Function:Receptor involved in the costimulatory signal essential for T-lymphocyte proliferation and interleukin-2 production , by binding CD28 or CTLA-4. May play a critical role in the early events of T-cell activation and costimulation of naive T-cells , such as deciding between immunity and anergy that is made by T-cells within 24 hours after activation. Isoform 2 interferes with the formation of CD86 clusters , and thus acts as a negative regulator of T-cell activation. ,online information:CD86 entry ,PTM:Polyubiquitinated; which is promoted by MARCH8 and results in endocytosis and lysosomal degradation. ,similarity:Contains 1 Ig-like C2-type (immunoglobulin-like) domain. ,similarity:Contains 1 Ig-like V-type (immunoglobulin-like) domain. ,subunit:Interacts with MARCH8. Interacts with human herpesvirus 8 MIR2 protein (Probable) . Interacts with adenovirus subgroup B fiber proteins and acts as a receptor for these viruses. ,tissue specificity:Expressed by activated B-lymphocytes and monocytes. ,
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