3ave: Difference between revisions
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
==Crystal Structure of the Fucosylated Fc Fragment from Human Immunoglobulin G1== | |||
<StructureSection load='3ave' size='340' side='right' caption='[[3ave]], [[Resolution|resolution]] 2.00Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3ave]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=2dtq 2dtq]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AVE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3AVE FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene>, <scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1h3x|1h3x]], [[2dts|2dts]], [[1e4k|1e4k]], [[1t83|1t83]], [[1l6x|1l6x]], [[3d6g|3d6g]], [[1hzh|1hzh]]</td></tr> | |||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">IGHG1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</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=3ave FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ave OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3ave RCSB], [http://www.ebi.ac.uk/pdbsum/3ave PDBsum]</span></td></tr> | |||
</table> | |||
== Disease == | |||
[[http://www.uniprot.org/uniprot/IGHG1_HUMAN IGHG1_HUMAN]] Defects in IGHG1 are a cause of multiple myeloma (MM) [MIM:[http://omim.org/entry/254500 254500]]. MM is a malignant tumor of plasma cells usually arising in the bone marrow and characterized by diffuse involvement of the skeletal system, hyperglobulinemia, Bence-Jones proteinuria and anemia. Complications of multiple myeloma are bone pain, hypercalcemia, renal failure and spinal cord compression. The aberrant antibodies that are produced lead to impaired humoral immunity and patients have a high prevalence of infection. Amyloidosis may develop in some patients. Multiple myeloma is part of a spectrum of diseases ranging from monoclonal gammopathy of unknown significance (MGUS) to plasma cell leukemia. Note=A chromosomal aberration involving IGHG1 is found in multiple myeloma. Translocation t(11;14)(q13;q32) with the IgH locus. Translocation t(11;14)(q13;q32) with CCND1; translocation t(4;14)(p16.3;q32.3) with FGFR3; translocation t(6;14)(p25;q32) with IRF4. | |||
== Function == | |||
== | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | |||
Removal of the fucose residue from the oligosaccharides attached to Asn297 of human immunoglobulin G1 (IgG1) results in a significant enhancement of antibody-dependent cellular cytotoxicity (ADCC) via improved IgG1 binding to Fcgamma receptor IIIa. To provide structural insight into the mechanisms of affinity enhancement, we determined the crystal structure of the nonfucosylated Fc fragment and compared it with that of fucosylated Fc. The overall conformations of the fucosylated and nonfucosylated Fc fragments were similar except for hydration mode around Tyr296. Stable-isotope-assisted NMR analyses confirmed the similarity of the overall structures between fucosylated and nonfucosylated Fc fragments in solution. These data suggest that the glycoform-dependent ADCC enhancement is attributed to a subtle conformational alteration in a limited region of IgG1-Fc. Furthermore, the electron density maps revealed that the traces between Asp280 and Asn297 of our fucosylated and nonfucosylated Fc crystals were both different from that in previously reported isomorphous Fc crystals. | |||
Structural comparison of fucosylated and nonfucosylated Fc fragments of human immunoglobulin G1.,Matsumiya S, Yamaguchi Y, Saito J, Nagano M, Sasakawa H, Otaki S, Satoh M, Shitara K, Kato K J Mol Biol. 2007 May 4;368(3):767-79. Epub 2007 Feb 22. PMID:17368483<ref>PMID:17368483</ref> | |||
== | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Kato, K | [[Category: Kato, K]] | ||
[[Category: Matsumiya, S | [[Category: Matsumiya, S]] | ||
[[Category: Nagano, M | [[Category: Nagano, M]] | ||
[[Category: Otaki, S | [[Category: Otaki, S]] | ||
[[Category: Saito, J | [[Category: Saito, J]] | ||
[[Category: Sasakawa, H | [[Category: Sasakawa, H]] | ||
[[Category: Satoh, M | [[Category: Satoh, M]] | ||
[[Category: Shitara, K | [[Category: Shitara, K]] | ||
[[Category: Yamaguchi, Y | [[Category: Yamaguchi, Y]] | ||
[[Category: Igg1]] | [[Category: Igg1]] | ||
[[Category: Immune system]] | [[Category: Immune system]] | ||
[[Category: Immunoglobulin]] | [[Category: Immunoglobulin]] | ||
[[Category: Immunoglobulin-like beta-sandwich]] | [[Category: Immunoglobulin-like beta-sandwich]] | ||