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[[Image:1g6y.jpg|left|200px]]


{{Structure
==CRYSTAL STRUCTURE OF THE GLOBULAR REGION OF THE PRION PROTEIN URE2 FROM YEAST SACCHAROMYCES CEREVISIAE==
|PDB= 1g6y |SIZE=350|CAPTION= <scene name='initialview01'>1g6y</scene>, resolution 2.8&Aring;
<StructureSection load='1g6y' size='340' side='right'caption='[[1g6y]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND=  
<table><tr><td colspan='2'>[[1g6y]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G6Y OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1G6Y FirstGlance]. <br>
|ACTIVITY=  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8&#8491;</td></tr>
|GENE= URE2 OR YNL229C OR N1165 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 Saccharomyces cerevisiae])
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1g6y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g6y OCA], [https://pdbe.org/1g6y PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1g6y RCSB], [https://www.ebi.ac.uk/pdbsum/1g6y PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1g6y ProSAT]</span></td></tr>
}}
</table>
== Function ==
[https://www.uniprot.org/uniprot/URE2_YEAST URE2_YEAST] Plays an important role in nitrogen catabolite repression. Down-regulates the expression of many genes involved in nitrogen utilization by inhibiting the GATA transcriptional activators GLN3 and GAT1. Under good nitrogen conditions, binds to the phosphorylated forms of GLN3 and GAT1 and sequesters them in the cytoplasm, preventing transcription of genes expressed upon nitrogen limitation. Is also an atypical glutaredoxin without a catalytical cysteine residue. Has glutathione peroxidase and thiol:disulfide oxidoreductase activities in both native and fibrillar form. Also shows insulin disulfide reductase and dehydroascorbic acid reductase (DHAR) actvites.<ref>PMID:1990286</ref> <ref>PMID:8755910</ref> <ref>PMID:10604478</ref> <ref>PMID:10799523</ref> <ref>PMID:15371425</ref> <ref>PMID:19321443</ref>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/g6/1g6y_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1g6y ConSurf].
<div style="clear:both"></div>


'''CRYSTAL STRUCTURE OF THE GLOBULAR REGION OF THE PRION PROTIEN URE2 FROM YEAST SACCHAROMYCES CEREVISIAE'''
==See Also==
 
*[[Prion 3D structures|Prion 3D structures]]
 
== References ==
==Overview==
<references/>
BACKGROUND: The [URE3] non-Mendelian element of the yeast S. cerevisiae is due to the propagation of a transmissible form of the protein Ure2. The infectivity of Ure2p is thought to originate from a conformational change of the normal form of the prion protein. This conformational change generates a form of Ure2p that assembles into amyloid fibrils. Hence, knowledge of the three-dimensional structure of prion proteins such as Ure2p should help in understanding the mechanism of amyloid formation associated with a number of neurodegenerative diseases. RESULTS: Here we report the three-dimensional crystal structure of the globular region of Ure2p (residues 95--354), also called the functional region, solved at 2.5 A resolution by the MAD method. The structure of Ure2p 95--354 shows a two-domain protein forming a globular dimer. The N-terminal domain is composed of a central 4 strand beta sheet flanked by four alpha helices, two on each side. In contrast, the C-terminal domain is entirely alpha-helical. The fold of Ure2p 95--354 resembles that of the beta class glutathione S-transferases (GST), in line with a weak similarity in the amino acid sequence that exists between these proteins. Ure2p dimerizes as GST does and possesses a potential ligand binding site, although it lacks GST activity. CONCLUSIONS: The structure of the functional region of Ure2p is the first crystal structure of a prion protein. Structure comparisons between Ure2p 95--354 and GST identified a 32 amino acid residues cap region in Ure2p exposed to the solvent. The cap region is highly flexible and may interact with the N-terminal region of the partner subunit in the dimer. The implication of this interaction in the assembly of Ure2p into amyloid fibrils is discussed.
__TOC__
 
</StructureSection>
==About this Structure==
[[Category: Large Structures]]
1G6Y is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G6Y OCA].
 
