Figure 1.

Bacterial pupylation, like eukaryotic ubiquitination, targets proteins for proteasomal degradation. (a,b) Pupylation (a) or ubiquitination (b) of a target protein is shown. Both small protein modifiers (red) are attached to a lysine side chain of a substrate protein (grey). A random coil model of Pup (red) represents its intrinsically disordered state in solution. In contrast, ubiquitin (Ub) adopts a stable β-grasp fold (PDB 1aar). Note that Ub is linked to the substrate lysine via its carboxy-terminal di-glycine-motif ('GG'), while Pup is attached via its carboxy-terminal glutamate ('GGE').

Barandun et al. BMC Biology 2012 10:95   doi:10.1186/1741-7007-10-95
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