Structure of signal-regulatory protein alpha: a link to antigen receptor evolution.
Signal-regulatory protein alpha (SIRPalpha) is a myeloid membrane receptor that interacts with the membrane protein CD47, a marker of self. We have solved the structure of the complete extracellular portion of SIRPalpha, comprising three immunoglobulin superfamily domains, by x-ray crystallography to 2.5 A resolution. These data, together with previous data on the N-terminal domain and its ligand CD47 (possessing a single immunoglobulin superfamily domain), show that the CD47-SIRPalpha intera...Expand abstract
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