Essentiality of a non-RING element in priming donor ubiquitin for catalysis by a monomeric E3
| Autor: | Lori Buetow, Hao Dou, Danny T. Huang, Gary J. Sibbet, Kenneth Cameron |
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| Rok vydání: | 2013 |
| Předmět: |
Models
Molecular CBL Magnetic Resonance Spectroscopy Protein Conformation Protein subunit Molecular Sequence Data monomeric Ubiquitin-conjugating enzyme Ring (chemistry) Article Canonical ring Protein structure E2 Ubiquitin Structural Biology Humans Amino Acid Sequence Proto-Oncogene Proteins c-cbl RING E3 Molecular Biology Adaptor Proteins Signal Transducing chemistry.chemical_classification DNA ligase biology phosphorylation Kinetics Crystallography chemistry Ubiquitin-Conjugating Enzymes Domain (ring theory) biology.protein Crystallization Sequence Alignment |
| Zdroj: | Nature structural & molecular biology |
| ISSN: | 1545-9985 1545-9993 |
| DOI: | 10.1038/nsmb.2621 |
| Popis: | RING E3 ligases catalyze the transfer of ubiquitin (Ub) from E2 ubiquitin-conjugating enzyme thioesterified with Ub (E2~Ub) to substrate. For RING E3 dimers, the RING domain of one subunit and tail of the second cooperate to prime Ub, but how this is accomplished by monomeric RING E3s in the absence of a tail-like component is currently unknown. Here, we present a crystal structure of a monomeric RING E3, Tyr363-phosphorylated human CBL-B, bound to a stabilized Ub-linked E2, revealing a similar mechanism in activating E2~Ub. Both pTyr363 and the pTyr363-induced element interact directly with Ub's Ile36 surface, improving the catalytic efficiency of Ub transfer by ~200-fold. Hence, interactions outside the canonical RING domain are crucial for optimizing Ub transfer in both monomeric and dimeric RING E3s. We propose that an additional non-RING Ub-priming element may be a common RING E3 feature. |
| Databáze: | OpenAIRE |
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