Download MendeleyCrystal structure of LIR-2 (ILT4) at 1.8 A: differences from LIR-1 (ILT2) in regions implicated in the binding of the Human Cytomegalovirus class I MHC homolog UL18.
Willcox, B.E., Thomas, L.M., Chapman, T.L., Heikema, A.P., West, A.P., Bjorkman, P.J.(2002) BMC Struct Biol 2: 6-6
- PubMed: 12390682
- DOI: https://doi.org/10.1186/1472-6807-2-6
- Primary Citation of Related Structures:
2GW5 - PubMed Abstract:
Leukocyte Immunoglobulin-like Receptor-1 (LIR-1) and LIR-2 (also known as ILT2 and ILT4 respectively) are highly related cell surface receptors that bind a broad range of class I MHC molecules with low (microM) affinities. Expressed on monocytic cells and macrophages, both molecules transmit inhibitory signals after binding ligands. In addition to binding host class I MHC, the LIR-1 molecule, which is also expressed on lymphoid tissues, binds with a high (nM) affinity to UL18, a class I MHC homolog encoded by Human Cytomegalovirus (HCMV). In comparison, LIR-2 binds UL18 only weakly (microM KD). To understand how HCMV preferentially targets the more broadly expressed LIR-1 molecule, we determined the crystal structure of a ligand-binding fragment of LIR-2, and compared this to the existing high-resolution crystal structure of LIR-1.
Organizational Affiliation:
Division of Biology 156-29, California Institute of Technology, Pasadena, California 91125, USA. b.willcox@bham.ac.uk
