Proteasome

As stated in the paper of Peters , et al., 1994:"Proteasomes are very large protein complexes found in some of the living organisms".

Proteasomes have a key essential role in the cell by controling the protein and degrading the amino acids creating new proteins(Lodish H et al., 2004).

References:

1.^ Peters, Jan-Michael; Franke, Werner W.; Kleinschmidt, Jiirgen A. (March 1994). "Distinct 19 S and 20 S subcomplexes of the 26 S proteasome and their distribution in the nucleus and the cytoplasm". The Journal of Biological Chemistry 269 (10): 7709–18. PMID 8125997

2.Lodish H, Berk A, Matsudaira P, Kaiser CA, Krieger M, Scott MP, Zipursky SL, Darnell J (2004). "3". Molecular cell biology (5th ed.). New York: W.H. Freeman and CO. pp. 66–72. ISBN 0-7167-4366-3.