Ubiquitin

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<StructureSection load='' size='340' side='right' caption='Human ubiquitin (green) complex with ubiquitin-conjugating enzyme E2 (deep sky blue), [[3k9p]]' scene='41/417541/Cv/3' >
<StructureSection load='' size='340' side='right' caption='Human ubiquitin (green) complex with ubiquitin-conjugating enzyme E2 (deep sky blue), [[3k9p]]' scene='41/417541/Cv/3' >
== Function ==
== Function ==
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[[Ubiquitin]] (UBB) is found in almost all cells. It binds to proteins tagging them for destruction in the proteasome. UBB is activated by the UBB-activating enzymes E1, E2 and E3. UBB+1 is a frameshifted mutant of UBB observed in several diseases. A dimer of UBB (DiUBB) is formed by linkage of K48 to the C-terminus of a second UBB molecule. At least 4 UBB molecules are needed to tag a protein for the proteasome<ref>PMID:9759494</ref>. <scene name='41/417541/Cv/4'>Human ubiquitin interactions with ubiquitin-conjugating enzyme E2</scene> ([[3k9p]]). For details see<br />
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[[Ubiquitin]] (UBB) is found in almost all cells. It binds to proteins tagging them for destruction in the proteasome. UBB is activated by the UBB-activating enzymes E1, E2 and E3. '''Ubiquitin+1''' is a frameshifted mutant of UBB observed in several diseases. A dimer of UBB (DiUBB) is formed by linkage of K48 to the C-terminus of a second UBB molecule. '''Polyubiquitin''' (polyUBB) is a chain of ubiquitin molecules bound by peptide bonds. PolyUBB can be formed by lysine residues: K6, K11, K27, 29, K33, K48, and K63. Different lysine linkages convey different functions to polyUBB. Lys48- linked polyUBB and LYs11-linked polyUBB are associated with proteasome degradation; Lys63-linked and Lys-6 polyUBB are associated with non-proteolytic functions<ref>PMID:18438605</ref>. At least 4 UBB molecules are needed to tag a protein for the proteasome<ref>PMID:9759494</ref>. <scene name='41/417541/Cv/4'>Human ubiquitin interactions with ubiquitin-conjugating enzyme E2</scene> ([[3k9p]]). For details see<br />
* [[Ubiquitin Structure & Function]]<br />
* [[Ubiquitin Structure & Function]]<br />
 +
* [[Ubiquitin and Ubiquitination]]<br />
* [[Ubiquitin salt bridge discussion]]<br />
* [[Ubiquitin salt bridge discussion]]<br />
* [[Ubiquitin chains]].
* [[Ubiquitin chains]].
 +
 +
Professors Ciechanover, Hershko and Rose received the '''Nobel Prize''' in 2004 for their discovery of the process by which ubiquitin mediates protein proteolysis<ref>PMID:15646859</ref>.
==Additional Resources==
==Additional Resources==
See also:
See also:
*[[Tumor susceptibility gene 101]]
*[[Tumor susceptibility gene 101]]
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*SUMO
+
*[[SUMO]]
== Disease ==
== Disease ==
The UBB-proteasome system deregulation has been implicated in the pathogenesis of many neurodegenerative disorders like Alzheimer's disease, Parkinson disease, Huntington disease, Prion-like lethal disorders and in genetic diseases like cystic fibrosis, angelman's syndrome, Liddle syndrome and many cancers<ref>PMID:18937370</ref>.
The UBB-proteasome system deregulation has been implicated in the pathogenesis of many neurodegenerative disorders like Alzheimer's disease, Parkinson disease, Huntington disease, Prion-like lethal disorders and in genetic diseases like cystic fibrosis, angelman's syndrome, Liddle syndrome and many cancers<ref>PMID:18937370</ref>.
 +
 +
==[[3D structures of ubiquitin]]==
</StructureSection>
</StructureSection>
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== 3D Structures of Ubiquitin ==
 
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Updated on {{REVISIONDAY2}}-{{MONTHNAME|{{REVISIONMONTH}}}}-{{REVISIONYEAR}}
 
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{{#tree:id=OrganizedByTopic|openlevels=0|
 
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* Ubiquitin
 
- 
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**[[2kn5]], [[2klg]], [[2jzz]], [[2pe9]], [[2pea]], [[1g6j]], [[1d3z]], [[2kox]], [[2ld9]], [[2k25]], [[5ujl]] – hUBB – NMR - human<br />
 
-
**[[2ojr]], [[2nr2]], [[2fcq]], [[1ubi]], [[1ubq]], [[1xqq]], [[3ons]], [[4wzp]], [[5k9p]], [[4zqs]], [[5dk8]], [[4xof]], [[4xok]], [[4xol]], [[4zpz]] - hUBB<br />
 
