3o8e

From Proteopedia

(Difference between revisions)

Revision as of 20:04, 5 August 2016

Structure of extracelllar portion of CD46 in complex with Adenovirus type 11 knob

Structural highlights

3o8e is a 4 chain structure with sequence from Human and Human adenovirus 11. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Gene:	CD46, MCP, MIC10 (Human adenovirus 11)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

[MCP_HUMAN] Defects in CD46 are a cause of susceptibility to hemolytic uremic syndrome atypical type 2 (AHUS2) [MIM:612922]. An atypical form of hemolytic uremic syndrome. It is a complex genetic disease characterized by microangiopathic hemolytic anemia, thrombocytopenia, renal failure and absence of episodes of enterocolitis and diarrhea. In contrast to typical hemolytic uremic syndrome, atypical forms have a poorer prognosis, with higher death rates and frequent progression to end-stage renal disease. Note=Susceptibility to the development of atypical hemolytic uremic syndrome can be conferred by mutations in various components of or regulatory factors in the complement cascade system. Other genes may play a role in modifying the phenotype. Patients with CD46 mutations seem to have an overall better prognosis compared to patients carrying CFH mutations.^[1] ^[2] ^[3] ^[4] ^[5]

Function

[MCP_HUMAN] Acts as a cofactor for complement factor I, a serine protease which protects autologous cells against complement-mediated injury by cleaving C3b and C4b deposited on host tissue. May be involved in the fusion of the spermatozoa with the oocyte during fertilization. Also acts as a costimulatory factor for T-cells which induces the differentiation of CD4+ into T-regulatory 1 cells. T-regulatory 1 cells suppress immune responses by secreting interleukin-10, and therefore are thought to prevent autoimmunity. A number of viral and bacterial pathogens seem to exploit this property and directly induce an immunosuppressive phenotype in T-cells by binding to CD46.^[6] ^[7]

Publication Abstract from PubMed

The human membrane cofactor protein (MCP, CD46) is a central component of the innate immune system. CD46 protects autologous cells from complement attack by binding to complement proteins C3b and C4b and serving as a cofactor for their cleavage. Recent data show that CD46 also plays a role in mediating acquired immune responses, and in triggering autophagy. In addition to these physiologic functions, a significant number of pathogens, including select adenoviruses, measles virus, human herpes virus 6 (HHV-6), Streptococci, and Neisseria, use CD46 as a cell attachment receptor. We have determined the crystal structure of the extracellular region of CD46 in complex with the human adenovirus type 11 fiber knob. Extracellular CD46 comprises four short consensus repeats (SCR1-SCR4) that form an elongated structure resembling a hockey stick, with a long shaft and a short blade. Domains SCR1, SCR2 and SCR3 are arranged in a nearly linear fashion. Unexpectedly, however, the structure reveals a profound bend between domains SCR3 and SCR4, which has implications for the interactions with ligands as well as the orientation of the protein at the cell surface. This bend can be attributed to an insertion of five hydrophobic residues in a SCR3 surface loop. Residues in this loop have been implicated in interactions with complement, indicating that the bend participates in binding to C3b and C4b. The structure provides an accurate framework for mapping all known ligand binding sites onto the surface of CD46, thereby advancing an understanding of how CD46 acts as a receptor for pathogens and physiologic ligands of the immune system.

