title: The SPRY domain of SSB-2 adopts a novel fold that presents conserved Par-4-binding residues.
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.
authors.affiliation: The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, 3050, Victoria, Australia.
authors.forename: Seth L
authors.initials: SL
authors.lastname: Masters
authors.forename: Shenggen
authors.initials: S
authors.lastname: Yao
authors.forename: Tracy A
authors.initials: TA
authors.lastname: Willson
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Zhang
authors.forename: Kirsten R
authors.initials: KR
authors.lastname: Palmer
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Smith
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Babon
authors.forename: Nicos A
authors.initials: NA
authors.lastname: Nicola
authors.forename: Raymond S
authors.initials: RS
authors.lastname: Norton
authors.forename: Sandra E
authors.initials: SE
authors.lastname: Nicholson
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D051017:Apoptosis Regulatory Proteins / Q000378:metabolism*; D002460:Cell Line; D017124:Conserved Sequence; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D004194:Disease; D006801:Humans; D008297:Male; D051379:Mice; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics; D019906:Nuclear Magnetic Resonance, Biomolecular; D010802:Phylogeny; D011485:Protein Binding; D017510:Protein Folding; D017434:Protein Structure, Tertiary; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D040681:Structural Homology, Protein
chemical_list: D051017:Apoptosis Regulatory Proteins; D004268:DNA-Binding Proteins; C508499:SSB-2 protein, mouse; C101296:prostate apoptosis response-4 protein