2qiy
From Proteopedia
yeast Deubiquitinase Ubp3 and Bre5 cofactor complex
Structural highlights
Function[BRE5_YEAST] Has a role in de-ubiquitination. In conjunction with UBP3, cleaves ubiquitin, leading to the subsequent mono-ubiquitination of sec23.[1] [UBP3_YEAST] Has an ATP-independent isopeptidase activity, cleaving at the C-terminus of the ubiquitin moiety in natural or engineered linear fusion proteins, irrespective of their size or the presence of an N-terminal extension to ubiquitin. Plays a role in regulation of silencing by interacting with SIR4. Also, in conjunction with BRE5, cleaves ubiquitin, leading to the subsequent mono-ubiquitination of SEC23.[2] [3] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedYeast Ubp3 and its co-factor Bre5 form a deubiquitylation complex to regulate protein transport between the endoplasmic reticulum and Golgi compartments of the cell. A novel N-terminal domain of the Ubp3 catalytic subunit forms a complex with the NTF2-like domain of the Bre5 regulatory subunit. Here, we report the X-ray crystal structure of an Ubp3-Bre5 complex and show that it forms a symmetric hetero-tetrameric complex in which the Bre5 NTF2-like domain dimer interacts with two L-shaped beta-strand-turn-alpha-helix motifs of Ubp3. The Ubp3 N-terminal domain binds within a hydrophobic cavity on the surface of the Bre5 NTF2-like domain subunit with conserved residues within both proteins interacting predominantly through antiparallel beta-sheet hydrogen bonds and van der Waals contacts. Structure-based mutagenesis and functional studies confirm the significance of the observed interactions for Ubp3-Bre5 association in vitro and Ubp3 function in vivo. Comparison of the structure to other protein complexes with NTF2-like domains shows that the Ubp3-Bre5 interface is novel. Together, these studies provide new insights into Ubp3 recognition by Bre5 and into protein recognition by NTF2-like domains. Molecular basis for bre5 cofactor recognition by the ubp3 deubiquitylating enzyme.,Li K, Ossareh-Nazari B, Liu X, Dargemont C, Marmorstein R J Mol Biol. 2007 Sep 7;372(1):194-204. Epub 2007 Jun 27. PMID:17632125[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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