The SPRY domain of SSB-2 adopts a novel fold that presents conserved Par-4-binding residues
Masters, S.L., Yao, S., Willson, T.A., Zhang, J.G., Palmer, K.R., Smith, B.J., Babon, J.J., Nicola, N.A., Norton, R.S., Nicholson, S.E.(2006) Nat Struct Mol Biol 13: 77-84
- PubMed: 16369487
- DOI: https://doi.org/10.1038/nsmb1034
- Primary Citation of Related Structures:
2AFJ - PubMed Abstract:
The four mammalian SPRY domain-containing SOCS box proteins (SSB-1 to SSB-4) are characterized by a C-terminal SOCS box and a central SPRY domain. We have determined the first SPRY-domain structure, as part of SSB-2, by NMR. This domain adopts a novel fold consisting of a beta-sandwich structure formed by two four-stranded antiparallel beta-sheets with a unique topology. We demonstrate that SSB-1, SSB-2 and SSB-4, but not SSB-3, bind prostate apoptosis response protein-4 (Par-4). Mutational analysis of SSB-2 loop regions identified conserved structural determinants for its interaction with Par-4 and the hepatocyte growth factor receptor, c-Met. Mutations in analogous loop regions of pyrin and midline-1 SPRY domains have been shown to cause Mediterranean fever and Opitz syndrome, respectively. Our findings provide a template for SPRY-domain structure and an insight into the mechanism of SPRY-protein interaction.
Organizational Affiliation:
The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3050, Victoria, Australia.