ID   UBIQ_AVESA              Reviewed;          76 AA.
AC   P69310; O82079; P03993;
DT   23-OCT-1986, integrated into UniProtKB/Swiss-Prot.
DT   23-OCT-1986, sequence version 1.
DT   03-AUG-2022, entry version 51.
DE   RecName: Full=Ubiquitin;
OS   Avena sativa (Oat).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; Liliopsida; Poales; Poaceae; BOP clade;
OC   Pooideae; Poodae; Poeae; Aveninae; Avena.
OX   NCBI_TaxID=4498;
RN   [1]
RP   PROTEIN SEQUENCE.
RA   Vierstra R.D., Langan S.M., Schaller G.E.;
RT   "Complete amino acid sequence of ubiquitin from the higher plant Avena
RT   sativa.";
RL   Biochemistry 25:3105-3108(1986).
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-48-linked is involved in protein degradation via the proteasome.
CC       Linear polymer chains formed via attachment by the initiator Met lead
CC       to cell signaling. Ubiquitin is usually conjugated to Lys residues of
CC       target proteins, however, in rare cases, conjugation to Cys or Ser
CC       residues 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}.
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DR   PIR; A02576; UQOA.
DR   AlphaFoldDB; P69310; -.
DR   SMR; P69310; -.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0005634; C:nucleus; IEA:UniProtKB-SubCell.
DR   GO; GO:0003729; F:mRNA binding; IEA:UniProt.
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; Direct protein sequencing; Isopeptide bond; Nucleus;
KW   Ubl conjugation.
FT   CHAIN           1..76
FT                   /note="Ubiquitin"
FT                   /id="PRO_0000114835"
FT   DOMAIN          1..76
FT                   /note="Ubiquitin-like"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00214"
FT   CROSSLNK        48
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)"
SQ   SEQUENCE   76 AA;  8525 MW;  852936277CD8403E CRC64;
     MQIFVKTLTG KTITLEVESS DTIDNVKAKI QDKEGIPPDQ QRLIFAGKQL EDGRTLADYN
     IQKESTLHLV LRLRGG