Ubiquitin [P4D1]

Ubiquitin (Ub) is encoded by RPS27A gene mapped to human chromosome 2p16. The primary function of Ubiquitin is to clear abnormal, foreign and improperly folded proteins by targeting them for degradation by the 26S Proteosome. This small, 76 amino acid protein can be covalently attached to cellular proteins via an isopeptide linkage between the carboxy terminal group of Ubiquitin and lysine amino groups on the acceptor protein. Overexpression of ubiquitin results in advanced-phase chronic myeloid leukemia (CML) and acute leukemia (AL). Hence drugs targeting RPS27a combining with tyrosine kinase inhibitor (TKI) might be a potential treatment for TKI resistant CML patients. Elevated expression of ubiquitin carboxyl extension protein 1 (UBCEP-1), which is a component of ubiquitin pathway, promotes prostate carcinoma development, via increasing the degradation of proteins involved in growth inhibition or apoptosis.