PRY is a 50-60 amino acids domain associated with SPRY domains, adjacent to its N-terminal. PRY and SPRY domains are structurally very similar and consist of a beta sandwich fold [1,2,3]. Distant homologues are domains in butyrophilin/marenostrin/pyrin, evolutionarily more ancient than SPRY/B30.2 counterpart.

1: The PYRIN connection: novel players in innate immunity and inflammation. Stehlik C, Reed JC; J Exp Med. 2004;200:551-558. PMID:15353551

2: Structure and function of the SPRY/B30.2 domain proteins involved in innate immunity. D'Cruz AA, Babon JJ, Norton RS, Nicola NA, Nicholson SE; Protein Sci. 2013;22:1-10. PMID:23139046

3: Structural basis for protein recognition by B30.2/SPRY domains. Woo JS, Suh HY, Park SY, Oh BH; Mol Cell. 2006;24:967-976. PMID:17189197