-
**[[2zcb]], [[2gbj]], [[2gbk]], [[2gbm]], [[2gbn]], [[2gbr]], [[2fcm]], [[2fcn]], [[2fcs]], [[1yiw]], [[1yj1]], [[1sif]], [[1ogw]], [[4hk2]], [[4hjk]], [[4pij]], [[4pih]], [[4pig]] - hUBB (mutant)<br />
 
-
**[[1c3t]], [[1ud7]], [[2mi8]], [[2rsu]], [[2ru6]] - hUBB (mutant) - NMR<br />
 
-
**[[2m0x]] - hUBB - engineered – NMR<br />
 
-
**[[1gjz]], [[2l3z]] – hUBB N-terminal – NMR<br />
 
-
**[[1e0q]] - hUBB N-terminal (mutant) – NMR<br />
 
-
**[[3q3f]] – hUBB/ribonuclease<br />
 
-
**[[2k39]] – fUBB – frog – NMR<br />
 
-
**[[2jwz]], [[1zw7]] – yUBB (mutant) – yeast<br />
 
-
**[[1cmx]] – yUBB (modified)<br />
 
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**[[2zcc]] – bUBB - bovine<br />
 
- 
-
* Ubiquitin+1 mutant
 
- 
-
**[[2kx0]] – hUBB+1 – human – NMR<br />
 
-
**[[3k9o]] – hUBB+1+E2<br />
 
- 
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* Ubiquitin dimer
 
- 
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**[[2xk5]], [[3nob]], [[2xew]], [[3h7p]], [[3h7s]], [[2w9n]], [[2jf5]], [[3ns8]], [[3aul]], [[3axc]], [[5gob]], [[5goc]], [[5god]], [[5gog]], [[5goh]], [[5goi]], [[5goj]], [[5j8p]] – hDiUBB<br />
 
-
**[[2mbo]], [[2mbq]] – hDiUBB – NMR<br />
 
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**[[2bgf]] – hDiUBB – chemical relaxation<br />
 
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**[[3m3j]], [[1aar]], [[3aui]], [[4s22]] – bDiUBB <br />
 
- 
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* Ubiquitin dimer bound to protein
 
- 
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**[[3a9j]], [[3a9k]], [[2wwz]], [[2wx0]], [[2wx1]] – hDiUBB+mitogen-activated protein kinase<br />
 
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**[[3jsv]], [[2zvn]], [[2zvo]] – hDiUBB+NF-κ-b essential modulator<br />
 
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**[[3dvg]], [[3dvn]] – hDiUBB+IGG1 fab light&heavy chains<br />
 
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**[[3b08]], [[3b0a]] – hDiUBC + HOIL-1<br />
 
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**[[3u30]] – hDiUBB + antibody<br />
 
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**[[4hxd]] – hDiUBB + RNA polymerase <br />
 
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**[[5o6t]] – hDiUBB + E3 UBB protein ligase XIAP<br />
 
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**[[2lvp]], [[2lvq]] – hDiUBB + E3 UBB protein ligase - NMR<br />
 
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**[[4ksk]], [[4ksl]] – hDiUBB + Fam105B<br />
 
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**[[4fjv]] – hDiUBB + UBB thiolesterase <br />
 
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**[[4bos]] – hDiUBB + UBB thiolesterase + OTUD2<br />
 
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**[[4s1z]] – hDiUBB + ZranB1<br />
 
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**[[5e6j]] – hDiUBB (mutant) + replicase polyprotein<br />
 
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**[[2n13]] – hDiUBB + myosin peptide - NMR<br />
 
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**[[3wwq]] – hDiUBB + FAAP20 peptide <br />
 
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**[[5ohp]], [[5ohn]], [[5ohk]] – hDiUBB + USP30<br />
 
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**[[2kde]], [[2kdf]] – fDiUBB+26S proteasome non-ATPase regulatory subunit - NMR<br />
 
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**[[3a1q]] – mDiUBB+UBB interaction motif-containing protein <br />
 
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**[[2znv]] – mDiUBB+hAMSH-like protease<br />[[3ptf]] – hDiUBB + UBB conjugating enzyme E2<br />
 
- 
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* Ubiquitin trimer
 
- 
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**[[5go7]], [[5gok]], [[5jby]], [[5jbv]] – hTriUBB <br />
 
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**[[3zlz]], [[5o44]] – hTriUBB (mutant) <br />
 
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**[[4boz]] – hTriUBB + UBB thiolesterase <br />
 
