ID   UBIQ_COPCO              Reviewed;          76 AA.
AC   P19848;
DT   01-FEB-1991, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1991, sequence version 1.
DT   25-MAY-2022, entry version 76.
DE   RecName: Full=Ubiquitin;
OS   Coprinellus congregatus (Inky cap fungus) (Coprinus congregatus).
OC   Eukaryota; Fungi; Dikarya; Basidiomycota; Agaricomycotina; Agaricomycetes;
OC   Agaricomycetidae; Agaricales; Psathyrellaceae; Coprinellus.
OX   NCBI_TaxID=5347;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   STRAIN=California;
RX   PubMed=2173831; DOI=10.1093/nar/18.21.6449;
RA   Foster L.M., Loftus M.G., Ross I.K.;
RT   "A novel form of ubiquitin found in the basidiomycete fungus, Coprinus
RT   congregatus.";
RL   Nucleic Acids Res. 18:6449-6449(1990).
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 lysosomal degradation;
CC       Lys-33-linked is involved in kinase modification; Lys-48-linked is
CC       involved in protein degradation via the proteasome; Lys-63-linked is
CC       involved in endocytosis, and DNA-damage responses. Linear polymer
CC       chains formed via attachment by the initiator Met lead to cell
CC       signaling. Ubiquitin is usually conjugated to Lys residues of target
CC       proteins, however, in rare cases, conjugation to Cys or Ser residues
CC       has been observed. When polyubiquitin is free (unanchored-
CC       polyubiquitin), it also has distinct roles, such as in activation of
CC       protein kinases, and in signaling (By similarity). {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250}. Nucleus {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the ubiquitin family. {ECO:0000305}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; X54672; CAA38483.1; -; mRNA.
DR   PIR; S12114; S12114.
DR   AlphaFoldDB; P19848; -.
DR   SMR; P19848; -.
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   Cytoplasm; Isopeptide bond; Nucleus; Ubl conjugation.
FT   CHAIN           1..76
FT                   /note="Ubiquitin"
FT                   /id="PRO_0000114856"
FT   DOMAIN          1..76
FT                   /note="Ubiquitin-like"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00214"
FT   CROSSLNK        6
FT                   /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT                   G-Cter in ubiquitin)"
FT   CROSSLNK        11
FT                   /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT                   G-Cter in ubiquitin)"
FT   CROSSLNK        27
FT                   /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT                   G-Cter in ubiquitin)"
FT   CROSSLNK        29
FT                   /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT                   G-Cter in ubiquitin)"
FT   CROSSLNK        33
FT                   /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT                   G-Cter in ubiquitin)"
FT   CROSSLNK        48
FT                   /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT                   G-Cter in ubiquitin)"
FT                   /evidence="ECO:0000250"
FT   CROSSLNK        63
FT                   /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT                   G-Cter in ubiquitin)"
FT   CROSSLNK        76
FT                   /note="Glycyl lysine isopeptide (Gly-Lys) (interchain with
FT                   K-? in acceptor proteins)"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00214"
SQ   SEQUENCE   76 AA;  8541 MW;  852936397D38403E CRC64;
     MQIFVKTLTG KTITLEVESS DTIDNVKAKI QDKEGIPPDQ QRLIFAGKQL EDGRTLSDYN
     IQKESTLHLV LRLRGG