Siah ubiquitin ligase is structurally related to traf and modulates tnf-α signaling. Polekhina, G., House, C., M., Traficante, N., Mackay, J., P., Relaix, F., Sassoon, D., A., Parker, M., W., & Bowtell, D., D. Nature Structural Biology, 9(1):68-75, 2002.
Siah ubiquitin ligase is structurally related to traf and modulates tnf-α signaling [link]Website  abstract   bibtex   
Members of the Siah (seven in absentia homolog) family of RING domain proteins are components of E3 ubiquitin ligase complexes that catalyze ubiquitination of proteins. We have determined the crystal structure of the substrate-binding domain (SBD) of murine Siah1a to 2.6 Å resolution. The structure reveals that Siah is a dimeric protein and that the SBD adopts an eight-stranded β-sandwich fold that is highly similar to the TRAF-C region of TRAF (TNF-receptor associated factor) proteins. The TRAF-C region interacts with TNF-α receptors and TNF-receptor associated death-domain (TRADD) proteins; however, our findings indicate that these interactions are unlikely to be mimicked by Siah. The Siah structure also reveals two novel zinc fingers in a region with sequence similarity to TRAF. We find that the Siah1a SBD potentiates TNF-α-mediated NF-κB activation. Therefore, Siah proteins share important similarities with the TRAF family of proteins, including their overall domain architecture, three-dimensional structure and functional activity. © 2002 Nature Publishing Group.
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 title = {Siah ubiquitin ligase is structurally related to traf and modulates tnf-α signaling},
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 year = {2002},
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 abstract = {Members of the Siah (seven in absentia homolog) family of RING domain proteins are components of E3 ubiquitin ligase complexes that catalyze ubiquitination of proteins. We have determined the crystal structure of the substrate-binding domain (SBD) of murine Siah1a to 2.6 Å resolution. The structure reveals that Siah is a dimeric protein and that the SBD adopts an eight-stranded β-sandwich fold that is highly similar to the TRAF-C region of TRAF (TNF-receptor associated factor) proteins. The TRAF-C region interacts with TNF-α receptors and TNF-receptor associated death-domain (TRADD) proteins; however, our findings indicate that these interactions are unlikely to be mimicked by Siah. The Siah structure also reveals two novel zinc fingers in a region with sequence similarity to TRAF. We find that the Siah1a SBD potentiates TNF-α-mediated NF-κB activation. Therefore, Siah proteins share important similarities with the TRAF family of proteins, including their overall domain architecture, three-dimensional structure and functional activity. © 2002 Nature Publishing Group.},
 bibtype = {article},
 author = {Polekhina, Galina and House, Colin M. and Traficante, Nadia and Mackay, Joel P. and Relaix, Frédéric and Sassoon, David A. and Parker, Michael W. and Bowtell, David D.L.},
 journal = {Nature Structural Biology},
 number = {1}
}

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