transporter, basic amino acid/polyamine antiporter (APA) family
This family includes several families of antiporters that, rather commonly, are encoded next to decarboxylases that convert one of the antiporter substrates into the other. This arrangement allows a cycle that can remove proteins from the cytoplasm and thereby protect against acidic conditions. [Transport and binding proteins, Amino acids, peptides and amines]
Jiyao W et al.(2023). "The conserved domain database in 2023.",