Involved in the export of arginine. Important to control the intracellular level of arginine and the correct balance between arginine and lysine. L-arginine(in) = L-arginine(out) In Yersinia pestis biovar Mediaevails str. 91001, the CDS has been disrupted by IS100 element. Belongs to the LysE/ArgO transporter (TC 2.A.75) family. PubMed:15368893 (AE017042) sequence differs from that shown due to the presence of an IS100 insertion sequence. This gene in strain 91001 is probably a pseudogene.