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Different types of ubiquitination. Monoubiquitination represents modification of protein by a single ubiquitin (A), or by several single ubiquitins (B). Polyubiquitination (C) corresponds to the successive addition of several ubiquitins on one of their seven lysine residues. All types of ubiquitination involve isopeptide bonds anchoring ubiquitin to either the ε-NH2 group of a lysine in the target substrate, or to the α-NH2 group of its amino-terminal residue.
