Definition of "proteasome" [proteasome]

• A complex protein, found in bacterial, archeal and eukaryotic cells, that breaks down other proteins via proteolysis. (noun)

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• "The 20s proteasome is a heteromer composed of 28 non-identical subunits."
• "The 20s proteasome is the result of a duplication of a homomer."
• "The drug seems to work by stopping an enzyme called the proteasome from degrading proteins no longer needed by the cell."