5l6j
Uba1 in complex with Ub-MLN7243 covalent adduct
Structural highlights
FunctionUBA1_YEAST Activates ubiquitin by first adenylating its C-terminal glycine residue with ATP, and thereafter linking this residue to the side chain of a cysteine residue in E1, yielding an ubiquitin-E1 thioester and free AMP. Publication Abstract from PubMedTargeting the activating enzymes (E1) of ubiquitin (Ub) and ubiquitin-like modifiers (Ubls) has emerged as a promising anti-cancer strategy, possibly overcoming the ineffectiveness of proteasome inhibitors against solid tumors. Here, we report crystal structures of the yeast ubiquitin E1 (Uba1) with three adenosyl sulfamate inhibitors exhibiting different E1 specificities, which are all covalently linked to ubiquitin. The structures illustrate how the chemically diverse inhibitors are accommodated within the adenylation active site. When compared with the previously reported structures of various E1 enzymes, our structures provide the basis of the preferences of these inhibitors for different Ub/Ubl-activating enzymes. In vitro inhibition assays and molecular dynamics simulations validated the specificities of the inhibitors as deduced from the structures. Taken together, the structures establish a framework for the development of additional compounds targeting E1 enzymes, which will display higher potency and selectivity. Dissecting the Specificity of Adenosyl Sulfamate Inhibitors Targeting the Ubiquitin-Activating Enzyme.,Misra M, Kuhn M, Lobel M, An H, Statsyuk AV, Sotriffer C, Schindelin H Structure. 2017 Jul 5;25(7):1120-1129.e3. doi: 10.1016/j.str.2017.05.001. Epub, 2017 Jun 1. PMID:28578874[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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