2eke

Structure of a SUMO-binding-motif mimic bound to Smt3p-Ubc9p: conservation of a noncovalent Ubiquitin-like protein-E2 complex as a platform for selective interactions within a SUMO pathway

spinqualitylabelsall models 2eke, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2eke is a 4 chain structure with sequence from Atcc 18824. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1z5s, 1wyw, 1euv Gene: UBC9 (ATCC 18824), SMT3 (ATCC 18824) Activity: Ubiquitin--protein ligase, with EC number 6.3.2.19 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [UBC9_YEAST] E2 ubiquitin-like--protein ligase mediating SUMO/Smt3 attachment to septins and PCNA. Seems to be involved in degradation of S- (CLB5) and M-phase cyclins (CLB2). [SMT3_YEAST] Not known; suppressor of MIF2 mutations. 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 PubMed The SUMO ubiquitin-like proteins play regulatory roles in cell division, transcription, DNA repair, and protein subcellular localization. Paralleling other ubiquitin-like proteins, SUMO proteins are proteolytically processed to maturity, conjugated to targets by E1-E2-E3 cascades, and subsequently recognized by specific downstream effectors containing a SUMO-binding motif (SBM). SUMO and its E2 from the budding yeast Saccharomyces cerevisiae, Smt3p and Ubc9p, are encoded by essential genes. Here we describe the 1.9 A resolution crystal structure of a non-covalent Smt3p-Ubc9p complex. Unexpectedly, a heterologous portion of the crystallized complex derived from the expression construct mimics an SBM, and binds Smt3p in a manner resembling SBM binding to human SUMO family members. In the complex, Smt3p binds a surface distal from Ubc9's catalytic cysteine. The structure implies that a single molecule of Smt3p cannot bind concurrently to both the non-covalent binding site and the catalytic cysteine of a single Ubc9p molecule. However, formation of higher-order complexes can occur, where a single Smt3p covalently linked to one Ubc9p's catalytic cysteine also binds non-covalently to another molecule of Ubc9p. Comparison with other structures from the SUMO pathway suggests that formation of the non-covalent Smt3p-Ubc9p complex occurs mutually exclusively with many other Smt3p and Ubc9p interactions in the conjugation cascade. By contrast, high-resolution insights into how Smt3p-Ubc9p can also interact with downstream recognition machineries come from contacts with the SBM mimic. Interestingly, the overall architecture of the Smt3p-Ubc9p complex is strikingly similar to recent structures from the ubiquitin pathway. The results imply that non-covalent ubiquitin-like protein-E2 complexes are conserved platforms, which function as parts of larger assemblies involved in many protein post-translational regulatory pathways. Structure of a SUMO-binding-motif mimic bound to Smt3p-Ubc9p: conservation of a non-covalent ubiquitin-like protein-E2 complex as a platform for selective interactions within a SUMO pathway.,Duda DM, van Waardenburg RC, Borg LA, McGarity S, Nourse A, Waddell MB, Bjornsti MA, Schulman BA J Mol Biol. 2007 Jun 8;369(3):619-30. Epub 2007 Apr 10. PMID:17475278 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also SUMO 3D Structures SUMO conjugating enzyme Ubc9

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