1ygs: Difference between revisions

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[[Image:1ygs.jpg|left|200px]]
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[[Image:1ygs.png|left|200px]]


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{{STRUCTURE_1ygs|  PDB=1ygs  |  SCENE=  }}  
{{STRUCTURE_1ygs|  PDB=1ygs  |  SCENE=  }}  


'''CRYSTAL STRUCTURE OF THE SMAD4 TUMOR SUPPRESSOR C-TERMINAL DOMAIN'''
===CRYSTAL STRUCTURE OF THE SMAD4 TUMOR SUPPRESSOR C-TERMINAL DOMAIN===




==Overview==
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The Smad4/DPC4 tumour suppressor is inactivated in nearly half of pancreatic carcinomas and to a lesser extent in a variety of other cancers. Smad4/DPC4, and the related tumour suppressor Smad2, belong to the SMAD family of proteins that mediate signalling by the TGF-beta/activin/BMP-2/4 cytokine superfamily from receptor Ser/Thr protein kinases at the cell surface to the nucleus. SMAD proteins, which are phosphorylated by the activated receptor, propagate the signal, in part, through homo- and hetero-oligomeric interactions. Smad4/DPC4 plays a central role as it is the shared hetero-oligomerization partner of the other SMADs. The conserved carboxy-terminal domains of SMADs are sufficient for inducing most of the ligand-specific effects, and are the primary targets of tumorigenic inactivation. We now describe the crystal structure of the C-terminal domain (CTD) of the Smad4/DPC4 tumour suppressor, determined at 2.5 A resolution. The structure reveals that the Smad4/DPC4 CTD forms a crystallographic trimer through a conserved protein-protein interface, to which the majority of the tumour-derived missense mutations map. These mutations disrupt homo-oligomerization in vitro and in vivo, indicating that the trimeric assembly of the Smad4/DPC4 CTD is critical for signalling and is disrupted by tumorigenic mutations.
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{{ABSTRACT_PUBMED_9214508}}


==About this Structure==
==About this Structure==
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[[Category: Tgf-beta signal mediator]]
[[Category: Tgf-beta signal mediator]]
[[Category: Tumor suppressor c-terminal domain]]
[[Category: Tumor suppressor c-terminal domain]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 16:17:55 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 06:42:07 2008''

Revision as of 03:42, 29 July 2008

File:1ygs.png

Template:STRUCTURE 1ygs

CRYSTAL STRUCTURE OF THE SMAD4 TUMOR SUPPRESSOR C-TERMINAL DOMAIN

Template:ABSTRACT PUBMED 9214508

About this Structure

1YGS is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

A structural basis for mutational inactivation of the tumour suppressor Smad4., Shi Y, Hata A, Lo RS, Massague J, Pavletich NP, Nature. 1997 Jul 3;388(6637):87-93. PMID:9214508

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