|
|
| (3 intermediate revisions not shown.) |
| Line 1: |
Line 1: |
| | | | |
| | ==HUMAN FC GAMMA RECEPTOR IIB ECTODOMAIN (CD32)== | | ==HUMAN FC GAMMA RECEPTOR IIB ECTODOMAIN (CD32)== |
| - | <StructureSection load='2fcb' size='340' side='right' caption='[[2fcb]], [[Resolution|resolution]] 1.74Å' scene=''> | + | <StructureSection load='2fcb' size='340' side='right'caption='[[2fcb]], [[Resolution|resolution]] 1.74Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2fcb]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FCB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2FCB FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2fcb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FCB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2FCB FirstGlance]. <br> |
| - | </td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2fcb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fcb OCA], [http://pdbe.org/2fcb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2fcb RCSB], [http://www.ebi.ac.uk/pdbsum/2fcb PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2fcb ProSAT]</span></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.74Å</td></tr> |
| | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2fcb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fcb OCA], [https://pdbe.org/2fcb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2fcb RCSB], [https://www.ebi.ac.uk/pdbsum/2fcb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2fcb ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Disease == | | == Disease == |
| - | [[http://www.uniprot.org/uniprot/FCG2B_HUMAN FCG2B_HUMAN]] Note=A chromosomal aberration involving FCGR2B is found in a follicular lymphoma. Translocation t(1;22)(q22;q11). The translocation leads to the hyperexpression of the receptor. This may play a role in the tumor progression. Defects in FCGR2B are a cause of susceptibility to systemic lupus erythematosus (SLE) [MIM:[http://omim.org/entry/152700 152700]]. A chronic, relapsing, inflammatory, and often febrile multisystemic disorder of connective tissue, characterized principally by involvement of the skin, joints, kidneys and serosal membranes. It is of unknown etiology, but is thought to represent a failure of the regulatory mechanisms of the autoimmune system. The disease is marked by a wide range of system dysfunctions, an elevated erythrocyte sedimentation rate, and the formation of LE cells in the blood or bone marrow.<ref>PMID:12115230</ref> <ref>PMID:20385827</ref> | + | [https://www.uniprot.org/uniprot/FCG2B_HUMAN FCG2B_HUMAN] Note=A chromosomal aberration involving FCGR2B is found in a follicular lymphoma. Translocation t(1;22)(q22;q11). The translocation leads to the hyperexpression of the receptor. This may play a role in the tumor progression. Defects in FCGR2B are a cause of susceptibility to systemic lupus erythematosus (SLE) [MIM:[https://omim.org/entry/152700 152700]. A chronic, relapsing, inflammatory, and often febrile multisystemic disorder of connective tissue, characterized principally by involvement of the skin, joints, kidneys and serosal membranes. It is of unknown etiology, but is thought to represent a failure of the regulatory mechanisms of the autoimmune system. The disease is marked by a wide range of system dysfunctions, an elevated erythrocyte sedimentation rate, and the formation of LE cells in the blood or bone marrow.<ref>PMID:12115230</ref> <ref>PMID:20385827</ref> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/FCG2B_HUMAN FCG2B_HUMAN]] Receptor for the Fc region of complexed or aggregated immunoglobulins gamma. Low affinity receptor. Involved in a variety of effector and regulatory functions such as phagocytosis of immune complexes and modulation of antibody production by B-cells. Binding to this receptor results in down-modulation of previous state of cell activation triggered via antigen receptors on B-cells (BCR), T-cells (TCR) or via another Fc receptor. Isoform IIB1 fails to mediate endocytosis or phagocytosis. Isoform IIB2 does not trigger phagocytosis. | + | [https://www.uniprot.org/uniprot/FCG2B_HUMAN FCG2B_HUMAN] Receptor for the Fc region of complexed or aggregated immunoglobulins gamma. Low affinity receptor. Involved in a variety of effector and regulatory functions such as phagocytosis of immune complexes and modulation of antibody production by B-cells. Binding to this receptor results in down-modulation of previous state of cell activation triggered via antigen receptors on B-cells (BCR), T-cells (TCR) or via another Fc receptor. Isoform IIB1 fails to mediate endocytosis or phagocytosis. Isoform IIB2 does not trigger phagocytosis. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
| Line 15: |
Line 16: |
| | <jmolCheckbox> | | <jmolCheckbox> |
| | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/fc/2fcb_consurf.spt"</scriptWhenChecked> | | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/fc/2fcb_consurf.spt"</scriptWhenChecked> |
| - | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | + | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked> |
| | <text>to colour the structure by Evolutionary Conservation</text> | | <text>to colour the structure by Evolutionary Conservation</text> |
| | </jmolCheckbox> | | </jmolCheckbox> |
| Line 33: |
Line 34: |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Huber, R]] | + | [[Category: Large Structures]] |
| - | [[Category: Jacob, U]] | + | [[Category: Huber R]] |
| - | [[Category: Sondermann, P]] | + | [[Category: Jacob U]] |
| - | [[Category: Cd32]] | + | [[Category: Sondermann P]] |
| - | [[Category: Fc]]
| + | |
| - | [[Category: Immune system]]
| + | |
| - | [[Category: Receptor]]
| + | |
| Structural highlights
Disease
FCG2B_HUMAN Note=A chromosomal aberration involving FCGR2B is found in a follicular lymphoma. Translocation t(1;22)(q22;q11). The translocation leads to the hyperexpression of the receptor. This may play a role in the tumor progression. Defects in FCGR2B are a cause of susceptibility to systemic lupus erythematosus (SLE) [MIM:152700. A chronic, relapsing, inflammatory, and often febrile multisystemic disorder of connective tissue, characterized principally by involvement of the skin, joints, kidneys and serosal membranes. It is of unknown etiology, but is thought to represent a failure of the regulatory mechanisms of the autoimmune system. The disease is marked by a wide range of system dysfunctions, an elevated erythrocyte sedimentation rate, and the formation of LE cells in the blood or bone marrow.[1] [2]
Function
FCG2B_HUMAN Receptor for the Fc region of complexed or aggregated immunoglobulins gamma. Low affinity receptor. Involved in a variety of effector and regulatory functions such as phagocytosis of immune complexes and modulation of antibody production by B-cells. Binding to this receptor results in down-modulation of previous state of cell activation triggered via antigen receptors on B-cells (BCR), T-cells (TCR) or via another Fc receptor. Isoform IIB1 fails to mediate endocytosis or phagocytosis. Isoform IIB2 does not trigger phagocytosis.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Fcgamma-receptors (FcgammaRs) represent the link between the humoral and cellular immune responses. Via the binding to FcgammaR-positive cells, immunocomplexes trigger several functions such as endocytosis, antibody-dependent cell-mediated cytotoxity (ADCC) and the release of mediators, making them a valuable target for the modulation of the immune system. We solved the crystal structure of the soluble human Fcgamma-receptor IIb (sFcgammaRIIb) to 1.7 A resolution. The structure reveals two typical immunoglobulin (Ig)-like domains enclosing an angle of approximately 70 degrees, leading to a heart-shaped overall structure. In contrast to the observed flexible arrangement of the domains in other members of the Ig superfamily, the two domains are anchored by several hydrogen bonds. The structure reveals that the residues relevant for IgG binding, which were already partially characterized by mutagenesis studies, are located within the BC, C'E and FG loops between the beta-strands of the second domain. Moreover, we discuss a model for the sFcgammaRIIb:IgG complex. In this model, two FcgammaR molecules bind one IgG molecule with their second domains, while the first domain points away from the complex and is therefore available for binding other cell surface molecules, by which potential immunosuppressing functions could be mediated.
Crystal structure of the soluble form of the human fcgamma-receptor IIb: a new member of the immunoglobulin superfamily at 1.7 A resolution.,Sondermann P, Huber R, Jacob U EMBO J. 1999 Mar 1;18(5):1095-103. PMID:10064577[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Kyogoku C, Dijstelbloem HM, Tsuchiya N, Hatta Y, Kato H, Yamaguchi A, Fukazawa T, Jansen MD, Hashimoto H, van de Winkel JG, Kallenberg CG, Tokunaga K. Fcgamma receptor gene polymorphisms in Japanese patients with systemic lupus erythematosus: contribution of FCGR2B to genetic susceptibility. Arthritis Rheum. 2002 May;46(5):1242-54. PMID:12115230 doi:10.1002/art.10257
- ↑ Willcocks LC, Carr EJ, Niederer HA, Rayner TF, Williams TN, Yang W, Scott JA, Urban BC, Peshu N, Vyse TJ, Lau YL, Lyons PA, Smith KG. A defunctioning polymorphism in FCGR2B is associated with protection against malaria but susceptibility to systemic lupus erythematosus. Proc Natl Acad Sci U S A. 2010 Apr 27;107(17):7881-5. doi:, 10.1073/pnas.0915133107. Epub 2010 Apr 12. PMID:20385827 doi:10.1073/pnas.0915133107
- ↑ Sondermann P, Huber R, Jacob U. Crystal structure of the soluble form of the human fcgamma-receptor IIb: a new member of the immunoglobulin superfamily at 1.7 A resolution. EMBO J. 1999 Mar 1;18(5):1095-103. PMID:10064577 doi:10.1093/emboj/18.5.1095
|
