MeSH definition : Complexes of enzymes that catalyze the covalent attachment of UBIQUITIN to other proteins
by forming a peptide bond between the C-terminal GLYCINE of UBIQUITIN and the alpha-amino
groups of LYSINE residues in the protein. The complexes play an important role in
mediating the selective-degradation of short-lived and abnormal proteins. The complex
of enzymes can be broken down into three components that involve activation of ubiquitin
(UBIQUITIN-ACTIVATING ENZYMES), conjugation of ubiquitin to the ligase complex (UBIQUITIN-CONJUGATING
ENZYMES), and ligation of ubiquitin to the substrate protein (UBIQUITIN-PROTEIN LIGASES).;
Complexes of enzymes that catalyze the covalent attachment of UBIQUITIN to other proteins
by forming a peptide bond between the C-terminal GLYCINE of UBIQUITIN and the alpha-amino
groups of LYSINE residues in the protein. The complexes play an important role in
mediating the selective-degradation of short-lived and abnormal proteins. The complex
of enzymes can be broken down into three components that involve activation of ubiquitin
(UBIQUITIN-ACTIVATING ENZYMES), conjugation of ubiquitin to the ligase complex (UBIQUITIN-CONJUGATING
ENZYMES), and ligation of ubiquitin to the substrate protein (UBIQUITIN-PROTEIN LIGASES).