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==Solution structure of the Rpn1 T1 site with K48-linked diubiquitin in the extended binding mode==
==Solution structure of the Rpn1 T1 site with K48-linked diubiquitin in the extended binding mode==
<StructureSection load='2n3v' size='340' side='right' caption='[[2n3v]], [[NMR_Ensembles_of_Models | 10 NMR models]]' scene=''>
<StructureSection load='2n3v' size='340' side='right'caption='[[2n3v]]' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[2n3v]] is a 3 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2N3V OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2N3V FirstGlance]. <br>
<table><tr><td colspan='2'>[[2n3v]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae_S288C Saccharomyces cerevisiae S288C]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2N3V OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2N3V FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2n3t|2n3t]], [[2n3u|2n3u]], [[2n3w|2n3w]]</td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 10 models</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=2n3v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2n3v OCA], [http://pdbe.org/2n3v PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2n3v RCSB], [http://www.ebi.ac.uk/pdbsum/2n3v 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=2n3v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2n3v OCA], [https://pdbe.org/2n3v PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2n3v RCSB], [https://www.ebi.ac.uk/pdbsum/2n3v PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2n3v ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/RPN1_YEAST RPN1_YEAST]] Acts as a regulatory subunit of the 26S proteasome which is involved in the ATP-dependent degradation of ubiquitinated proteins.<ref>PMID:9584156</ref> [[http://www.uniprot.org/uniprot/RL40_HUMAN RL40_HUMAN]] Ubiquitin exists either covalently attached to another protein, or free (unanchored). When covalently bound, it is conjugated to target proteins via an isopeptide bond either as a monomer (monoubiquitin), a polymer linked via different Lys residues of the ubiquitin (polyubiquitin chains) or a linear polymer linked via the initiator Met of the ubiquitin (linear polyubiquitin chains). Polyubiquitin chains, when attached to a target protein, have different functions depending on the Lys residue of the ubiquitin that is linked: Lys-6-linked may be involved in DNA repair; Lys-11-linked is involved in ERAD (endoplasmic reticulum-associated degradation) and in cell-cycle regulation; Lys-29-linked is involved in lysosomal degradation; Lys-33-linked is involved in kinase modification; Lys-48-linked is involved in protein degradation via the proteasome; Lys-63-linked is involved in endocytosis, DNA-damage responses as well as in signaling processes leading to activation of the transcription factor NF-kappa-B. Linear polymer chains formed via attachment by the initiator Met lead to cell signaling. Ubiquitin is usually conjugated to Lys residues of target proteins, however, in rare cases, conjugation to Cys or Ser residues has been observed. When polyubiquitin is free (unanchored-polyubiquitin), it also has distinct roles, such as in activation of protein kinases, and in signaling.<ref>PMID:16543144</ref> <ref>PMID:19754430</ref>   Ribosomal protein L40 is a component of the 60S subunit of the ribosome.<ref>PMID:16543144</ref> <ref>PMID:19754430</ref>
[https://www.uniprot.org/uniprot/RPN1_YEAST RPN1_YEAST] Acts as a regulatory subunit of the 26S proteasome which is involved in the ATP-dependent degradation of ubiquitinated proteins.<ref>PMID:9584156</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Hundreds of pathways for degradation converge at ubiquitin recognition by a proteasome. Here, we found that the five known proteasomal ubiquitin receptors in yeast are collectively nonessential for ubiquitin recognition and identified a sixth receptor, Rpn1. A site ( T1: ) in the Rpn1 toroid recognized ubiquitin and ubiquitin-like ( UBL: ) domains of substrate shuttling factors. T1 structures with monoubiquitin or lysine 48 diubiquitin show three neighboring outer helices engaging two ubiquitins. T1 contributes a distinct substrate-binding pathway with preference for lysine 48-linked chains. Proximal to T1 within the Rpn1 toroid is a second UBL-binding site ( T2: ) that assists in ubiquitin chain disassembly, by binding the UBL of deubiquitinating enzyme Ubp6. Thus, a two-site recognition domain intrinsic to the proteasome uses distinct ubiquitin-fold ligands to assemble substrates, shuttling factors, and a deubiquitinating enzyme.
 
