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[mass noun] A compound found in living cells which plays a role in the degradation of defective and superfluous proteins. It is a single-chain polypeptide.
- ‘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.’
- ‘The protein is linked to a second protein, ubiquitin, when the cell detects that DNA damage has occurred.’
1970s: from ubiquitous + -in.
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