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2qiz

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{{STRUCTURE_2qiz| PDB=2qiz | SCENE= }}
{{STRUCTURE_2qiz| PDB=2qiz | SCENE= }}
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'''Structure of the yeast U-box-containing ubiquitin ligase Ufd2p'''
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===Structure of the yeast U-box-containing ubiquitin ligase Ufd2p===
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==Overview==
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Proteins conjugated by Lys-48-linked polyubiquitin chains are preferred substrates of the eukaryotic proteasome. Polyubiquitination requires an activating enzyme (E1), a conjugating enzyme (E2), and a ligase (E3). Occasionally, these enzymes only assemble short ubiquitin oligomers, and their extension to full length involves a ubiquitin elongating factor termed E4. Ufd2p, as the first E4 identified to date, is involved in the degradation of misfolded proteins of the endoplasmic reticulum and of a ubiquitin-beta-GAL fusion substrate in Saccharomyces cerevisiae. The mechanism of action of Ufd2p is unknown. Here we describe the crystal structure of the full-length yeast Ufd2p protein. Ufd2p has an elongated shape consisting of several irregular Armadillo-like repeats with two helical hairpins protruding from it and a U-box domain flexibly attached to its C terminus. The U-box of Ufd2p has a fold similar to that of the RING (Really Interesting New Gene) domain that is present in certain ubiquitin ligases. Accordingly, Ufd2p has all of the hallmarks of a RING finger-containing ubiquitin ligase: it associates with its cognate E2 Ubc4p via its U-box domain and catalyzes the transfer of ubiquitin from the E2 active site to Ufd2p itself or to an acceptor ubiquitin molecule to form unanchored diubiquitin oligomers. Thus, Ufd2p can function as a bona fide E3 ubiquitin ligase to promote ubiquitin chain elongation on a substrate.
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(as it appears on PubMed at http://www.pubmed.gov), where 17890322 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17890322}}
==About this Structure==
==About this Structure==
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[[Category: Helical hairpin]]
[[Category: Helical hairpin]]
[[Category: Ligase]]
[[Category: Ligase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 15:02:23 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 11:51:02 2008''

Revision as of 08:51, 29 July 2008

Image:2qiz.png

Template:STRUCTURE 2qiz

Structure of the yeast U-box-containing ubiquitin ligase Ufd2p

Template:ABSTRACT PUBMED 17890322

About this Structure

2QIZ is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.

Reference

Inaugural Article: Structure and function of the yeast U-box-containing ubiquitin ligase Ufd2p., Tu D, Li W, Ye Y, Brunger AT, Proc Natl Acad Sci U S A. 2007 Oct 2;104(40):15599-606. Epub 2007 Sep 21. PMID:17890322

Page seeded by OCA on Tue Jul 29 11:51:02 2008

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