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| | ==Crystal structure of human proteasome alpha7 tetradecamer== | | ==Crystal structure of human proteasome alpha7 tetradecamer== |
| - | <StructureSection load='5dsv' size='340' side='right' caption='[[5dsv]], [[Resolution|resolution]] 3.75Å' scene=''> | + | <StructureSection load='5dsv' size='340' side='right'caption='[[5dsv]], [[Resolution|resolution]] 3.75Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5dsv]] is a 14 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5DSV OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5DSV FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5dsv]] is a 14 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=5DSV OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5DSV FirstGlance]. <br> |
| - | </td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Proteasome_endopeptidase_complex Proteasome endopeptidase complex], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.25.1 3.4.25.1] </span></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.75Å</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=5dsv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5dsv OCA], [http://pdbe.org/5dsv PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5dsv RCSB], [http://www.ebi.ac.uk/pdbsum/5dsv PDBsum]</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=5dsv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5dsv OCA], [https://pdbe.org/5dsv PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5dsv RCSB], [https://www.ebi.ac.uk/pdbsum/5dsv PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5dsv ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/PSA3_HUMAN PSA3_HUMAN]] The proteasome is a multicatalytic proteinase complex which is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. The proteasome has an ATP-dependent proteolytic activity. Binds to the C-terminus of CDKN1A and thereby mediates its degradation. Negatively regulates the membrane trafficking of the cell-surface thromboxane A2 receptor (TBXA2R) isoform 2.<ref>PMID:11350925</ref> <ref>PMID:17499743</ref> | + | [https://www.uniprot.org/uniprot/PSA3_HUMAN PSA3_HUMAN] The proteasome is a multicatalytic proteinase complex which is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. The proteasome has an ATP-dependent proteolytic activity. Binds to the C-terminus of CDKN1A and thereby mediates its degradation. Negatively regulates the membrane trafficking of the cell-surface thromboxane A2 receptor (TBXA2R) isoform 2.<ref>PMID:11350925</ref> <ref>PMID:17499743</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </div> | | </div> |
| | <div class="pdbe-citations 5dsv" style="background-color:#fffaf0;"></div> | | <div class="pdbe-citations 5dsv" style="background-color:#fffaf0;"></div> |
| | + | |
| | + | ==See Also== |
| | + | *[[Proteasome 3D structures|Proteasome 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Proteasome endopeptidase complex]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Kato, K]] | + | [[Category: Large Structures]] |
| - | [[Category: Satoh, T]] | + | [[Category: Kato K]] |
| - | [[Category: Seetaha, S]] | + | [[Category: Satoh T]] |
| - | [[Category: Thammaporn, R]] | + | [[Category: Seetaha S]] |
| - | [[Category: Hydrolase]]
| + | [[Category: Thammaporn R]] |
| - | [[Category: Proteasome]]
| + | |
| Structural highlights
Function
PSA3_HUMAN The proteasome is a multicatalytic proteinase complex which is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. The proteasome has an ATP-dependent proteolytic activity. Binds to the C-terminus of CDKN1A and thereby mediates its degradation. Negatively regulates the membrane trafficking of the cell-surface thromboxane A2 receptor (TBXA2R) isoform 2.[1] [2]
Publication Abstract from PubMed
The 20S core particle of the eukaryotic proteasome is composed of two alpha- and two beta-rings, each of which is a hetero-heptamer composed of seven homologous but distinct subunits. Although formation of the eukaryotic proteasome is a highly ordered process assisted by assembly chaperones, alpha7, an alpha-ring component, has the unique property of self-assembling into a homo-tetradecamer. We used biophysical methods to characterize the oligomeric states of this proteasome subunit and its interaction with alpha6, which makes direct contacts with alpha7 in the proteasome alpha-ring. We determined a crystal structure of the alpha7 tetradecamer, which has a double-ring structure. Sedimentation velocity analytical ultracentrifugation and mass spectrometric analysis under non-denaturing conditions revealed that alpha7 exclusively exists as homo-tetradecamer in solution and that its double-ring structure is disassembled upon the addition of alpha6, resulting in a 1:7 hetero-octameric alpha6-alpha7 complex. Our findings suggest that proteasome formation involves the disassembly of non-native oligomers, which are assembly intermediates.
Disassembly of the self-assembled, double-ring structure of proteasome alpha7 homo-tetradecamer by alpha6.,Ishii K, Noda M, Yagi H, Thammaporn R, Seetaha S, Satoh T, Kato K, Uchiyama S Sci Rep. 2015 Dec 14;5:18167. doi: 10.1038/srep18167. PMID:26657688[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Touitou R, Richardson J, Bose S, Nakanishi M, Rivett J, Allday MJ. A degradation signal located in the C-terminus of p21WAF1/CIP1 is a binding site for the C8 alpha-subunit of the 20S proteasome. EMBO J. 2001 May 15;20(10):2367-75. PMID:11350925 doi:http://dx.doi.org/10.1093/emboj/20.10.2367
- ↑ Sasaki M, Sukegawa J, Miyosawa K, Yanagisawa T, Ohkubo S, Nakahata N. Low expression of cell-surface thromboxane A2 receptor beta-isoform through the negative regulation of its membrane traffic by proteasomes. Prostaglandins Other Lipid Mediat. 2007 Jun;83(4):237-49. Epub 2006 Dec 27. PMID:17499743 doi:http://dx.doi.org/10.1016/j.prostaglandins.2006.12.001
- ↑ Ishii K, Noda M, Yagi H, Thammaporn R, Seetaha S, Satoh T, Kato K, Uchiyama S. Disassembly of the self-assembled, double-ring structure of proteasome alpha7 homo-tetradecamer by alpha6. Sci Rep. 2015 Dec 14;5:18167. doi: 10.1038/srep18167. PMID:26657688 doi:http://dx.doi.org/10.1038/srep18167
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