Abstract
Abstract We are studying the immune recognition of diseased or damaged cells. In cytotoxic cells, the C-type lectin-like receptor NKG2D plays a key role in this distinction. A number of related receptors are expressed on immune cells and we are studying their function. CLEC-2 is an activating receptor which is also expressed on platelets. We have crystallized CLEC-2 and solved its structure. We have used recombinant CLEC-2 as a probe to identify an endogenous ligand for CLEC-2, which is known as podoplanin. The podoplanin-CLEC-2 interaction triggers an activating signal in the cell expressing CLEC-2. We have also solved the crystal structure of rhodocytin, an exogenous ligand for CLEC-2. The structures of both ligand and receptor allow us to produce molecular models of the interactions and its effects. These suggest that the ligand-receptor interactions will cluster CLEC-2 on the cell surface. We have used surface plasmon resonance to define the binding characteristics of the interactions of CLEC-2 with both its exogenous and endogenous ligands.
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