High affinity human IgE receptor (Fc epsilon RI). Analysis of functional domains of the alpha-subunit with monoclonal antibodies

The binding of IgE to the high affinity Fc epsilon receptor (Fc epsilon RI) on mast cells and basophils is mediated by the alpha-subunit of the tetrameric receptor complex. Based on sequence homologies, the 50-kDa alpha-subunit is a member of the immunoglobulin superfamily of proteins and has two pr...

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Veröffentlicht in:The Journal of biological chemistry 1991-06, Vol.266 (17), p.11245-11251
Hauptverfasser: RISKE, F, HAKIMI, J, MALLAMACI, M, GRIFFIN, M, PILSON, B, TOBKES, N, LIN, P, DANHO, W, KOCHAN, J, CHIZZONITE, R
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container_end_page 11251
container_issue 17
container_start_page 11245
container_title The Journal of biological chemistry
container_volume 266
creator RISKE, F
HAKIMI, J
MALLAMACI, M
GRIFFIN, M
PILSON, B
TOBKES, N
LIN, P
DANHO, W
KOCHAN, J
CHIZZONITE, R
description The binding of IgE to the high affinity Fc epsilon receptor (Fc epsilon RI) on mast cells and basophils is mediated by the alpha-subunit of the tetrameric receptor complex. Based on sequence homologies, the 50-kDa alpha-subunit is a member of the immunoglobulin superfamily of proteins and has two predicted disulfide-bonded loops. Monoclonal antibodies specific for the human alpha-subunit have been identified and separated into two major classes: inhibitory and noninhibitory antibodies. Inhibitory antibodies (i.e. 15A5) block 125I-IgE binding to a recombinant chimeric alpha-subunit (ch-alpha-protein) expressed on Chinese hamster ovary cells and immunoprecipitate 125I-labeled purified ch-alpha-protein. Noninhibitory antibodies (i.e. 22E7) immunoprecipitate both 125I-labeled ch-alpha-protein and the soluble complex of 125I-IgE cross-linked to ch-alpha-protein but do not block 125I-IgE binding to the ch-alpha-protein expressed on Chinese hamster ovary cells. Both classes of antibodies bind to natural Fc epsilon RI present on human basophils and induce histamine release from these cells. Inhibitory antibody 15A5 specifically binds to a peptide corresponding to amino acids 125-140 of the putative second domain of the alpha-subunit sequence. All the inhibitory antibodies compete with 125I-15A5 for binding to the ch-alpha-protein, indicating that these antibodies recognize inhibitory epitopes that are either identical or sterically overlapping. Noninhibitory antibodies (i.e. 22E7) do not block 125I-15A5 binding to the ch-alpha-protein. These data suggest that antibodies binding to the predicted second domain of the alpha-subunit can inhibit IgE binding to the alpha-subunit, while antibodies binding at a distance from this site do not inhibit IgE binding. These inhibitory antibodies may block IgE binding to the ch-alpha-protein by direct overlap, steric inhibition, or induced conformational changes of the receptor contact points for IgE.
doi_str_mv 10.1016/S0021-9258(18)99155-6
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Analysis of functional domains of the alpha-subunit with monoclonal antibodies</title><title>The Journal of biological chemistry</title><addtitle>J Biol Chem</addtitle><description>The binding of IgE to the high affinity Fc epsilon receptor (Fc epsilon RI) on mast cells and basophils is mediated by the alpha-subunit of the tetrameric receptor complex. Based on sequence homologies, the 50-kDa alpha-subunit is a member of the immunoglobulin superfamily of proteins and has two predicted disulfide-bonded loops. Monoclonal antibodies specific for the human alpha-subunit have been identified and separated into two major classes: inhibitory and noninhibitory antibodies. Inhibitory antibodies (i.e. 15A5) block 125I-IgE binding to a recombinant chimeric alpha-subunit (ch-alpha-protein) expressed on Chinese hamster ovary cells and immunoprecipitate 125I-labeled purified ch-alpha-protein. 