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n. A small polypeptide present in the cells of all eukaryotes; it plays a part in modifying and degrading proteins

"Consequently, degradation of both abnormal and normal shortlived proteins was also inhibited, demonstrating that the same enzyme that is involved in ubiquitin activation for histone modification, is also involved in activation of ubiquitin for modification of substrates destined for degradation."

ubiquitination    ubiquitylation    ubiquitinate    ubiquitinated    ubiquitinylation   

ubiquitin polymer    ubiquitin ligase   

carboxy-terminal    polymerase    copper-containing    membrane-bound    thioester