2h1l
From Proteopedia
(New page: 200px<br /> <applet load="2h1l" size="450" color="white" frame="true" align="right" spinBox="true" caption="2h1l, resolution 3.16Å" /> '''The Structure of th...) |
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| - | [[Image:2h1l.gif|left|200px]]<br /> | + | [[Image:2h1l.gif|left|200px]]<br /><applet load="2h1l" size="350" color="white" frame="true" align="right" spinBox="true" |
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caption="2h1l, resolution 3.16Å" /> | caption="2h1l, resolution 3.16Å" /> | ||
'''The Structure of the Oncoprotein SV40 Large T Antigen and p53 Tumor Suppressor Complex'''<br /> | '''The Structure of the Oncoprotein SV40 Large T Antigen and p53 Tumor Suppressor Complex'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The transformation potential of Simian Virus 40 depends on the activities | + | The transformation potential of Simian Virus 40 depends on the activities of large T-antigen (LTag), which interacts with several cellular tumor suppressors including the important "guardian" of the genome, p53. Inhibition of p53 function by LTag is necessary for both efficient viral replication and cellular transformation. We determined the crystal structure of LTag in complex with p53. The structure reveals an unexpected hexameric complex of LTag binding six p53 monomers. Structure-guided mutagenesis of LTag and p53 residues supported the p53-LTag interface defined by the complex structure. The structure also shows that LTag binding induces dramatic conformational changes at the DNA-binding area of p53, which is achieved partially through an unusual "methionine switch" within p53. In the complex structure, LTag occupies the whole p53 DNA-binding surface and likely interferes with formation of a functional p53 tetramer. In addition, we showed that p53 inhibited LTag helicase function through direct complex formation. |
==Disease== | ==Disease== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2H1L is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Simian_virus_40 Simian virus 40] with ZN as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 2H1L is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Simian_virus_40 Simian virus 40] with <scene name='pdbligand=ZN:'>ZN</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2H1L OCA]. |
==Reference== | ==Reference== | ||
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[[Category: p53 loop-3 conformation change]] | [[Category: p53 loop-3 conformation change]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:37:16 2008'' |
Revision as of 15:37, 21 February 2008
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The Structure of the Oncoprotein SV40 Large T Antigen and p53 Tumor Suppressor Complex
Contents |
Overview
The transformation potential of Simian Virus 40 depends on the activities of large T-antigen (LTag), which interacts with several cellular tumor suppressors including the important "guardian" of the genome, p53. Inhibition of p53 function by LTag is necessary for both efficient viral replication and cellular transformation. We determined the crystal structure of LTag in complex with p53. The structure reveals an unexpected hexameric complex of LTag binding six p53 monomers. Structure-guided mutagenesis of LTag and p53 residues supported the p53-LTag interface defined by the complex structure. The structure also shows that LTag binding induces dramatic conformational changes at the DNA-binding area of p53, which is achieved partially through an unusual "methionine switch" within p53. In the complex structure, LTag occupies the whole p53 DNA-binding surface and likely interferes with formation of a functional p53 tetramer. In addition, we showed that p53 inhibited LTag helicase function through direct complex formation.
Disease
Known diseases associated with this structure: Adrenal cortical carcinoma OMIM:[191170], Breast cancer OMIM:[191170], Colorectal cancer OMIM:[191170], Hepatocellular carcinoma OMIM:[191170], Histiocytoma OMIM:[191170], Li-Fraumeni syndrome OMIM:[191170], Multiple malignancy syndrome OMIM:[191170], Nasopharyngeal carcinoma OMIM:[191170], Osteosarcoma OMIM:[191170], Pancreatic cancer OMIM:[191170], Thyroid carcinoma OMIM:[191170]
About this Structure
2H1L is a Protein complex structure of sequences from Homo sapiens and Simian virus 40 with as ligand. Full crystallographic information is available from OCA.
Reference
Crystal structure of SV40 large T-antigen bound to p53: interplay between a viral oncoprotein and a cellular tumor suppressor., Lilyestrom W, Klein MG, Zhang R, Joachimiak A, Chen XS, Genes Dev. 2006 Sep 1;20(17):2373-82. PMID:16951253
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