UBIQ_RABIT
ID UBIQ_RABIT Reviewed; 76 AA.
AC P62975; P02248; P02249; P02250; Q29120; Q91887; Q91888;
DT 21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT 13-AUG-1987, sequence version 1.
DT 25-MAY-2022, entry version 85.
DE RecName: Full=Ubiquitin;
OS Oryctolagus cuniculus (Rabbit).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC Eutheria; Euarchontoglires; Glires; Lagomorpha; Leporidae; Oryctolagus.
OX NCBI_TaxID=9986;
RN [1]
RP PROTEIN SEQUENCE.
RC TISSUE=Brain;
RX PubMed=1337207;
RA Wajih N., Siddiqi A.R., Kaiser R., Persson B., Zaidi Z.H., Joernvall H.;
RT "Structural characterization of rabbit brain ubiquitin.";
RL Protein Seq. Data Anal. 5:31-32(1992).
CC -!- FUNCTION: Ubiquitin Exists either covalently attached to another
CC protein, or free (unanchored). When covalently bound, it is conjugated
CC to target proteins via an isopeptide bond either as a monomer
CC (monoubiquitin), a polymer linked via different Lys residues of the
CC ubiquitin (polyubiquitin chains) or a linear polymer linked via the
CC initiator Met of the ubiquitin (linear polyubiquitin chains).
CC Polyubiquitin chains, when attached to a target protein, have different
CC functions depending on the Lys residue of the ubiquitin that is linked:
CC Lys-6-linked may be involved in DNA repair; Lys-11-linked is involved
CC in ERAD (endoplasmic reticulum-associated degradation) and in cell-
CC cycle regulation; Lys-29-linked is involved in proteotoxic stress
CC response and cell cycle; Lys-33-linked is involved in kinase
CC modification; Lys-48-linked is involved in protein degradation via the
CC proteasome; Lys-63-linked is involved in endocytosis, DNA-damage
CC responses as well as in signaling processes leading to activation of
CC the transcription factor NF-kappa-B. Linear polymer chains formed via
CC attachment by the initiator Met lead to cell signaling. Ubiquitin is
CC usually conjugated to Lys residues of target proteins, however, in rare
CC cases, conjugation to Cys or Ser residues has been observed. When
CC polyubiquitin is free (unanchored-polyubiquitin), it also has distinct
CC roles, such as in activation of protein kinases, and in signaling (By
CC similarity). {ECO:0000250}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250}. Nucleus {ECO:0000250}.
CC -!- MISCELLANEOUS: Ubiquitin is synthesized as a polyubiquitin precursor
CC with exact head to tail repeats, the number of repeats differ between
CC species. In some species there is a final amino-acid after the last
CC repeat. Some ubiquitin genes contain a single copy of ubiquitin fused
CC to a ribosomal protein (either L40 or S27a).
CC -!- SIMILARITY: Belongs to the ubiquitin family. {ECO:0000305}.
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DR PIR; S28203; S28203.
DR PDB; 4UJC; EM; 9.50 A; m=1-76.
DR PDB; 4UJD; EM; 8.90 A; m=1-76.
DR PDB; 4UJE; EM; 6.90 A; m=1-76.
DR PDBsum; 4UJC; -.
DR PDBsum; 4UJD; -.
DR PDBsum; 4UJE; -.
DR AlphaFoldDB; P62975; -.
DR SMR; P62975; -.
DR STRING; 9986.ENSOCUP00000001111; -.
DR eggNOG; KOG0004; Eukaryota.
DR Proteomes; UP000001811; Unplaced.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0005634; C:nucleus; IEA:UniProtKB-SubCell.
DR InterPro; IPR000626; Ubiquitin-like_dom.
DR InterPro; IPR029071; Ubiquitin-like_domsf.
DR InterPro; IPR019954; Ubiquitin_CS.
DR InterPro; IPR019956; Ubiquitin_dom.
DR Pfam; PF00240; ubiquitin; 1.
DR PRINTS; PR00348; UBIQUITIN.
DR SMART; SM00213; UBQ; 1.
DR SUPFAM; SSF54236; SSF54236; 1.
DR PROSITE; PS00299; UBIQUITIN_1; 1.
DR PROSITE; PS50053; UBIQUITIN_2; 1.
PE 1: Evidence at protein level;
KW 3D-structure; Cytoplasm; Direct protein sequencing; Isopeptide bond;
KW Nucleus; Reference proteome; Ubl conjugation.
FT CHAIN 1..76
FT /note="Ubiquitin"
FT /id="PRO_0000114805"
FT DOMAIN 1..76
FT /note="Ubiquitin-like"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00214"
FT SITE 54
FT /note="Interacts with activating enzyme"
FT SITE 68
FT /note="Essential for function"
FT SITE 72
FT /note="Interacts with activating enzyme"
FT CROSSLNK 6
FT /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT G-Cter in ubiquitin)"
FT /evidence="ECO:0000250|UniProtKB:P0CG47"
FT CROSSLNK 11
FT /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT G-Cter in ubiquitin)"
FT /evidence="ECO:0000250|UniProtKB:P0CG47"
FT CROSSLNK 27
FT /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT G-Cter in ubiquitin)"
FT /evidence="ECO:0000250|UniProtKB:P0CG47"
FT CROSSLNK 29
FT /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT G-Cter in ubiquitin)"
FT /evidence="ECO:0000250|UniProtKB:P0CG47"
FT CROSSLNK 33
FT /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT G-Cter in ubiquitin)"
FT /evidence="ECO:0000250|UniProtKB:P0CG47"
FT CROSSLNK 48
FT /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT G-Cter in ubiquitin)"
FT /evidence="ECO:0000269|PubMed:1337207"
FT CROSSLNK 63
FT /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT G-Cter in ubiquitin)"
FT /evidence="ECO:0000250|UniProtKB:P0CG47"
FT CROSSLNK 76
FT /note="Glycyl lysine isopeptide (Gly-Lys) (interchain with
FT K-? in acceptor proteins)"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00214,
FT ECO:0000269|PubMed:1337207"
SQ SEQUENCE 76 AA; 8565 MW; C42A35397FFD9B52 CRC64;
MQIFVKTLTG KTITLEVEPS DTIENVKAKI QDKEGIPPDQ QRLIFAGKQL EDGRTLSDYN
IQKESTLHLV LRLRGG
