PMID- 2970642 OWN - NLM STAT- MEDLINE DCOM- 19881006 LR - 20190501 IS - 0027-8424 (Print) IS - 1091-6490 (Electronic) IS - 0027-8424 (Linking) VI - 85 IP - 17 DP - 1988 Sep TI - Isolation and characterization of cDNAs coding for the beta subunit of the high-affinity receptor for immunoglobulin E. PG - 6483-7 AB - Among receptors that bind the Fc region of immunoglobulins ("Fc receptors"), only the one with high affinity for immunoglobulin E (IgE) is known to consist of more than a single polypeptide. In addition to the IgE-binding alpha chain, the receptor contains a single beta chain and two, disulfide-linked, gamma chains. From a cDNA library of a rat mucosal mast cell tumor, from which we recently cloned cDNAs coding for the alpha chain, we have now isolated cDNAs coding for the beta subunit. In vitro transcription-translation of the cDNA directed the synthesis of a polypeptide reactive with two distinctive anti-beta monoclonal antibodies and whose molecular weight was identical to that of authentic beta chains. Polyclonal antibodies to beta peptides expressed in Escherichia coli reacted with intact receptors and isolated beta chains. The gene encodes a protein of 243 residues with no leader sequence. A hydropathicity plot suggests that the polypeptide crosses the plasma membrane four times. The epitope recognized by one of the monoclonal antibodies was localized to the NH2 terminus; that by the other was localized to the COOH terminus. Since those antibodies react with membranes and not with intact cells, we suggest that both ends of the beta subunit are cytoplasmic. RNA transfer blots at high stringency failed to reveal mRNA for beta chains in a variety of cells (in particular, monocytes) that do not contain the high-affinity receptor for IgE. FAU - Kinet, J P AU - Kinet JP AD - Section on Chemical Immunology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD 20892. FAU - Blank, U AU - Blank U FAU - Ra, C AU - Ra C FAU - White, K AU - White K FAU - Metzger, H AU - Metzger H FAU - Kochan, J AU - Kochan J LA - eng SI - GENBANK/J03845 SI - GENBANK/M22923 SI - GENBANK/M22924 PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Proc Natl Acad Sci U S A JT - Proceedings of the National Academy of Sciences of the United States of America JID - 7505876 RN - 0 (Antigens, Differentiation) RN - 0 (Macromolecular Substances) RN - 0 (Receptors, IgE) RN - 37341-29-0 (Immunoglobulin E) RN - 9007-49-2 (DNA) SB - IM MH - Amino Acid Sequence MH - Animals MH - Antigens, Differentiation/*genetics MH - Base Sequence MH - Basophils/immunology MH - Cloning, Molecular MH - DNA/genetics/*isolation & purification MH - *Genes MH - Immunoglobulin E/*metabolism MH - Leukemia, Experimental/immunology MH - Macromolecular Substances MH - Molecular Sequence Data MH - Rats MH - Receptors, IgE PMC - PMC281997 EDAT- 1988/09/01 00:00 MHDA- 1988/09/01 00:01 PMCR- 1989/03/01 CRDT- 1988/09/01 00:00 PHST- 1988/09/01 00:00 [pubmed] PHST- 1988/09/01 00:01 [medline] PHST- 1988/09/01 00:00 [entrez] PHST- 1989/03/01 00:00 [pmc-release] AID - 10.1073/pnas.85.17.6483 [doi] PST - ppublish SO - Proc Natl Acad Sci U S A. 1988 Sep;85(17):6483-7. doi: 10.1073/pnas.85.17.6483.