NCBI Accession #
NP_001189768.1
NCBI GenBank Nucleotide #
NM_001202839.1
NCBI Official Full Name
ubiquitin 6
NCBI Official Symbol
UBQ6
NCBI Official Synonym Symbols
F14M4.6; UBI6; ubiquitin 6; UBIQUITIN EXTENSION PROTEIN 6
NCBI Protein Information
ubiquitin 6
NCBI Summary
polyubiquitin gene
UniProt Gene Name
RPS27AB
UniProt Synonym Gene Names
UBQ6
UniProt Protein Name
Ubiquitin-40S ribosomal protein S27a-2
UniProt Primary Accession #
P59232
UniProt Secondary Accession #
O80715; P19233; P59263; Q38875; Q9LDJ2; Q9LYW1; Q9M0W3; Q9M1P9; Q9S7X3
UniProt Related Accession #
P59232
UniProt Comments
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-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, and DNA-damage responses. 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 .