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| {{STRUCTURE_1z5s| PDB=1z5s | SCENE= }} | | {{STRUCTURE_1z5s| PDB=1z5s | SCENE= }} |
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| '''Crystal structure of a complex between UBC9, SUMO-1, RANGAP1 and NUP358/RANBP2'''
| | ===Crystal structure of a complex between UBC9, SUMO-1, RANGAP1 and NUP358/RANBP2=== |
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| ==Overview==
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| SUMO-1 (for small ubiquitin-related modifier) belongs to the ubiquitin (Ub) and ubiquitin-like (Ubl) protein family. SUMO conjugation occurs on specific lysine residues within protein targets, regulating pathways involved in differentiation, apoptosis, the cell cycle and responses to stress by altering protein function through changes in activity or cellular localization or by protecting substrates from ubiquitination. Ub/Ubl conjugation occurs in sequential steps and requires the concerted action of E2 conjugating proteins and E3 ligases. In addition to being a SUMO E3, the nucleoporin Nup358/RanBP2 localizes SUMO-conjugated RanGAP1 to the cytoplasmic face of the nuclear pore complex by means of interactions in a complex that also includes Ubc9, the SUMO E2 conjugating protein. Here we describe the 3.0-A crystal structure of a four-protein complex of Ubc9, a Nup358/RanBP2 E3 ligase domain (IR1-M) and SUMO-1 conjugated to the carboxy-terminal domain of RanGAP1. Structural insights, combined with biochemical and kinetic data obtained with additional substrates, support a model in which Nup358/RanBP2 acts as an E3 by binding both SUMO and Ubc9 to position the SUMO-E2-thioester in an optimal orientation to enhance conjugation.
| | The line below this paragraph, {{ABSTRACT_PUBMED_15931224}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 15931224 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_15931224}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Sumo]] | | [[Category: Sumo]] |
| [[Category: Ubc9]] | | [[Category: Ubc9]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 17:12:20 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 03:51:54 2008'' |