Rpn1 provides adjacent receptor sites for substrate binding and deubiquitination by the proteasome.,Shi Y, Chen X, Elsasser S, Stocks BB, Tian G, Lee BH, Shi Y, Zhang N, de Poot SA, Tuebing F, Sun S, Vannoy J, Tarasov SG, Engen JR, Finley D, Walters KJ Science. 2016 Feb 19;351(6275). pii: aad9421. doi: 10.1126/science.aad9421. PMID:26912900<ref>PMID:26912900</ref>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2n3v" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Chen, X]]
[[Category: Homo sapiens]]
[[Category: Walters, K J]]
[[Category: Large Structures]]
[[Category: Protein binding]]
[[Category: Saccharomyces cerevisiae S288C]]
[[Category: Chen X]]
[[Category: Walters KJ]]

Latest revision as of 12:20, 6 November 2024

Solution structure of the Rpn1 T1 site with K48-linked diubiquitin in the extended binding modeSolution structure of the Rpn1 T1 site with K48-linked diubiquitin in the extended binding mode

Structural highlights

2n3v is a 3 chain structure with sequence from Homo sapiens and Saccharomyces cerevisiae S288C. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Solution NMR, 10 models
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

RPN1_YEAST Acts as a regulatory subunit of the 26S proteasome which is involved in the ATP-dependent degradation of ubiquitinated proteins.[1]

Publication Abstract from PubMed

Hundreds of pathways for degradation converge at ubiquitin recognition by a proteasome. Here, we found that the five known proteasomal ubiquitin receptors in yeast are collectively nonessential for ubiquitin recognition and identified a sixth receptor, Rpn1. A site ( T1: ) in the Rpn1 toroid recognized ubiquitin and ubiquitin-like ( UBL: ) domains of substrate shuttling factors. T1 structures with monoubiquitin or lysine 48 diubiquitin show three neighboring outer helices engaging two ubiquitins. T1 contributes a distinct substrate-binding pathway with preference for lysine 48-linked chains. Proximal to T1 within the Rpn1 toroid is a second UBL-binding site ( T2: ) that assists in ubiquitin chain disassembly, by binding the UBL of deubiquitinating enzyme Ubp6. Thus, a two-site recognition domain intrinsic to the proteasome uses distinct ubiquitin-fold ligands to assemble substrates, shuttling factors, and a deubiquitinating enzyme.

Rpn1 provides adjacent receptor sites for substrate binding and deubiquitination by the proteasome.,Shi Y, Chen X, Elsasser S, Stocks BB, Tian G, Lee BH, Shi Y, Zhang N, de Poot SA, Tuebing F, Sun S, Vannoy J, Tarasov SG, Engen JR, Finley D, Walters KJ Science. 2016 Feb 19;351(6275). pii: aad9421. doi: 10.1126/science.aad9421. PMID:26912900[2]

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

References

  1. ↑ Glickman MH, Rubin DM, Fried VA, Finley D. The regulatory particle of the Saccharomyces cerevisiae proteasome. Mol Cell Biol. 1998 Jun;18(6):3149-62. PMID:9584156
  2. ↑ Shi Y, Chen X, Elsasser S, Stocks BB, Tian G, Lee BH, Shi Y, Zhang N, de Poot SA, Tuebing F, Sun S, Vannoy J, Tarasov SG, Engen JR, Finley D, Walters KJ. Rpn1 provides adjacent receptor sites for substrate binding and deubiquitination by the proteasome. Science. 2016 Feb 19;351(6275). pii: aad9421. doi: 10.1126/science.aad9421. PMID:26912900 doi:http://dx.doi.org/10.1126/science.aad9421
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