Members of this family are putative lantipeptide (most likely lantibiotic) precursors, about 53 amino acids long, found in a lantibiotic-type biosynthetic cluster in several species of Streptomyces (S. coelicolor, S. griseoflavus, S. ambofaciens, etc.). This family is described in AntiSMASH as Streptomyces PEQAXS motif lantipeptide precursor.
Jiyao W et al.(2023). "The conserved domain database in 2023.",