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The protein is linked to a second protein, ubiquitin , when the cell detects that DNA damage has occurred.
This suggests that independent protein degradation pathways for ubiquitin , as well as for the proteasome complex, may exist in strawberry fruit.
Ubp3 is a deubiquitination enzyme and a member of a large family of cysteine proteases that cleave ubiquitin moieties from protein substrates.
Comparison of simulations of the unfolding processes of protein L and ubiquitin suggests that these proteins unfold by a similar structural mechanism.
Ubiquitin is a 7.6kDa protein that is covalently attached to proteins targeted for degradation by ubiquitin ligases.
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