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| | ==Complement component C2a== | | ==Complement component C2a== |
| - | <StructureSection load='2i6q' size='340' side='right' caption='[[2i6q]], [[Resolution|resolution]] 2.10Å' scene=''> | + | <StructureSection load='2i6q' size='340' side='right'caption='[[2i6q]], [[Resolution|resolution]] 2.10Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2i6q]] 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=2I6Q OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2I6Q FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2i6q]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2I6Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2I6Q 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=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=MLI:MALONATE+ION'>MLI</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=MLI:MALONATE+ION'>MLI</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2i6s|2i6s]]</td></tr> | + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2i6s|2i6s]]</div></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">C2a ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">C2a ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Classical-complement-pathway_C3/C5_convertase Classical-complement-pathway C3/C5 convertase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.43 3.4.21.43] </span></td></tr> | + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Classical-complement-pathway_C3/C5_convertase Classical-complement-pathway C3/C5 convertase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.43 3.4.21.43] </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=2i6q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2i6q OCA], [http://pdbe.org/2i6q PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2i6q RCSB], [http://www.ebi.ac.uk/pdbsum/2i6q PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2i6q ProSAT]</span></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=2i6q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2i6q OCA], [https://pdbe.org/2i6q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2i6q RCSB], [https://www.ebi.ac.uk/pdbsum/2i6q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2i6q ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Disease == | | == Disease == |
| - | [[http://www.uniprot.org/uniprot/CO2_HUMAN CO2_HUMAN]] Defects in C2 are the cause of complement component 2 deficiency (C2D) [MIM:[http://omim.org/entry/217000 217000]]. A deficiency of the complement classical pathway associated with the development of autoimmune disorders, mainly systemic lupus erythematosus. Skin and joint manifestations are common and renal disease is relatively rare. Patients with complement component 2 deficiency are also reported to have recurrent or invasive infections.<ref>PMID:8621452</ref> <ref>PMID:9670930</ref> | + | [[https://www.uniprot.org/uniprot/CO2_HUMAN CO2_HUMAN]] Defects in C2 are the cause of complement component 2 deficiency (C2D) [MIM:[https://omim.org/entry/217000 217000]]. A deficiency of the complement classical pathway associated with the development of autoimmune disorders, mainly systemic lupus erythematosus. Skin and joint manifestations are common and renal disease is relatively rare. Patients with complement component 2 deficiency are also reported to have recurrent or invasive infections.<ref>PMID:8621452</ref> <ref>PMID:9670930</ref> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/CO2_HUMAN CO2_HUMAN]] Component C2 which is part of the classical pathway of the complement system is cleaved by activated factor C1 into two fragments: C2b and C2a. C2a, a serine protease, then combines with complement factor 4b to generate the C3 or C5 convertase. | + | [[https://www.uniprot.org/uniprot/CO2_HUMAN CO2_HUMAN]] Component C2 which is part of the classical pathway of the complement system is cleaved by activated factor C1 into two fragments: C2b and C2a. C2a, a serine protease, then combines with complement factor 4b to generate the C3 or C5 convertase. |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | [[Category: Classical-complement-pathway C3/C5 convertase]] | | [[Category: Classical-complement-pathway C3/C5 convertase]] |
| | [[Category: Human]] | | [[Category: Human]] |
| | + | [[Category: Large Structures]] |
| | [[Category: Daha, M R]] | | [[Category: Daha, M R]] |
| | [[Category: Gros, P]] | | [[Category: Gros, P]] |
| Structural highlights
2i6q is a 1 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Ligands: | , , , , |
| Related: | |
| Gene: | C2a (HUMAN) |
| Activity: | Classical-complement-pathway C3/C5 convertase, with EC number 3.4.21.43 |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Disease
[CO2_HUMAN] Defects in C2 are the cause of complement component 2 deficiency (C2D) [MIM:217000]. A deficiency of the complement classical pathway associated with the development of autoimmune disorders, mainly systemic lupus erythematosus. Skin and joint manifestations are common and renal disease is relatively rare. Patients with complement component 2 deficiency are also reported to have recurrent or invasive infections.[1] [2]
Function
[CO2_HUMAN] Component C2 which is part of the classical pathway of the complement system is cleaved by activated factor C1 into two fragments: C2b and C2a. C2a, a serine protease, then combines with complement factor 4b to generate the C3 or C5 convertase.
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
C2a provides the catalytic center to the convertase complexes of the classical and lectin-binding pathways of complement activation. We determined two crystal structures of full-length C2a, with and without a pseudo ligand bound. Both structures reveal a near-active conformation of the catalytic center of the serine protease domains, while the von Willebrand factor A-type domains display an intermediate activation state of helix alpha7 with an open, activated metal-ion-dependent adhesion site. The open adhesion site likely serves to enhance the affinity for the ligand C4b, similar to "inside-out" signaling in integrins. Surprisingly, the N-terminal residues of C2a are buried in a crevice near helix alpha7, indicative of a structural switch between C2 and C2a. Extended loops on the protease domain possibly envelop the protruding anaphylatoxin domain of the substrate C3. Together with a putative substrate-induced completion of the oxyanion hole, this may contribute to the high substrate specificity of the convertases.
Structure of complement component C2A: implications for convertase formation and substrate binding.,Milder FJ, Raaijmakers HC, Vandeputte MD, Schouten A, Huizinga EG, Romijn RA, Hemrika W, Roos A, Daha MR, Gros P Structure. 2006 Oct;14(10):1587-97. PMID:17027507[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Wetsel RA, Kulics J, Lokki ML, Kiepiela P, Akama H, Johnson CA, Densen P, Colten HR. Type II human complement C2 deficiency. Allele-specific amino acid substitutions (Ser189 --> Phe; Gly444 --> Arg) cause impaired C2 secretion. J Biol Chem. 1996 Mar 8;271(10):5824-31. PMID:8621452
- ↑ Zhu ZB, Atkinson TP, Volanakis JE. A novel type II complement C2 deficiency allele in an African-American family. J Immunol. 1998 Jul 15;161(2):578-84. PMID:9670930
- ↑ Milder FJ, Raaijmakers HC, Vandeputte MD, Schouten A, Huizinga EG, Romijn RA, Hemrika W, Roos A, Daha MR, Gros P. Structure of complement component C2A: implications for convertase formation and substrate binding. Structure. 2006 Oct;14(10):1587-97. PMID:17027507 doi:http://dx.doi.org/10.1016/j.str.2006.08.008
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