Covalent modifications of proteins, such as phosphorylation, acetylation and ubiquitylation, play an important role in most cellular processes because they can cause rapid changes in the activities of pre-existing proteins. This type of mechanism for regulating protein function is especially crucial in signal transduction pathways and in cell cycle. Posttranslational modifications (PTMs) by members of the ubiquitin family are covalent events that promote radical changes in the properties of modified proteins. Among all ubiqui...
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