Structure of the extracellular portion of CD46 provides insights into its interactions with complement proteins and pathogens.,Persson BD, Schmitz NB, Santiago C, Zocher G, Larvie M, Scheu U, Casasnovas JM, Stehle T PLoS Pathog. 2010 Sep 30;6(9). pii: e1001122. PMID:20941397^[8]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Noris M, Brioschi S, Caprioli J, Todeschini M, Bresin E, Porrati F, Gamba S, Remuzzi G. Familial haemolytic uraemic syndrome and an MCP mutation. Lancet. 2003 Nov 8;362(9395):1542-7. PMID:14615110 doi:10.1016/S0140-6736(03)14742-3
↑ Richards A, Kemp EJ, Liszewski MK, Goodship JA, Lampe AK, Decorte R, Muslumanoglu MH, Kavukcu S, Filler G, Pirson Y, Wen LS, Atkinson JP, Goodship TH. Mutations in human complement regulator, membrane cofactor protein (CD46), predispose to development of familial hemolytic uremic syndrome. Proc Natl Acad Sci U S A. 2003 Oct 28;100(22):12966-71. Epub 2003 Oct 17. PMID:14566051 doi:10.1073/pnas.2135497100
↑ Caprioli J, Noris M, Brioschi S, Pianetti G, Castelletti F, Bettinaglio P, Mele C, Bresin E, Cassis L, Gamba S, Porrati F, Bucchioni S, Monteferrante G, Fang CJ, Liszewski MK, Kavanagh D, Atkinson JP, Remuzzi G. Genetics of HUS: the impact of MCP, CFH, and IF mutations on clinical presentation, response to treatment, and outcome. Blood. 2006 Aug 15;108(4):1267-79. Epub 2006 Apr 18. PMID:16621965 doi:10.1182/blood-2005-10-007252
↑ Esparza-Gordillo J, Jorge EG, Garrido CA, Carreras L, Lopez-Trascasa M, Sanchez-Corral P, de Cordoba SR. Insights into hemolytic uremic syndrome: segregation of three independent predisposition factors in a large, multiple affected pedigree. Mol Immunol. 2006 Apr;43(11):1769-75. Epub 2006 Jan 18. PMID:16386793 doi:10.1016/j.molimm.2005.11.008
↑ Maga TK, Nishimura CJ, Weaver AE, Frees KL, Smith RJ. Mutations in alternative pathway complement proteins in American patients with atypical hemolytic uremic syndrome. Hum Mutat. 2010 Jun;31(6):E1445-60. doi: 10.1002/humu.21256. PMID:20513133 doi:10.1002/humu.21256
↑ Astier A, Trescol-Biemont MC, Azocar O, Lamouille B, Rabourdin-Combe C. Cutting edge: CD46, a new costimulatory molecule for T cells, that induces p120CBL and LAT phosphorylation. J Immunol. 2000 Jun 15;164(12):6091-5. PMID:10843656
↑ Kemper C, Chan AC, Green JM, Brett KA, Murphy KM, Atkinson JP. Activation of human CD4+ cells with CD3 and CD46 induces a T-regulatory cell 1 phenotype. Nature. 2003 Jan 23;421(6921):388-92. PMID:12540904 doi:10.1038/nature01315
↑ Persson BD, Schmitz NB, Santiago C, Zocher G, Larvie M, Scheu U, Casasnovas JM, Stehle T. Structure of the extracellular portion of CD46 provides insights into its interactions with complement proteins and pathogens. PLoS Pathog. 2010 Sep 30;6(9). pii: e1001122. PMID:20941397 doi:10.1371/journal.ppat.1001122

1 Structural highlights
2 Disease
3 Function
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3o8e"

@@ Line 1: / Line 1: @@
 ==Structure of extracelllar portion of CD46 in complex with Adenovirus type 11 knob==
 <StructureSection load='3o8e' size='340' side='right' caption='[[3o8e]], [[Resolution|resolution]] 2.84&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[3o8e]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Human_adenovirus_11 Human adenovirus 11]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3O8E OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3O8E FirstGlance]. <br>
+<table><tr><td colspan='2'>[[3o8e]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Human_adenovirus_11 Human adenovirus 11]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3O8E OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3O8E FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=DTD:DITHIANE+DIOL'>DTD</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CD46, MCP, MIC10 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10541 Human adenovirus 11])</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=3o8e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3o8e OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3o8e RCSB], [http://www.ebi.ac.uk/pdbsum/3o8e PDBsum]</span></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=3o8e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3o8e OCA], [http://pdbe.org/3o8e PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3o8e RCSB], [http://www.ebi.ac.uk/pdbsum/3o8e PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3o8e ProSAT]</span></td></tr>
 </table>
 == Disease ==
@@ Line 19: / Line 20: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 3o8e" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Homo sapiens]]
+[[Category: Human]]
 [[Category: Human adenovirus 11]]
 [[Category: Casasnovas, J M]]

3o8e

From Proteopedia

Revision as of 20:04, 5 August 2016

Structure of extracelllar portion of CD46 in complex with Adenovirus type 11 knob

Structural highlights

Disease

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox