This domain is found in the Tail sheath protein gp29 from the giant Bacteriophage phiKZ. This entry represents a protease resistant fragment of this protein, gp29PR, which consists of a single domain showing a seven-stranded beta-sandwich with long insertions connecting adjacent beta-strands, including a long alpha-helix [1].

1: Structural conservation of the myoviridae phage tail sheath protein fold. Aksyuk AA, Kurochkina LP, Fokine A, Forouhar F, Mesyanzhinov VV, Tong L, Rossmann MG; Structure. 2011;19:1885-1894. PMID:22153511