Superheroes of Science
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Researching the Kiss of Death
Proteins perform a lot of different jobs within our cells. As proteins either age or mutate, they can begin to cause problems for the cells. The ubiquitin system, (present only in eukaryotic organisms - animals and plants), works to tag proteins that go bad. Proteins tagged by the ubiquitin system send a signal to proteasomes which then shred the bad protein, hence the expression “kiss of death.”