RTX toxin acyltransferase family
Members of this family are enzymes EC:2.3.1.-. involved in fatty acylation of the protoxins (HlyA) at lysine residues, thereby converting them to the active toxin. Acyl-acyl carrier protein (ACP) is the essential acyl donor. This family show a number of conserved residues that are possible candidates for participation in acyl transfer. Site-directed mutagenesis of the single conserved histidine residue in Swiss:P06736 resulted in complete inactivation of the enzyme.
Jiyao W et al.(2023). "The conserved domain database in 2023.",