This family consists of several Salmonella PipA (pathogenicity island-encoded protein A) and related phage sequences. PipA is thought to contribute to enteric but not to systemic salmonellosis. The family carries a highly conserved HEXXH sequence motif along with several highly conserved glutamic acid residues which might be indicative of the family being a metallo-peptidase.
Jiyao W et al.(2023). "The conserved domain database in 2023.",