Medical Definition of proteasome
: a hollow, cylindrical cellular structure that is a complex of proteases involved in the selective degradation of intracellular proteins and especially proteins marked for proteolysis by ubiquitin Tagged proteins are then fed into the proteasome, a barrel-shaped multi-protein complex that chops proteins down into their component amino acids for reuse.—Caroline Williams, New Scientist, 2 Sept. 2006
Seen and Heard
What made you want to look up proteasome? Please tell us where you read or heard it (including the quote, if possible).