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Overview
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Background
CD64 (FcγRI) is a cell surface receptor for Fc region of IgG. It is composed of specific ligand binding α subunit and promiscuous γ subunit, which is indispensable for tyrosine-based signaling. However, even the α subunit can transduce signals leading to cellular effector functions. The isoform FcγRIa1 binds human IgG with high affinity, has limited myeloid cell distribution, and a relatively large intracellular domain. Products of related genes include FcγRIb and FcγRIc isoforms, but these specify low affinity IgG receptors if functionally expressed at all. Besides a role in antigen clearance, FcgammaRI (a1) can potently enhance MHC class I and II antigen presentation in vitro and in vivo.
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Overview