2ioi | pdb_00002ioi
Crystal structure of the mouse p53 core domain at 1.55 A
Structural highlights
Disease[P53_MOUSE] Note=p53 is found in increased amounts in a wide variety of transformed cells. p53 is frequently mutated or inactivated in many types of cancer. Function[P53_MOUSE] 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. In cooperation with mitochondrial PPIF is involved in activating oxidative stress-induced necrosis; te function is largely independent of transcription. Prevents CDK7 kinase activity when associated to CAK complex in response to DNA damage, thus stopping cell cycle progression (By similarity). Induces the transcription of long intergenic non-coding RNA p21 (lincRNA-p21) and lincRNA-Mkln1. LincRNA-p21 participates in TP53-dependent transcriptional repression leading to apoptosis, but seems to have to effect on cell-cycle regulation.[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 PubMedThe p53 transcriptional regulator is the most frequently mutated protein in human cancers and the majority of tumor-derived p53 mutations map to the central DNA-binding core domain, with a subset of these mutations resulting in reduced p53 stability. Here, the 1.55 A crystal structure of the mouse p53 core domain with a molecule of tris(hydroxymethyl)aminomethane (Tris) bound through multiple hydrogen bonds to a region of p53 shown to be important for repair of a subset of tumor-derived p53-stability mutations is reported. Consistent with the hypothesis that Tris binding stabilizes the p53 core domain, equilibrium denaturation experiments are presented that demonstrate that Tris binding increases the thermodynamic stability of the mouse p53 core domain by 3.1 kJ mol(-1) and molecular-dynamic simulations are presented revealing an overall reduction in root-mean-square deviations of the core domain of 0.7 A when Tris is bound. It is also shown that these crystals of the p53 core domain are suitable for the multiple-solvent crystal structure approach to identify other potential binding sites for possible core-domain stabilization compounds. Analysis of the residue-specific temperature factors of the high-resolution core-domain structure, coupled with a comparison with other core-domain structures, also reveals that the L1, H1-S5 and S7-S8 core-domain loops, also shown to mediate various p53 activities, harbor inherent flexibility, suggesting that these regions might be targets for other p53-stabilizing compounds. Together, these studies provide a molecular scaffold for the structure-based design of p53-stabilization compounds for development as possible therapeutic agents. High-resolution structure of the p53 core domain: implications for binding small-molecule stabilizing compounds.,Ho WC, Luo C, Zhao K, Chai X, Fitzgerald MX, Marmorstein R Acta Crystallogr D Biol Crystallogr. 2006 Dec;62(Pt 12):1484-93. Epub 2006, Nov 23. PMID:17139084[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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