Dharjath S Hameed

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Ubiquitin-specific proteases (USPs) are papain-like isopeptidases with variable inter- and intramolecular regulatory domains. To understand the effect of these domains on USP activity, we have analyzed the enzyme kinetics of 12 USPs in the presence and absence of modulators using synthetic reagents. This revealed variations of several orders of magnitude in(More)
Ubiquitin (Ub) and ubiquitin-like proteins (Ubls) form a family of small and highly conserved post-translational modifiers that become linked to target proteins and thus modulate their function (such as degradation, trafficking and signalling). The linkage between a Ub(l) and a target protein most frequently consists of an isopeptide bond between the(More)
Post-translational modification of proteins with ubiquitin (Ub) and Ub chains controls protein breakdown by the proteasome, cellular localization of proteins, transcriptional activity, and DNA repair. Ubiquitin is a highly conserved 76 amino acid protein that can be linked to target proteins through an isopeptide bond between the C-terminal carboxylate of(More)
Ubiquitin (Ub) signaling is a diverse group of processes controlled by covalent attachment of small protein Ub and polyUb chains to a range of cellular protein targets. The best documented Ub signaling pathway is the one that delivers polyUb proteins to the 26S proteasome for degradation. However, studies of molecular interactions involved in this process(More)
Post-translational modification of proteins with ubiquitin (Ub) and Ub chains controls numerous biochemical events. Although it has been proven that all Ub-Ub linkages are formed in cells, studies have been limited for a long time to K48 and K63 chains as these can be generated biochemically. Access to the remaining (atypical) Ub-Ub chain types has been(More)
Ubiquitin (Ub) is a small post-translational modifier protein involved in a myriad of biochemical processes including DNA damage repair, proteasomal proteolysis, and cell cycle control. Ubiquitin signaling pathways have not been completely deciphered due to the complex nature of the enzymes involved in ubiquitin conjugation and deconjugation. Hence, probes(More)
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