4r14

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Revision as of 19:02, 4 August 2016

Crystal structure of human CSN6 MPN domain

Structural highlights

4r14 is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[CSN6_HUMAN] Component of the COP9 signalosome complex (CSN), a complex involved in various cellular and developmental processes. The CSN complex is an essential regulator of the ubiquitin (Ubl) conjugation pathway by mediating the deneddylation of the cullin subunits of SCF-type E3 ligase complexes, leading to decrease the Ubl ligase activity of SCF-type complexes such as SCF, CSA or DDB2. The complex is also involved in phosphorylation of p53/TP53, c-jun/JUN, IkappaBalpha/NFKBIA, ITPK1 and IRF8, possibly via its association with CK2 and PKD kinases. CSN-dependent phosphorylation of TP53 and JUN promotes and protects degradation by the Ubl system, respectively. Has some glucocorticoid receptor-responsive activity. Stabilizes RFWD2/COP1 through reducing RFWD2 auto-ubiquitination and decelerating RFWD2 turnover rate, hence regulates the ubiquitination of RFWD2 targets.^[1] ^[2] ^[3] ^[4] ^[5] ^[6]

Publication Abstract from PubMed

The mammalian COP9 signalosome is an eight-subunit (CSN1-CSN8) complex that plays essential roles in multiple cellular and physiological processes. CSN5 and CSN6 are the only two MPN (Mpr1-Pad1-N-terminal) domain-containing subunits in the complex. Unlike the CSN5 MPN domain, CSN6 lacks a metal-binding site and isopeptidase activity. Here, we report the crystal structure of the human CSN6 MPN domain. Each CSN6 monomer contains nine beta sheets surrounded by three helices. Two forms of dimers are observed in the crystal structure. Interestingly, a domain swapping of beta8 and beta9 strands occurs between two neighboring monomers to complete a typical MPN fold. Analyses of the pseudo metal-binding motif in CSN6 suggest that the loss of two key histidine residues may contribute to the lack of catalytic activity in CSN6. Comparing the MPN domain of our CSN6 with that in the CSN complex shows that apart from the different beta8-beta9 conformation, they have minor conformational differences at two insertion regions (Ins-1 and Ins-2). Besides, the interacting mode of CSN6-CSN6 in our structure is distinct from that of CSN5-CSN6 in the CSN complex structure. Moreover, the functional implications for Ins-1 and Ins-2 are discussed.

Crystal structure of the human CSN6 MPN domain.,Ma XL, Xu M, Jiang T Biochem Biophys Res Commun. 2014 Sep 19. pii: S0006-291X(14)01662-3. doi:, 10.1016/j.bbrc.2014.09.046. PMID:25242525^[7]

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

References

↑ Seeger M, Kraft R, Ferrell K, Bech-Otschir D, Dumdey R, Schade R, Gordon C, Naumann M, Dubiel W. A novel protein complex involved in signal transduction possessing similarities to 26S proteasome subunits. FASEB J. 1998 Apr;12(6):469-78. PMID:9535219
↑ Bech-Otschir D, Kraft R, Huang X, Henklein P, Kapelari B, Pollmann C, Dubiel W. COP9 signalosome-specific phosphorylation targets p53 to degradation by the ubiquitin system. EMBO J. 2001 Apr 2;20(7):1630-9. PMID:11285227 doi:http://dx.doi.org/10.1093/emboj/20.7.1630
↑ Lyapina S, Cope G, Shevchenko A, Serino G, Tsuge T, Zhou C, Wolf DA, Wei N, Shevchenko A, Deshaies RJ. Promotion of NEDD-CUL1 conjugate cleavage by COP9 signalosome. Science. 2001 May 18;292(5520):1382-5. Epub 2001 May 3. PMID:11337588 doi:http://dx.doi.org/10.1126/science.1059780
↑ Groisman R, Polanowska J, Kuraoka I, Sawada J, Saijo M, Drapkin R, Kisselev AF, Tanaka K, Nakatani Y. The ubiquitin ligase activity in the DDB2 and CSA complexes is differentially regulated by the COP9 signalosome in response to DNA damage. Cell. 2003 May 2;113(3):357-67. PMID:12732143
↑ Uhle S, Medalia O, Waldron R, Dumdey R, Henklein P, Bech-Otschir D, Huang X, Berse M, Sperling J, Schade R, Dubiel W. Protein kinase CK2 and protein kinase D are associated with the COP9 signalosome. EMBO J. 2003 Mar 17;22(6):1302-12. PMID:12628923 doi:http://dx.doi.org/10.1093/emboj/cdg127
↑ Choi HH, Gully C, Su CH, Velazquez-Torres G, Chou PC, Tseng C, Zhao R, Phan L, Shaiken T, Chen J, Yeung SC, Lee MH. COP9 signalosome subunit 6 stabilizes COP1, which functions as an E3 ubiquitin ligase for 14-3-3sigma. Oncogene. 2011 Dec 1;30(48):4791-801. doi: 10.1038/onc.2011.192. Epub 2011 May, 30. PMID:21625211 doi:http://dx.doi.org/10.1038/onc.2011.192
↑ Ma XL, Xu M, Jiang T. Crystal structure of the human CSN6 MPN domain. Biochem Biophys Res Commun. 2014 Sep 19. pii: S0006-291X(14)01662-3. doi:, 10.1016/j.bbrc.2014.09.046. PMID:25242525 doi:http://dx.doi.org/10.1016/j.bbrc.2014.09.046

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4r14"

@@ Line 1: / Line 1: @@
 ==Crystal structure of human CSN6 MPN domain==
 <StructureSection load='4r14' size='340' side='right' caption='[[4r14]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
@@ Line 4: / Line 5: @@
 <table><tr><td colspan='2'>[[4r14]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4R14 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4R14 FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HG:MERCURY+(II)+ION'>HG</scene></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=4r14 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4r14 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4r14 RCSB], [http://www.ebi.ac.uk/pdbsum/4r14 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=4r14 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4r14 OCA], [http://pdbe.org/4r14 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4r14 RCSB], [http://www.ebi.ac.uk/pdbsum/4r14 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4r14 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 16: / Line 17: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4r14" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Signalosome|Signalosome]]
 == References ==
 <references/>

4r14

From Proteopedia

Revision as of 19:02, 4 August 2016

Crystal structure of human CSN6 MPN domain

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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