Isolation and expression of cDNA clones encoding a human receptor for IgG (Fc gamma RII)

doi:10.1084/jem.166.6.1668

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Isolation and expression of cDNA clones encoding a human receptor for IgG (Fc gamma RII)

SG Stuart, ML Trounstine, DJ Vaux, T Koch, CL Martens, I Mellman and KW Moore
Department of Immunology, DNAX Research Institute of Molecular and Cellular Biology, Inc., Palo Alto, California 94304.

We have cloned and expressed a cDNA encoding a human receptor for IgG (Fc gamma R) from the monocyte cell line U937. The deduced structure is a 35-kD transmembrane protein with homology to the mouse Fc[gamma 2b/gamma 1] receptor amino acid sequence of approximately 60% in the extracellular domain. The signal sequence is homologous to the mouse Fc gamma R alpha cDNA clone, while the transmembrane domain shares homology with mouse Fc gamma R beta cDNAs. The cytoplasmic domain is apparently unique. The extracellular domain shows significant homology to proteins of the Ig gene superfamily, including the human c-fms protooncogene/CSF-1 receptor. Mouse Ltk- cells transfected with the human Fc gamma R cDNA express a cell-surface receptor that selectively binds human IgG and is recognized by the anti-Fc gamma RII mAb IV.3. Antibodies against peptides derived from the human Fc gamma R sequence specifically stain U937 cells, but not an Fc gamma RII-bearing B- lymphoblastoid cell line (Daudi). These results identify the human Fc gamma RII as the homologue of mouse Fc[gamma 2b/gamma 1] R, and provide evidence for heterogeneity of Fc gamma RII expressed on monocytes and B cells.
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