 22;24(23):16620. doi: 10.3390/ijms242316620. PMID:38068946<ref>PMID:38068946</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8uqt" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Tupaia chinensis]]
[[Category: Kamada R]]
[[Category: Nakagawa N]]
[[Category: Omichinski JG]]
[[Category: Sakaguchi K]]
[[Category: Sakaguchi S]]
[[Category: Wada J]]
[[Category: Wahba HM]]