View source for 3dhj


==Beta 2 microglobulin mutant W60C==
<StructureSection load='3dhj' size='340' side='right'caption='[[3dhj]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3dhj]] 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=3DHJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3DHJ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2&#8491;</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=3dhj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3dhj OCA], [https://pdbe.org/3dhj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3dhj RCSB], [https://www.ebi.ac.uk/pdbsum/3dhj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3dhj ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/B2MG_HUMAN B2MG_HUMAN] Defects in B2M are the cause of hypercatabolic hypoproteinemia (HYCATHYP) [MIM:[https://omim.org/entry/241600 241600]. Affected individuals show marked reduction in serum concentrations of immunoglobulin and albumin, probably due to rapid degradation.<ref>PMID:16549777</ref>   Note=Beta-2-microglobulin may adopt the fibrillar configuration of amyloid in certain pathologic states. The capacity to assemble into amyloid fibrils is concentration dependent. Persistently high beta(2)-microglobulin serum levels lead to amyloidosis in patients on long-term hemodialysis.<ref>PMID:3532124</ref> <ref>PMID:1336137</ref> <ref>PMID:7554280</ref> <ref>PMID:4586824</ref> <ref>PMID:8084451</ref> <ref>PMID:12119416</ref> <ref>PMID:12796775</ref> <ref>PMID:16901902</ref> <ref>PMID:16491088</ref> <ref>PMID:17646174</ref> <ref>PMID:18835253</ref> <ref>PMID:18395224</ref> <ref>PMID:19284997</ref> 
== Function ==
[https://www.uniprot.org/uniprot/B2MG_HUMAN B2MG_HUMAN] Component of the class I major histocompatibility complex (MHC). Involved in the presentation of peptide antigens to the immune system.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/dh/3dhj_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=3dhj ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Beta2-microglobulin (beta2m) is the light chain component of class I major histocompatibility complex (MHC-I). beta2m is an intrinsically amyloidogenic protein that can assemble into amyloid fibrils in vitro and in vivo. Several recent reports suggested that the polypeptide loop comprised between beta-strands D and E of beta2m is important for protein stability and for the protein propensity to aggregate as amyloid fibrils. In particular, the roles of Trp60 for MHC-I assembly and beta2m stability have been highlighted by showing that the beta2m Trp60--&gt;Gly mutant is more stable and less prone to aggregation than the wild type protein. To further analyse such properties, the Trp60--&gt;Cys and Asp59--&gt;Pro beta2m mutants have been expressed, purified, and their crystal structures determined. The stability to thermal denaturation and propensity to fibrillar aggregation have also been analysed. The experimental evidences gathered on the two mutants reinforce the hypothesis that conformational strain in the DE loop can affect beta2m stability and amyloid aggregation properties.

DE loop mutations affect beta2-microglobulin stability and amyloid aggregation.,Ricagno S, Colombo M, de Rosa M, Sangiovanni E, Giorgetti S, Raimondi S, Bellotti V, Bolognesi M Biochem Biophys Res Commun. 2008 Dec 5;377(1):146-50. Epub 2008 Oct 1. PMID:18835253<ref>PMID:18835253</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3dhj" style="background-color:#fffaf0;"></div>

==See Also==
*[[Beta-2 microglobulin 3D structures|Beta-2 microglobulin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Bellotti V]]
[[Category: Bolognesi M]]
[[Category: Colombo M]]
[[Category: Giorgetti S]]
[[Category: Ricagno S]]
[[Category: De Rosa M]]