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**[[3vuw]], [[3vux]] – hTriUBB + TNF α-induced proitein <br />
 
- 
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* Ubiquitin tetramer
 
- 
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**[[5go8]] – hTetraUBB <br />
 
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**[[3tmp]] – hTetraUBB + deubiquitinase<br />
 
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**[[3alb]], [[3hm3]], [[2o6v]], [[1f9j]], [[1tbe]] – tetra-hUBB<br />
 
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**[[3zni]] – hTetraUBB + E3 UBB protein ligase + tyrosine protein kinase + UBB conjugating enzyme E2<br />
 
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**[[5b83]] – hTetraUBB + optineurin<br />
 
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**[[3vuy]] – hTetraUBB + TNF α-induced proitein <br />
 
- 
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* Polyubiquitin-B
 
- 
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**[[4zpz]] – hUBB (mutant)<br />
 
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**[[5x3o]], [[3x3m]] – hUBB + d-ubiquitin <br />
 
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**[[3phd]] – hUBB + histone deacetylase 6
 
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**[[3znh]] – hUBB + UBB thioesterase<br />
 
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**[[5ydr]] – hUBB + DNMT1<br />
 
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**[[6fdk]] – hUBB + DUB1<br />
 
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**[[6ei1]], [[6fge]] – hUBB + ZUP1<br />
 
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**[[6cp2]] – hUBB + UBCH7 + SIDC<br />
 
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**[[6bva]], [[6byh]], [[6c16]] – hUBB + SKP1 + FBL10<br />
 
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**[[4uf6]] – hUBB + UCH-L5 + NF-κ-b-related protein<br />
 
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**[[5vf0]] – hUBB + RAD18 - NMR<br />
 
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**[[5vey]] – hUBB + RNF169 + Histone H2A-H2B - NMR<br />
 
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**[[5n38]] , [[5n2w]], [[6glc]] – hUBB + E3 UBB protein ligase PARKIN<br />
 
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**[[6fx4]] – hUBB (mutant) + E3 UBB protein ligase SMURF2<br />
 
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**[[5mnj]] – hUBB + E3 UBB protein ligase MDM2 + UBCH5B<br />
 
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**[[5l8w]] – hUBB + WD repeat-containing protein 48 + USP12<br />
 
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**[[5l8h]] – hUBB + WD repeat-containing protein 48 + USP46<br />
 
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**[[5kyf]], [[5kye]], [[5kyd]], [[5kyc]] – hUBB + USP7<br />
 
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**[[6ftx]] – hUBB + histones H4+H2A+H2B+H3.3C + DNA - Cryo EM<br />
 
- 
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* Polyubiquitin-C
 
- 
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**[[5af4]], [[4xyz]] – hUBC <br />
 
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**[[5af5]], [[5nl4]] – hUBC (mutant)<br />
 
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**[[3znz]] – hUBC + otulin<br />
 
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**[[4jqw]] – hUBC + NOD1 CARD<br />
 
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**[[4k1r]] – hUBC + SST2<br />
 
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**[[5oe7]] – hUBC + otulin<br />
 
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**[[6b7m]], [[6b70]] – hUBC + SDED<br />
 
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**[[6aqr]] – hUBC + SAGA + UBP8 + SGF11 + SUS1 + SGF73<br />
 
- 
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* Ubiquitin monomer bound to protein
 
- 
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**[[3ofi]] – hUBB+insulin protease
 
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**[[3n3k]], [[3ifw]], [[3kvf]], [[3kw5]], [[3irt]], [[3mtn]], [[3ihp]], [[3v6c]], [[3v6e]]– hUBB (mutant)+hUBB carboxyl-terminal esterase catalytic domain<br />
 
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**[[3i3t]], [[2ibi]], [[2ayo]], [[1nbf]], [[2wdt]], [[4i6l]], [[4i6n]], [[4ig7]], [[5l8h]], [[5jtj]], [[5cvm]] - hUBB+hUBB carboxyl-terminal hydrolase catalytic domain<br />
 
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**[[5l8w]], [[5cvn]], [[5cvo]] – hUBB + UBB carboxy terminal hydrolase 12 + WD repeat containing protein 48<br />
 
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**[[2khw]] – hUBB+immunoglobulin G-binding protein G<br />
 
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**[[1yx5]], [[1yx6]] - hUBB+26S proteasome non-ATPase regulatory subunit – NMR<br />
 
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**[[2k6d]] – hUBB+SH3 domain-containing kinase-binding protein – NMR<br />
 
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**[[2z59]] – hUBB+mProtein Adhesion-regulating molecule 1<br />
 
