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Protein

Polyubiquitin

Gene
N/A
Organism
Xenopus laevis (African clawed frog)
Status
Reviewed-Annotation score: -Experimental evidence at protein leveli

Functioni

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 (By similarity).By similarity

Miscellaneous

Ubiquitin is synthesized as a polyubiquitin precursor with exact head to tail repeats, the number of repeats differ between species (up to 12 in Xenopus). In some species there is a final amino-acid after the last repeat. Some ubiquitin genes contain a single copy of ubiquitin fused to a ribosomal protein (either L40 or S27a).
For the sake of clarity sequence features are annotated only for the first chain, and are not repeated for each of the following chains.

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Binding sitei69Activating enzyme1
Sitei83Essential for function1
Binding sitei87Activating enzyme1

Names & Taxonomyi

Protein namesi
Recommended name:
Polyubiquitin
Cleaved into the following chain:
OrganismiXenopus laevis (African clawed frog)
Taxonomic identifieri8355 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiAmphibiaBatrachiaAnuraPipoideaPipidaeXenopodinaeXenopusXenopus

Subcellular locationi

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionGraphics by Christian Stolte; Source: COMPARTMENTS

Keywords - Cellular componenti

Cytoplasm, Nucleus

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_0000114811‹1 – 15UbiquitinAdd BLAST›15
ChainiPRO_000039625016 – 91UbiquitinAdd BLAST76
ChainiPRO_000039625192 – 167UbiquitinAdd BLAST76

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Cross-linki21Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in ubiquitin)By similarity
Cross-linki26Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in ubiquitin)By similarity
Cross-linki42Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in ubiquitin)By similarity
Cross-linki44Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in ubiquitin)By similarity
Cross-linki48Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in ubiquitin)By similarity
Cross-linki63Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in ubiquitin)By similarity
Cross-linki78Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in ubiquitin)By similarity
Cross-linki91Glycyl lysine isopeptide (Gly-Lys) (interchain with K-? in acceptor proteins)PROSITE-ProRule annotation

Keywords - PTMi

Isopeptide bond, Ubl conjugation

Proteomic databases

PRIDEiP62972

Interactioni

Binary interactionsi

Show more details

Protein-protein interaction databases

DIPiDIP-40040N
IntActiP62972, 4 interactors
MINTiP62972

Structurei

Secondary structure

1167
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Beta strandi93 – 98Combined sources6
Beta strandi103 – 107Combined sources5
Helixi114 – 124Combined sources11
Turni129 – 131Combined sources3
Beta strandi132 – 136Combined sources5
Turni147 – 151Combined sources5
Beta strandi157 – 163Combined sources7

3D structure databases

SMRiP62972
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiP62972

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini‹1 – 15Ubiquitin-like 1PROSITE-ProRule annotationAdd BLAST›15
Domaini16 – 91Ubiquitin-like 2PROSITE-ProRule annotationAdd BLAST76
Domaini92 – 167Ubiquitin-like 3PROSITE-ProRule annotationAdd BLAST76

Sequence similaritiesi

Belongs to the ubiquitin family.Curated

Keywords - Domaini

Repeat

Family and domain databases

InterProiView protein in InterPro
IPR019956 Ubiquitin
IPR029071 Ubiquitin-like_domsf
IPR019954 Ubiquitin_CS
IPR000626 Ubiquitin_dom
PfamiView protein in Pfam
PF00240 ubiquitin, 2 hits
PRINTSiPR00348 UBIQUITIN
SMARTiView protein in SMART
SM00213 UBQ, 2 hits
SUPFAMiSSF54236 SSF54236, 2 hits
PROSITEiView protein in PROSITE
PS00299 UBIQUITIN_1, 2 hits
PS50053 UBIQUITIN_2, 2 hits

Sequencei

Sequence statusi: Fragment.

Sequence processingi: The displayed sequence is further processed into a mature form.

P62972-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
QKESTLHLVL RLRGGMQIFV KTLTGKTITL EVEPSDTIEN VKAKIQDKEG
60 70 80 90 100
IPPDQQRLIF AGKQLEDGRT LSDYNIQKES TLHLVLRLRG GMQIFVKTLT
110 120 130 140 150
GKTITLEVEP SDTIENVKAK IQDKEGIPPD QQRLIFAGKQ LEDGRTLSDY
160
NIQKESTLHL VLRLRGG
Length:167
Mass (Da):18,801
Last modified:August 10, 2010 - v2
Checksum:i9C8F431544081131
GO

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Non-terminal residuei11

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
M11512 mRNA Translation: AAA49978.1
UniGeneiXl.4135

Similar proteinsi

Entry informationi

Entry nameiUBIQP_XENLA
AccessioniPrimary (citable) accession number: P62972
Secondary accession number(s): P02248
, P02249, P02250, Q29120, Q91887, Q91888
Entry historyiIntegrated into UniProtKB/Swiss-Prot: July 21, 1986
Last sequence update: August 10, 2010
Last modified: May 23, 2018
This is version 71 of the entry and version 2 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

3D-structure

Documents

  1. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  2. SIMILARITY comments
    Index of protein domains and families

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