Post-Translational Regulation
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Post-translational regulation modifies a finished protein's activity or tags it for degradation, acting only after translation has already produced it.
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A ubiquitin tag marks a finished protein for degradation by the proteasome, ending its activity without touching the mRNA that made it.
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Post-translational regulation acts at the opposite end from Bio 1333's translational regulation — after a protein exists, not before.