This is the C-terminal domain found in PGM1 present in Streptomyces cirratus. PGM1 is a gene product that links precursor peptides together to form the antibiotic Pheganomycin [1].

1: A peptide ligase and the ribosome cooperate to synthesize the peptide pheganomycin. Noike M, Matsui T, Ooya K, Sasaki I, Ohtaki S, Hamano Y, Maruyama C, Ishikawa J, Satoh Y, Ito H, Morita H, Dairi T; Nat Chem Biol. 2015;11:71-76. PMID:25402768