3m31

From Proteopedia

(Difference between revisions)

Revision as of 13:43, 24 December 2014

Structure of the C150A/C295A mutant of S. cerevisiae Ero1p

Structural highlights

3m31 is a 1 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, ,
Related:	1rp4, 1rq1
Gene:	ERO1 (Saccharomyces cerevisiae)
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[ERO1_YEAST] Essential oxidoreductase that oxidizes proteins in the endoplasmic reticulum to produce disulfide bonds. Acts by oxidizing directly PDI1 isomerase through a direct disulfide exchange. Does not act as a direct oxidant of folding substrate, but relies on PDI1 to transfer oxidizing equivalent. Also able to oxidize directly the PDI related protein MPD2. Does not oxidize all PDI related proteins, suggesting that it can discriminate between PDI1 and related proteins. Reoxidation of ERO1 probably involves electron transfer to molecular oxygen via FAD. Acts independently of glutathione. May be responsible for a significant proportion of reactive oxygen species (ROS) in the cell, thereby being a source of oxidative stress.^[1] ^[2] ^[3] ^[4] ^[5]

Publication Abstract from PubMed

Ero1p is the primary catalyst of disulfide bond formation in the yeast endoplasmic reticulum (ER). Ero1p contains a pair of essential disulfide bonds that participate directly in the electron transfer pathway from substrate thiol groups to oxygen. Remarkably, elimination of certain other Ero1p disulfides by mutation enhances enzyme activity. In particular, the C150A/C295A Ero1p mutant exhibits increased thiol oxidation in vitro and in vivo and interferes with redox homeostasis in yeast cells by hyperoxidizing the ER. Inhibitory disulfides of Ero1p are thus important for enzyme regulation. To visualize the differences between de-regulated and wild-type Ero1p, we determined the crystal structure of Ero1p C150A/C295A. The structure revealed local changes compared to the wild-type enzyme around the sites of mutation, but no conformational transitions within 25 A of the active site were observed. To determine how the C150--C295 disulfide nonetheless participates in redox regulation of Ero1p, we analyzed using mass spectrometry the changes in Ero1p disulfide connectivity as a function of time after encounter with reducing substrates. We found that the C150--C295 disulfide sets a physiologically appropriate threshold for enzyme activation by guarding a key neighboring disulfide from reduction. This study illustrates the diverse and interconnected roles that disulfides can play in redox regulation of protein activity.

Steps in reductive activation of the disulfide-generating enzyme Ero1p.,Heldman N, Vonshak O, Sevier CS, Vitu E, Mehlman T, Fass D Protein Sci. 2010 Oct;19(10):1863-76. PMID:20669236^[6]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Frand AR, Kaiser CA. The ERO1 gene of yeast is required for oxidation of protein dithiols in the endoplasmic reticulum. Mol Cell. 1998 Jan;1(2):161-70. PMID:9659913
↑ Pollard MG, Travers KJ, Weissman JS. Ero1p: a novel and ubiquitous protein with an essential role in oxidative protein folding in the endoplasmic reticulum. Mol Cell. 1998 Jan;1(2):171-82. PMID:9659914
↑ Frand AR, Kaiser CA. Ero1p oxidizes protein disulfide isomerase in a pathway for disulfide bond formation in the endoplasmic reticulum. Mol Cell. 1999 Oct;4(4):469-77. PMID:10549279
↑ Tu BP, Ho-Schleyer SC, Travers KJ, Weissman JS. Biochemical basis of oxidative protein folding in the endoplasmic reticulum. Science. 2000 Nov 24;290(5496):1571-4. PMID:11090354
↑ Tu BP, Weissman JS. The FAD- and O(2)-dependent reaction cycle of Ero1-mediated oxidative protein folding in the endoplasmic reticulum. Mol Cell. 2002 Nov;10(5):983-94. PMID:12453408
↑ Heldman N, Vonshak O, Sevier CS, Vitu E, Mehlman T, Fass D. Steps in reductive activation of the disulfide-generating enzyme Ero1p. Protein Sci. 2010 Oct;19(10):1863-76. PMID:20669236 doi:10.1002/pro.473

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3m31"

@@ Line 8: / Line 8: @@
 <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3m31 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3m31 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3m31 RCSB], [http://www.ebi.ac.uk/pdbsum/3m31 PDBsum]</span></td></tr>
 </table>
+== Function ==
+[[http://www.uniprot.org/uniprot/ERO1_YEAST ERO1_YEAST]] Essential oxidoreductase that oxidizes proteins in the endoplasmic reticulum to produce disulfide bonds. Acts by oxidizing directly PDI1 isomerase through a direct disulfide exchange. Does not act as a direct oxidant of folding substrate, but relies on PDI1 to transfer oxidizing equivalent. Also able to oxidize directly the PDI related protein MPD2. Does not oxidize all PDI related proteins, suggesting that it can discriminate between PDI1 and related proteins. Reoxidation of ERO1 probably involves electron transfer to molecular oxygen via FAD. Acts independently of glutathione. May be responsible for a significant proportion of reactive oxygen species (ROS) in the cell, thereby being a source of oxidative stress.<ref>PMID:9659913</ref> <ref>PMID:9659914</ref> <ref>PMID:10549279</ref> <ref>PMID:11090354</ref> <ref>PMID:12453408</ref>
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==

3m31

From Proteopedia

Revision as of 13:43, 24 December 2014

Structure of the C150A/C295A mutant of S. cerevisiae Ero1p

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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