Abstract:T-cell membrane scaffold proteins play important roles in T cell biology, functioning as multi-functional signaling hubs. CD6 assembles a large intracellular signalosome but, unlike typical membrane-attached scaffolds like LAT or PAG, it has a sizeable ectodomain that binds a well-characterized ligand, CD166. It is unclear whether CD6 has net inhibitory or costimulatory functions or how its ectodomain influences these activities. To explore these questions, we dissected the signaling functions of the extracell… Show more
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