ID   UBIQ_ENCCU              Reviewed;          77 AA.
AC   Q8SWD4;
DT   31-AUG-2004, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-2002, sequence version 1.
DT   25-MAY-2022, entry version 95.
DE   RecName: Full=Ubiquitin;
DE   Flags: Precursor;
GN   OrderedLocusNames=ECU02_0740i;
OS   Encephalitozoon cuniculi (strain GB-M1) (Microsporidian parasite).
OC   Eukaryota; Fungi; Fungi incertae sedis; Microsporidia; Unikaryonidae;
OC   Encephalitozoon.
OX   NCBI_TaxID=284813;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=GB-M1;
RX   PubMed=11719806; DOI=10.1038/35106579;
RA   Katinka M.D., Duprat S., Cornillot E., Metenier G., Thomarat F.,
RA   Prensier G., Barbe V., Peyretaillade E., Brottier P., Wincker P.,
RA   Delbac F., El Alaoui H., Peyret P., Saurin W., Gouy M., Weissenbach J.,
RA   Vivares C.P.;
RT   "Genome sequence and gene compaction of the eukaryote parasite
RT   Encephalitozoon cuniculi.";
RL   Nature 414:450-453(2001).
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}.
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DR   EMBL; AL590442; CAD25104.1; -; Genomic_DNA.
DR   RefSeq; NP_584600.1; NM_001040789.1.
DR   AlphaFoldDB; Q8SWD4; -.
DR   SMR; Q8SWD4; -.
DR   STRING; 284813.Q8SWD4; -.
DR   GeneID; 858590; -.
DR   KEGG; ecu:ECU02_0740i; -.
DR   VEuPathDB; MicrosporidiaDB:ECU02_0740i; -.
DR   HOGENOM; CLU_010412_6_3_1; -.
DR   InParanoid; Q8SWD4; -.
DR   OMA; PPIMEAT; -.
DR   OrthoDB; 1536766at2759; -.
DR   Proteomes; UP000000819; Chromosome II.
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; Reference proteome; Ubl conjugation.
FT   CHAIN           1..76
FT                   /note="Ubiquitin"
FT                   /id="PRO_0000035933"
FT   PROPEP          77
FT                   /id="PRO_0000035934"
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   77 AA;  8714 MW;  78942D32397FFD9E CRC64;
     MQIFVKTLTG KTITLEVEPS DSIENVKAKI QDKEGIPPDQ QRLIFAGKQL EDGRTLSDYN
     IQKESTLHLV LRLRGGY