The Basic Amino Acid Antiporter (ArcD) family (TC# 2.A.118) is a constituent of the IT superfamily.[1][2][3] This family consists of proteins from Gram-negative and Gram-positive bacteria (e.g., Streptococcus, Escherichia, Salmonella, Fusobacterium and Borrelia species). The proteins are of about 480 amino acyl residues (aas) in length and have 10-12 putative transmembrane segments (TMSs). Functionally characterized homologues are in the DcuC (TC #2.A.61) and ArsB (TC #2.A.4) families. Some members of the family probably catalyze arginine/ornithine or citrulline/ornithine antiport.[4][5]
^Rimaux, Tom; Rivière, Audrey; Hebert, Elvira María; Mozzi, Fernanda; Weckx, Stefan; De Vuyst, Luc; Leroy, Frédéric (2013-04-01). "A putative transport protein is involved in citrulline excretion and re-uptake during arginine deiminase pathway activity by Lactobacillus sakei". Research in Microbiology. 164 (3): 216–225. doi:10.1016/j.resmic.2012.11.004. hdl:11336/2348. ISSN1769-7123. PMID23178175.