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From Proteopedia
Crystal structure of the Zn-bound ubiquitin-conjugating enzyme Ube2T
Structural highlights
FunctionUBE2T_HUMAN Accepts ubiquitin from the E1 complex and catalyzes its covalent attachment to other proteins. Catalyzes monoubiquitination. Involved in mitomycin-C (MMC)-induced DNA repair: acts as a specific E2 ubiquitin-conjugating enzyme for the Fanconi anemia complex by associating with E3 ubiquitin-protein ligase FANCL and catalyzing monoubiquitination of FANCD2, a key step in the DNA damage pathway. Also mediates monoubiquitination of FANCL and FANCI. May contribute to ubiquitination and degradation of BRCA1. In vitro able to promote polyubiquitination using all 7 ubiquitin Lys residues, but may prefer 'Lys-11'-, 'Lys-27'-, 'Lys-48'- and 'Lys-63'-linked polyubiquitination.[1] [2] [3] [4] [5] [6] Publication Abstract from PubMedEfforts to develop inhibitors, activators, and effectors of biological reactions using small molecule libraries are often hampered by interference compounds, artifacts, and false positives that permeate the pool of initial hits. Here, we report the discovery of a promising initial hit compound targeting the Fanconi anemia ubiquitin-conjugating enzyme Ube2T and describe its biophysical and biochemical characterization. Analysis of the co-crystal structure led to the identification of a contaminating zinc ion as solely responsible for the observed effects. Zinc binding to the active site cysteine induces a domain swap in Ube2T that leads to cyclic trimerization organized in an open-ended linear assembly. Our study serves as a cautionary tale for screening small molecule libraries and provides insights into the structural plasticity of ubiquitin-conjugating enzymes. Mind the Metal: A Fragment Library-Derived Zinc Impurity Binds the E2 Ubiquitin-Conjugating Enzyme Ube2T and Induces Structural Rearrangements.,Morreale FE, Testa A, Chaugule VK, Bortoluzzi A, Ciulli A, Walden H J Med Chem. 2017 Oct 3. doi: 10.1021/acs.jmedchem.7b01071. PMID:28933844[7] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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