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**[[2jy6]] – hUBB+hUbiquilin – NMR<br />
 
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**[[3by4]], [[3c0r]] – hUBB+yUBB thioesterase<br />
 
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**[[2hth]] – hUBB+vacuolar protein sorting protein<br />
 
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**[[1s1q]] – hUBB+tumor susceptibility gene 101 protein<br />
 
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**[[1q5w]] – hUBB+NPL4 zinc-fingers<br />
 
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**[[2k8b]], [[2k8c]] – hUBB+phospholipase A2-activating protein fragment<br />
 
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**[[2ktf]] – hUBB+hDNA polymerase IOTA<br />
 
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**[[2l0f]] – hUBB (mutant)+hDNA polymerase IOTA<br />
 
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**[[2kwu]], [[2kwv]] - hUBB+mDNA polymerase IOTA – mouse<br />
 
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**[[2l0t]] – hUBB+signal transducing adapter molecule 2<br />
 
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**[[3o65]] – hUBB+ataxin-3-like protein josephin domain<br />
 
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**[[3oj3]] – hUBB+tumor necrosis factor α-induced protein 3<br />
 
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**[[3prm]], [[3prp]] – hUBB+protein L<br />
 
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**[[3pt2]] – hUBB+RNA polymerase OTU domain<br />
 
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**[[5v5i]], [[5v5h]], [[5v5g]] - hUBB+RNA polymerase L<br />
 
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**[[2rr9]] – hUBB + Uimc1<br />
 
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**[[2g45]] – hUBB + isopeptidase T<br />
 
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**[[2den]] – hUBB + immunoglobulin G binding protein/ubiquitin-like protein 7 - NMR<br />
 
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**[[4xkl]] – hUBB + NDP52<br />
 
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**[[4zfr]], [[4zft]] – hUBB + SST2<br />
 
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**[[2j7q]] – hUBB + MCMV tegument protein<br />
 
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**[[4dhj]], [[4dhz]] – hUBB (mutant) + UBB thiolesterase + UBB aldehyde <br />
 
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**[[3rul]] – hUBB + dalvancin<br />
 
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**[[3vfk]] – hUBB + monodechloro-teicoplanin <br />
 
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**[[4ium]], [[4wur]], [[4mm3]] – hUBB+ papain-like protease<br />
 
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**[[2lz6]], [[2mcn]] – hUBB + CD2-associated protein<br />
 
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**[[2mbh]] – hUBB + Kreuppel-like factor<br />
 
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**[[3tbl]] – hUBB + PCNA<br />
 
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**[[3vht]] – hUBB + GFP<br />
 
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**[[4jio]] – hUBB + yBRO1<br />
 
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**[[5af6]] – hUBB + TRABID<br />
 
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**[[4un2]] – hUBB + Dsk2 peptide<br />
 
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**[[4msq]], [[4msm]] – hUBB + AMSH-like protease<br />
 
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**[[5ln1]] – hUBB + RPN10<br />
 
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**[[5v1z]], [[5v1y]] – hUBB + RPN13 + RPN2<br />
 
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**[[5jp3]] – hUBB + xanthomonas outer protein<br />
 
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**[[5lrw]] – hUBB (mutant)+ OUT domain containing protein 7B<br />
 
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**[[5lrx]] – hUBB (mutant)+ OUT domain containing protein 7C<br />
 
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**[[5kgf]] – hUBB + nucleosome - Cryo EM<br />
 
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**[[2nbv]] – hUBB + proteasomal UBB receptor - NMR<br />
 
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**[[5jg6]] – hUBB + anaphase promoting complex subunit 11<br />
 
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**[[6eqi]] – hUBB + NB696 + PINK1<br />
 
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**[[5ohv]] – hUBB + K33-specific affimer<br />
 
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**[[5af6]] – hUBB + TRABID<br />
 
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**[[4un2]] – hUBB + Dsk2 peptide<br />
 
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**[[4msq]], [[4msm]] – hUBB + AMSH-like protease<br />
 
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**[[4m0w]] – bUBB + replicase polyprotein<br />
 
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**[[1uzx]] – bUBB+VPS23 UEV<br />
 
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**[[2hd5]] - bUBB+hUBB carboxyl-terminal hydrolase catalytic domain<br />
 
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**[[3ldz]] – bUBB+signal transducing adapter molecule<br />
 
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**[[1v80]], [[1v81]] – bUBB/L40 ribosomal protein fusion - NMR<br />
 
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**[[2dx5]], [[1p3q]] - bUBB+vacuolar protein sorting protein<br />
 
