This domain is Copsin present in Coprinopsis cinerea. Copsin is a defensin that interferes with peptidoglycan synthesis and has a CS-alpha-beta fold. Copsin is stabilized by a unique connectivity of six cysteine bonds in contrast to most other CS-alpha-beta defensins which are linked by three or four disulfide bonds [1].

1: Copsin, a novel peptide-based fungal antibiotic interfering with the peptidoglycan synthesis. Essig A, Hofmann D, Munch D, Gayathri S, Kunzler M, Kallio PT, Sahl HG, Wider G, Schneider T, Aebi M; J Biol Chem. 2014;289:34953-34964. PMID:25342741