4mdk | pdb_00004mdk

Cdc34-ubiquitin-CC0651 complex

spinqualitylabelsall models 4mdk, resolution 2.61Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4mdk is a 8 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: U94 Gene: CDC34, UBCH3, UBE2R1 (HUMAN), UBC (HUMAN) Activity: Ubiquitin--protein ligase, with EC number 6.3.2.19 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Weak protein interactions between ubiquitin and the ubiquitin-proteasome system (UPS) enzymes that mediate its covalent attachment to substrates serve to position ubiquitin for optimal catalytic transfer. We show that a small-molecule inhibitor of the E2 ubiquitin-conjugating enzyme Cdc34A, called CC0651, acts by trapping a weak interaction between ubiquitin and the E2 donor ubiquitin-binding site. A structure of the ternary CC0651-Cdc34A-ubiquitin complex reveals that the inhibitor engages a composite binding pocket formed from Cdc34A and ubiquitin. CC0651 also suppresses the spontaneous hydrolysis rate of the Cdc34A-ubiquitin thioester without decreasing the interaction between Cdc34A and the RING domain subunit of the E3 enzyme. Stabilization of the numerous other weak interactions between ubiquitin and UPS enzymes by small molecules may be a feasible strategy to selectively inhibit different UPS activities. E2 enzyme inhibition by stabilization of a low-affinity interface with ubiquitin.,Huang H, Ceccarelli DF, Orlicky S, St-Cyr DJ, Ziemba A, Garg P, Plamondon S, Auer M, Sidhu S, Marinier A, Kleiger G, Tyers M, Sicheri F Nat Chem Biol. 2013 Dec 15. doi: 10.1038/nchembio.1412. PMID:24316736 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ubiquitin conjugating enzyme

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