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**[[2c7m]], [[2c7n]], [[2fid]], [[2fif]] – bUBB+RAB guanine nucleotide exchange factor<br />
 
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**[[2d3g]] – bUBB+HRS-UIM<br />
 
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**[[1wrd]] – bUBB+TOM1 GAT domain<br />
 
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**[[1wr6]], [[1yd8]] - bUBB+GGA3 GAT domain<br />
 
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**[[1uzx]] – bUBB+VPS23 UEV<br />
 
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**[[2kdi]] – yUBB/UIM fusion <br />
 
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**[[2jt4]] – yUBB fragment+cytoskeleton assembly control protein<br />
 
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**[[1q0w]] - yUBB+vacuolar protein sorting protein<br />
 
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**[[2g3q]] – yUBB+EDE1 UBA<br />
 
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**[[1wr1]] – yUBB+DSK2P UBA<br />
 
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**[[1otr]] – yUBB+CUE2<br />
 
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**[[2l00]] – yUBB + Zfand5<br />
 
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**[[4nql]] – mUBB + AMSH-like protease<br />
 
- 
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* Ubiquitin complex with ubiquitination enzymes
 
- 
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**[[1fxt]], [[3oj4]], [[3ugb]], [[5dfl]], [[3k9p]], [[3a33]], [[5ulf]], [[5tut]] – hUBB + UBB conjugating enzyme E2<br />
 
-
**[[5bnb]], [[2kjh]], [[1zgu]] – hUBB (mutant) + UBB conjugating enzyme E2<br />
 
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**[[5edv]], [[4whv]], [[5ait]], [[5aiu]], [[3jvz]], [[3jw0]], [[5udh]], [[5tte]] – hUBB + UBB conjugating enzyme E2 + E3 UBB-protein ligase<br />
 
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**[[3cmm]] – yUBB + UBB activating enzyme E1<br />
 
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**[[5knl]] – yUBB (mutant) + UBB activating enzyme E1 + UBB conjugating enzyme E2 <br />
 
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**[[5tr4]] – bUBB + UBB activating enzyme E1<br />
 
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**[[2gmi]] – hUBB + UBB conjugating enzyme E2<br />
 
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**[[2fuh]] – hUBB + UBB conjugating enzyme E2 - NMR<br />
 
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**[[5d0k]], [[5d0m]], [[5ulk]], [[5ulh]] – hUBB + UBB conjugating enzyme E2 + RNF165<br />
 
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**[[2oob]], [[2qho]] – hUBB + E3 UBB protein ligase<br />
 
-
**[[2lvo]] – hUBB + E3 UBB protein ligase - NMR<br />
 
-
**[[5o76]] – hUBB + Zap70 peptide + E3-UBB-protein ligase CBL<br />
 
-
**[[4auq]] – hUBB + UBB conjugating enzyme E2 + livin<br />
 
-
**[[4q5h]], [[4q5e]] – yUBB + UBB conjugating enzyme E2 + OspG<br />
 
- 
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* Ubiquitin + ions
 
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**[[3h1u]] – bUBB+Cd<br />
 
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**[[3ehv]], [[3eec]], [[3efu]] – hUBB+ions<br />
 
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**[[3n30]], [[4k7s]], [[4k7u]], [[4k7w]] – hUBB+Zn<br />
 
-
**[[3n32]] – hUBB+Pt<br />
 
-
}}
 
==References==
==References==
<references />
<references />
[[Category:Topic Page]]
[[Category:Topic Page]]

Current revision

Human ubiquitin (green) complex with ubiquitin-conjugating enzyme E2 (deep sky blue), 3k9p

Drag the structure with the mouse to rotate

References

  1. Li W, Ye Y. Polyubiquitin chains: functions, structures, and mechanisms. Cell Mol Life Sci. 2008 Aug;65(15):2397-406. PMID:18438605 doi:10.1007/s00018-008-8090-6
  2. Hershko A, Ciechanover A. The ubiquitin system. Annu Rev Biochem. 1998;67:425-79. PMID:9759494 doi:http://dx.doi.org/10.1146/annurev.biochem.67.1.425
  3. Neefjes J, Groothuis TA, Dantuma NP. [The 2004 Nobel Prize in Chemistry for the discovery of ubiquitin-mediated protein degradation]. Ned Tijdschr Geneeskd. 2004 Dec 25;148(52):2579-82 PMID:15646859
  4. Paul S. Dysfunction of the ubiquitin-proteasome system in multiple disease conditions: therapeutic approaches. Bioessays. 2008 Nov;30(11-12):1172-84. doi: 10.1002/bies.20852. PMID:18937370 doi:http://dx.doi.org/10.1002/bies.20852
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