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== | ==Structure of human ceruloplasmin at 2.6 A resolution== | ||
[[http://www.uniprot.org/uniprot/CERU_HUMAN CERU_HUMAN | <StructureSection load='4enz' size='340' side='right'caption='[[4enz]], [[Resolution|resolution]] 2.60Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4enz]] 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=4ENZ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4ENZ 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]] 2.6Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=O:OXYGEN+ATOM'>O</scene>, <scene name='pdbligand=OXY:OXYGEN+MOLECULE'>OXY</scene></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=4enz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4enz OCA], [https://pdbe.org/4enz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4enz RCSB], [https://www.ebi.ac.uk/pdbsum/4enz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4enz ProSAT]</span></td></tr> | |||
</table> | |||
== Disease == | |||
[https://www.uniprot.org/uniprot/CERU_HUMAN CERU_HUMAN] Defects in CP are the cause of aceruloplasminemia (ACERULOP) [MIM:[https://omim.org/entry/604290 604290]. It is an autosomal recessive disorder of iron metabolism characterized by iron accumulation in the brain as well as visceral organs. Clinical features consist of the triad of retinal degeneration, diabetes mellitus and neurological disturbances. Note=Ceruloplasmin levels are decreased in Wilson disease, in which copper cannot be incorporated into ceruloplasmin in liver because of defects in the copper-transporting ATPase 2. | |||
== Function == | |||
[https://www.uniprot.org/uniprot/CERU_HUMAN CERU_HUMAN] Ceruloplasmin is a blue, copper-binding (6-7 atoms per molecule) glycoprotein. It has ferroxidase activity oxidizing Fe(2+) to Fe(3+) without releasing radical oxygen species. It is involved in iron transport across the cell membrane. Provides Cu(2+) ions for the ascorbate-mediated deaminase degradation of the heparan sulfate chains of GPC1. May also play a role in fetal lung development or pulmonary antioxidant defense (By similarity). | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Copper-containing ferroxidase ceruloplasmin (Cp) forms binary and ternary complexes with cationic proteins lactoferrin (Lf) and myeloperoxidase (Mpo) during inflammation. We present an X-ray crystal structure of a 2Cp-Mpo complex at 4.7 A resolution. This structure allows one to identify major protein-protein interaction areas and provides an explanation for a competitive inhibition of Mpo by Cp and for the activation of p-phenylenediamine oxidation by Mpo. Small angle X-ray scattering was employed to construct low-resolution models of the Cp-Lf complex and, for the first time, of the ternary 2Cp-2Lf-Mpo complex in solution. The SAXS-based model of Cp-Lf supports the predicted 1:1 stoichiometry of the complex and demonstrates that both lobes of Lf contact domains 1 and 6 of Cp. The 2Cp-2Lf-Mpo SAXS model reveals the absence of interaction between Mpo and Lf in the ternary complex, so Cp can serve as a mediator of protein interactions in complex architecture. Mpo protects antioxidant properties of Cp by isolating its sensitive loop from proteases. The latter is important for incorporation of Fe(3+) into Lf, which activates ferroxidase activity of Cp and precludes oxidation of Cp substrates. Our models provide the structural basis for possible regulatory role of these complexes in preventing iron-induced oxidative damage. | |||
Ceruloplasmin: macromolecular assemblies with iron-containing acute phase proteins.,Samygina VR, Sokolov AV, Bourenkov G, Petoukhov MV, Pulina MO, Zakharova ET, Vasilyev VB, Bartunik H, Svergun DI PLoS One. 2013 Jul 3;8(7):e67145. doi: 10.1371/journal.pone.0067145. Print 2013. PMID:23843990<ref>PMID:23843990</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 4enz" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
*[[Ceruloplasmin|Ceruloplasmin]] | *[[Ceruloplasmin|Ceruloplasmin]] | ||
== References == | |||
== | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Bartunik | [[Category: Large Structures]] | ||
[[Category: Bourenkov | [[Category: Bartunik H]] | ||
[[Category: Samygina | [[Category: Bourenkov G]] | ||
[[Category: Sokolov | [[Category: Samygina VR]] | ||
[[Category: Vasilyev | [[Category: Sokolov AV]] | ||
[[Category: Vasilyev VB]] | |||