3bes
From Proteopedia
Structure of a Poxvirus ifngbp/ifng Complex
Contents |
Overview
Ectromelia virus (ECTV) encodes an IFN-gamma-binding protein (IFN-gammaBP(ECTV)) that disrupts IFN-gamma signaling and its ability to induce an antiviral state within cells. IFN-gammaBP(ECTV) is an important virulence factor that is highly conserved (>90%) in all orthopoxviruses, including variola virus, the causative agent of smallpox. The 2.2-A crystal structure of the IFN-gammaBP(ECTV)/IFN-gamma complex reveals IFN-gammaBP(ECTV) consists of an IFN-gammaR1 ligand-binding domain and a 57-aa helix-turn-helix (HTH) motif that is structurally related to the transcription factor TFIIA. The HTH motif forms a tetramerization domain that results in an IFN-gammaBP(ECTV)/IFN-gamma complex containing four IFN-gammaBP(ECTV) chains and two IFN-gamma dimers. The structure, combined with biochemical and cell-based assays, demonstrates that IFN-gammaBP(ECTV) tetramers are required for efficient IFN-gamma antagonism.
Disease
Known disease associated with this structure: AIDS, rapid progression to OMIM:[147570], Aplastic anemia OMIM:[147570], Interferon, immune, deficiency OMIM:[147570], Hepatitis C virus, resistance to OMIM:[147570], TSC2 angiomyolipomas, renal, modifier of OMIM:[147570], Tuberculosis, susceptibility to OMIM:[147570]
About this Structure
3BES is a Protein complex structure of sequences from Ectromelia virus and Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structure and mechanism of IFN-gamma antagonism by an orthopoxvirus IFN-gamma-binding protein., Nuara AA, Walter LJ, Logsdon NJ, Yoon SI, Jones BC, Schriewer JM, Buller RM, Walter MR, Proc Natl Acad Sci U S A. 2008 Feb 12;105(6):1861-6. Epub 2008 Feb 5. PMID:18252829 Page seeded by OCA on Sun May 4 20:41:44 2008