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Psychology</topic><topic>Histamine Release</topic><topic>Humans</topic><topic>Hybridomas - immunology</topic><topic>Immunoglobulin E - isolation &amp; purification</topic><topic>Immunoglobulin E - metabolism</topic><topic>Kinetics</topic><topic>leukocytes (basophilic)</topic><topic>Macromolecular Substances</topic><topic>mast cells</topic><topic>Mice</topic><topic>Mice, Inbred BALB C - immunology</topic><topic>Miscellaneous</topic><topic>Molecular and cellular biology</topic><topic>Molecular Weight</topic><topic>Rats</topic><topic>Receptors, Fc - genetics</topic><topic>Receptors, Fc - metabolism</topic><topic>Receptors, IgE</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>RISKE, F</creatorcontrib><creatorcontrib>HAKIMI, J</creatorcontrib><creatorcontrib>MALLAMACI, M</creatorcontrib><creatorcontrib>GRIFFIN, M</creatorcontrib><creatorcontrib>PILSON, B</creatorcontrib><creatorcontrib>TOBKES, N</creatorcontrib><creatorcontrib>LIN, P</creatorcontrib><creatorcontrib>DANHO, W</creatorcontrib><creatorcontrib>KOCHAN, J</creatorcontrib><creatorcontrib>CHIZZONITE, R</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Biochemistry Abstracts 1</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>The Journal of biological chemistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>RISKE, F</au><au>HAKIMI, J</au><au>MALLAMACI, M</au><au>GRIFFIN, M</au><au>PILSON, B</au><au>TOBKES, N</au><au>LIN, P</au><au>DANHO, W</au><au>KOCHAN, J</au><au>CHIZZONITE, R</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High affinity human IgE receptor (Fc epsilon RI). Analysis of functional domains of the alpha-subunit with monoclonal antibodies</atitle><jtitle>The Journal of biological chemistry</jtitle><addtitle>J Biol Chem</addtitle><date>1991-06-15</date><risdate>1991</risdate><volume>266</volume><issue>17</issue><spage>11245</spage><epage>11251</epage><pages>11245-11251</pages><issn>0021-9258</issn><eissn>1083-351X</eissn><coden>JBCHA3</coden><abstract>The binding of IgE to the high affinity Fc epsilon receptor (Fc epsilon RI) on mast cells and basophils is mediated by the alpha-subunit of the tetrameric receptor complex. Based on sequence homologies, the 50-kDa alpha-subunit is a member of the immunoglobulin superfamily of proteins and has two predicted disulfide-bonded loops. Monoclonal antibodies specific for the human alpha-subunit have been identified and separated into two major classes: inhibitory and noninhibitory antibodies. Inhibitory antibodies (i.e. 15A5) block 125I-IgE binding to a recombinant chimeric alpha-subunit (ch-alpha-protein) expressed on Chinese hamster ovary cells and immunoprecipitate 125I-labeled purified ch-alpha-protein. Noninhibitory antibodies (i.e. 22E7) immunoprecipitate both 125I-labeled ch-alpha-protein and the soluble complex of 125I-IgE cross-linked to ch-alpha-protein but do not block 125I-IgE binding to the ch-alpha-protein expressed on Chinese hamster ovary cells. Both classes of antibodies bind to natural Fc epsilon RI present on human basophils and induce histamine release from these cells. Inhibitory antibody 15A5 specifically binds to a peptide corresponding to amino acids 125-140 of the putative second domain of the alpha-subunit sequence. All the inhibitory antibodies compete with 125I-15A5 for binding to the ch-alpha-protein, indicating that these antibodies recognize inhibitory epitopes that are either identical or sterically overlapping. Noninhibitory antibodies (i.e. 22E7) do not block 125I-15A5 binding to the ch-alpha-protein. These data suggest that antibodies binding to the predicted second domain of the alpha-subunit can inhibit IgE binding to the alpha-subunit, while antibodies binding at a distance from this site do not inhibit IgE binding. These inhibitory antibodies may block IgE binding to the ch-alpha-protein by direct overlap, steric inhibition, or induced conformational changes of the receptor contact points for IgE.</abstract><cop>Bethesda, MD</cop><pub>American Society for Biochemistry and Molecular Biology</pub><pmid>1710221</pmid><doi>10.1016/S0021-9258(18)99155-6</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record>
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ispartof The Journal of biological chemistry, 1991-06, Vol.266 (17), p.11245-11251
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects Animals
Antibodies, Monoclonal
Antigen-Antibody Complex
Antigens, Differentiation, B-Lymphocyte - genetics
Antigens, Differentiation, B-Lymphocyte - metabolism
Basophils - immunology
Biological and medical sciences
Cell receptors
Cell structures and functions
Chimera
Fluorescent Antibody Technique
Fundamental and applied biological sciences. Psychology
Histamine Release
Humans
Hybridomas - immunology
Immunoglobulin E - isolation & purification
Immunoglobulin E - metabolism
Kinetics
leukocytes (basophilic)
Macromolecular Substances
mast cells
Mice
Mice, Inbred BALB C - immunology
Miscellaneous
Molecular and cellular biology
Molecular Weight
Rats
Receptors, Fc - genetics
Receptors, Fc - metabolism
Receptors, IgE
title High affinity human IgE receptor (Fc epsilon RI). Analysis of functional domains of the alpha-subunit with monoclonal antibodies
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