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phosphorylation
addition of phosphate group by kinase to tyr, ser, and thr, can lead to enzyme activation, often used in cell signaling
ubiquitination
marks protein for destruction (proteolysis), ubiquitin is recycled
proteasome
garbage can, destroys unneeded/unwanted proteins
glycoslyation
addition of sugars to proteins, often ones imbedded in membranes on side facing out of cell