T-cell surface glycoprotein CD1e, soluble is required for the presentation of glycolipid antigens on the cell surface. The membrane-associated form is not active (By similarity). Heterodimer with B2M (beta-2-microglobulin). The association with B2M appears to be facilitated by the presence of the propeptide (By similarity). Predominantly localized in the trans-Golgi network in immature dendritic cells, and as a cleaved, soluble protein in the lysosome lumen of mature dendritic cells. Mono-ubiquitinated. Proteolytically cleaved in endosomes to yield a soluble form.