2lxp

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{{STRUCTURE_2lxp| PDB=2lxp | SCENE= }}
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==NMR structure of two domains in ubiquitin ligase gp78, RING and G2BR, bound to its conjugating enzyme Ube2g==
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===NMR structure of two domains in ubiquitin ligase gp78, RING and G2BR, bound to its conjugating enzyme Ube2g===
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<StructureSection load='2lxp' size='340' side='right' caption='[[2lxp]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
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{{ABSTRACT_PUBMED_23942235}}
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== Structural highlights ==
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<table><tr><td colspan='2'>[[2lxp]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Ochroconis_lascauxensis Ochroconis lascauxensis]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2LXP OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2LXP FirstGlance]. <br>
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==Function==
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">UBE2G2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=994323 Ochroconis lascauxensis]), AMFR, RNF45 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</td></tr>
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<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Ubiquitin--protein_ligase Ubiquitin--protein ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.3.2.19 6.3.2.19] </span></td></tr>
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<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=2lxp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2lxp OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2lxp RCSB], [http://www.ebi.ac.uk/pdbsum/2lxp PDBsum]</span></td></tr>
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</table>
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== Function ==
[[http://www.uniprot.org/uniprot/UB2G2_HUMAN UB2G2_HUMAN]] Accepts ubiquitin from the E1 complex and catalyzes its covalent attachment to other proteins. In vitro catalyzes 'Lys-48'-linked polyubiquitination. Involved in endoplasmic reticulum-associated degradation (ERAD).<ref>PMID:20061386</ref> <ref>PMID:22607976</ref> [[http://www.uniprot.org/uniprot/AMFR_HUMAN AMFR_HUMAN]] E3 ubiquitin-protein ligase that mediates the polyubiquitination of a number of proteins such as CD3D, CYP3A4, CFTR and APOB for proteasomal degradation. Component of a VCP/p97-AMFR/gp78 complex that participates in the final step of endoplasmic reticulum-associated degradation (ERAD). The VCP/p97-AMFR/gp78 complex is involved in the sterol-accelerated ERAD degradation of HMGCR through binding to the HMGCR-INSIG complex at the ER membrane and initiating ubiquitination of HMGCR. The ubiquitinated HMGCR is then released from the ER by the complex into the cytosol for subsequent destruction. Also acts as a scaffold protein to assemble a complex that couples ubiquitination, retranslocation and deglycosylation. Mediates tumor invasion and metastasis as a receptor for the GPI/autocrine motility factor.<ref>PMID:10456327</ref> <ref>PMID:11724934</ref> <ref>PMID:16168377</ref> <ref>PMID:19103148</ref>
[[http://www.uniprot.org/uniprot/UB2G2_HUMAN UB2G2_HUMAN]] Accepts ubiquitin from the E1 complex and catalyzes its covalent attachment to other proteins. In vitro catalyzes 'Lys-48'-linked polyubiquitination. Involved in endoplasmic reticulum-associated degradation (ERAD).<ref>PMID:20061386</ref> <ref>PMID:22607976</ref> [[http://www.uniprot.org/uniprot/AMFR_HUMAN AMFR_HUMAN]] E3 ubiquitin-protein ligase that mediates the polyubiquitination of a number of proteins such as CD3D, CYP3A4, CFTR and APOB for proteasomal degradation. Component of a VCP/p97-AMFR/gp78 complex that participates in the final step of endoplasmic reticulum-associated degradation (ERAD). The VCP/p97-AMFR/gp78 complex is involved in the sterol-accelerated ERAD degradation of HMGCR through binding to the HMGCR-INSIG complex at the ER membrane and initiating ubiquitination of HMGCR. The ubiquitinated HMGCR is then released from the ER by the complex into the cytosol for subsequent destruction. Also acts as a scaffold protein to assemble a complex that couples ubiquitination, retranslocation and deglycosylation. Mediates tumor invasion and metastasis as a receptor for the GPI/autocrine motility factor.<ref>PMID:10456327</ref> <ref>PMID:11724934</ref> <ref>PMID:16168377</ref> <ref>PMID:19103148</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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RING finger proteins constitute the large majority of ubiquitin ligases (E3s) and function by interacting with ubiquitin-conjugating enzymes (E2s) charged with ubiquitin. How low-affinity RING-E2 interactions result in highly processive substrate ubiquitination is largely unknown. The RING E3, gp78, represents an excellent model to study this process. gp78 includes a high-affinity secondary binding region for its cognate E2, Ube2g2, the G2BR. The G2BR allosterically enhances RING:Ube2g2 binding and ubiquitination. Structural analysis of the RING:Ube2g2:G2BR complex reveals that a G2BR-induced conformational effect at the RING:Ube2g2 interface is necessary for enhanced binding of RING to Ube2g2 or Ube2g2 conjugated to Ub. This conformational effect and a key ternary interaction with conjugated ubiquitin are required for ubiquitin transfer. Moreover, RING:Ube2g2 binding induces a second allosteric effect, disrupting Ube2g2:G2BR contacts, decreasing affinity and facilitating E2 exchange. Thus, gp78 is a ubiquitination machine where multiple E2-binding sites coordinately facilitate processive ubiquitination.
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Allosteric regulation of E2:E3 interactions promote a processive ubiquitination machine.,Das R, Liang YH, Mariano J, Li J, Huang T, King A, Tarasov SG, Weissman AM, Ji X, Byrd RA EMBO J. 2013 Aug 13. doi: 10.1038/emboj.2013.174. PMID:23942235<ref>PMID:23942235</ref>
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==About this Structure==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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[[2lxp]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Ochroconis_lascauxensis Ochroconis lascauxensis]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2LXP OCA].
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</div>
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==Reference==
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==See Also==
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<ref group="xtra">PMID:023942235</ref><references group="xtra"/><references/>
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*[[Ubiquitin conjugating enzyme|Ubiquitin conjugating enzyme]]
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*[[Ubiquitin protein ligase|Ubiquitin protein ligase]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Ochroconis lascauxensis]]
[[Category: Ochroconis lascauxensis]]
[[Category: Ubiquitin--protein ligase]]
[[Category: Ubiquitin--protein ligase]]
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[[Category: Byrd, R.]]
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[[Category: Byrd, R]]
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[[Category: Das, R.]]
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[[Category: Das, R]]
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[[Category: Huang, T.]]
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[[Category: Huang, T]]
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[[Category: Ji, X.]]
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[[Category: Ji, X]]
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[[Category: King, A.]]
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[[Category: King, A]]
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[[Category: Li, J.]]
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[[Category: Li, J]]
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[[Category: Linag, Y.]]
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[[Category: Linag, Y]]
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[[Category: Mariano, J.]]
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[[Category: Mariano, J]]
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[[Category: Weissman, A.]]
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[[Category: Weissman, A]]
[[Category: Ligase]]
[[Category: Ligase]]
[[Category: Ring domain]]
[[Category: Ring domain]]
[[Category: Ubiquitin]]
[[Category: Ubiquitin]]

Revision as of 15:47, 25 December 2014

NMR structure of two domains in ubiquitin ligase gp78, RING and G2BR, bound to its conjugating enzyme Ube2g

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