==Reference==
Structure of the globular region of the prion protein Ure2 from the yeast Saccharomyces cerevisiae., Bousset L, Belrhali H, Janin J, Melki R, Morera S, Structure. 2001 Jan 10;9(1):39-46. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11342133 11342133]
[[Category: Saccharomyces cerevisiae]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Single protein]]
[[Category: Belrhali H]]
[[Category: Belrhali, H.]]
[[Category: Bousset L]]
[[Category: Bousset, L.]]
[[Category: Janin J]]
[[Category: Janin, J.]]
[[Category: Melki R]]
[[Category: Melki, R.]]
[[Category: Morera S]]
[[Category: Morera, S.]]
[[Category: gst superfamily]]
[[Category: structural genomic]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 11:19:02 2008''

Latest revision as of 10:23, 7 February 2024

CRYSTAL STRUCTURE OF THE GLOBULAR REGION OF THE PRION PROTEIN URE2 FROM YEAST SACCHAROMYCES CEREVISIAECRYSTAL STRUCTURE OF THE GLOBULAR REGION OF THE PRION PROTEIN URE2 FROM YEAST SACCHAROMYCES CEREVISIAE

Structural highlights

1g6y is a 2 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.8Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

URE2_YEAST Plays an important role in nitrogen catabolite repression. Down-regulates the expression of many genes involved in nitrogen utilization by inhibiting the GATA transcriptional activators GLN3 and GAT1. Under good nitrogen conditions, binds to the phosphorylated forms of GLN3 and GAT1 and sequesters them in the cytoplasm, preventing transcription of genes expressed upon nitrogen limitation. Is also an atypical glutaredoxin without a catalytical cysteine residue. Has glutathione peroxidase and thiol:disulfide oxidoreductase activities in both native and fibrillar form. Also shows insulin disulfide reductase and dehydroascorbic acid reductase (DHAR) actvites.[1] [2] [3] [4] [5] [6]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

References

  1. ↑ Coschigano PW, Magasanik B. The URE2 gene product of Saccharomyces cerevisiae plays an important role in the cellular response to the nitrogen source and has homology to glutathione s-transferases. Mol Cell Biol. 1991 Feb;11(2):822-32. PMID:1990286
  2. ↑ Blinder D, Coschigano PW, Magasanik B. Interaction of the GATA factor Gln3p with the nitrogen regulator Ure2p in Saccharomyces cerevisiae. J Bacteriol. 1996 Aug;178(15):4734-6. PMID:8755910
  3. ↑ Beck T, Hall MN. The TOR signalling pathway controls nuclear localization of nutrient-regulated transcription factors. Nature. 1999 Dec 9;402(6762):689-92. PMID:10604478 doi:http://dx.doi.org/10.1038/45287
  4. ↑ Cunningham TS, Andhare R, Cooper TG. Nitrogen catabolite repression of DAL80 expression depends on the relative levels of Gat1p and Ure2p production in Saccharomyces cerevisiae. J Biol Chem. 2000 May 12;275(19):14408-14. PMID:10799523
  5. ↑ Bai M, Zhou JM, Perrett S. The yeast prion protein Ure2 shows glutathione peroxidase activity in both native and fibrillar forms. J Biol Chem. 2004 Nov 26;279(48):50025-30. Epub 2004 Sep 15. PMID:15371425 doi:http://dx.doi.org/10.1074/jbc.M406612200
  6. ↑ Zhang ZR, Perrett S. Novel glutaredoxin activity of the yeast prion protein Ure2 reveals a native-like dimer within fibrils. J Biol Chem. 2009 May 22;284(21):14058-67. doi: 10.1074/jbc.M901189200. Epub 2009, Mar 25. PMID:19321443 doi:http://dx.doi.org/10.1074/jbc.M901189200

1g6y, resolution 2.80Å

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