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Structures of Ly49 NK receptors. (A) Ribbon drawing of the Ly49A C-type lectin-like domain (1QO3). Secondary structure elements are labeled. β-strands and loops are cyan; α-helices are red. (B) Structure of the “closed” Ly49A homodimer. Secondary structure elements that participate in formation of the dimer interface are labeled. The α2 helices are juxtaposed. (C) Structure of the “open” Ly49C homodimer (3C8J). The α2 helices do not make contact across the dimer interface.
