2poi
From Proteopedia
| Line 1: | Line 1: | ||
[[Image:2poi.jpg|left|200px]] | [[Image:2poi.jpg|left|200px]] | ||
| - | + | <!-- | |
| - | + | The line below this paragraph, containing "STRUCTURE_2poi", creates the "Structure Box" on the page. | |
| - | + | You may change the PDB parameter (which sets the PDB file loaded into the applet) | |
| - | + | or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |
| - | + | or leave the SCENE parameter empty for the default display. | |
| - | + | --> | |
| - | + | {{STRUCTURE_2poi| PDB=2poi | SCENE= }} | |
| - | | | + | |
| - | | | + | |
| - | }} | + | |
'''Crystal structure of XIAP BIR1 domain (I222 form)''' | '''Crystal structure of XIAP BIR1 domain (I222 form)''' | ||
| Line 26: | Line 23: | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Lin, S.]] | [[Category: Lin, S.]] | ||
| - | [[Category: | + | [[Category: Zinc finger]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 13:32:25 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 10:32, 4 May 2008
Crystal structure of XIAP BIR1 domain (I222 form)
Overview
In addition to caspase inhibition, X-linked inhibitor of apoptosis (XIAP) induces NF-kappaB and MAP kinase activation during TGF-b and BMP receptor signaling and upon overexpression. Here we show that the BIR1 domain of XIAP, which has no previously ascribed function, directly interacts with TAB1 to induce NF-kappaB activation. TAB1 is an upstream adaptor for the activation of the kinase TAK1, which in turn couples to the NF-kappaB pathway. We report the crystal structures of BIR1, TAB1, and the BIR1/TAB1 complex. The BIR1/TAB1 structure reveals a striking butterfly-shaped dimer and the detailed interaction between BIR1 and TAB1. Structure-based mutagenesis and knockdown of TAB1 show unambiguously that the BIR1/TAB1 interaction is crucial for XIAP-induced TAK1 and NF-kappaB activation. We show that although not interacting with BIR1, Smac, the antagonist for caspase inhibition by XIAP, also inhibits the XIAP/TAB1 interaction. Disruption of BIR1 dimerization abolishes XIAP-mediated NF-kappaB activation, implicating a proximity-induced mechanism for TAK1 activation.
About this Structure
2POI is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
XIAP induces NF-kappaB activation via the BIR1/TAB1 interaction and BIR1 dimerization., Lu M, Lin SC, Huang Y, Kang YJ, Rich R, Lo YC, Myszka D, Han J, Wu H, Mol Cell. 2007 Jun 8;26(5):689-702. PMID:17560374 Page seeded by OCA on Sun May 4 13:32:25 2008
