Plays a role in the modulation of host immune response by modulating T-cell function. Interacts with host PTPRC/CD45 and thereby reduces host TCR signaling and T-cell proliferation. Interacts with host PTPRC; this interaction affects T-cell signaling. Localizes to the host cell membrane when highly glycosylated while less glycosylated forms are found on the endoplasmic reticulum. Glycosylated. Belongs to the RL11 family.