ubiquitin By Ivan Suarez Robles 17 Nov, 2010 A small molecule that latches onto damaged or mutated proteins in the cell. Ubiquitin acts as a flag indicating that these proteins can be destroyed by enzymes called proteasomesRelated Articles: Glossary: UPSHuntingtin Protein and Protein AggregationInterview with Dr. Ron Kopito and Dr. Brigit Riley at Stanford UniversityAbout Autophagy Rapamycin