2i1a

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[[Image:2i1a.jpg|left|200px]]
 
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==A Retroviral Protease-Like Domain in the Eukaryotic Protein Ddi1==
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The line below this paragraph, containing "STRUCTURE_2i1a", creates the "Structure Box" on the page.
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<StructureSection load='2i1a' size='340' side='right'caption='[[2i1a]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[2i1a]] is a 4 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=2I1A OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2I1A FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.3&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2i1a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2i1a OCA], [https://pdbe.org/2i1a PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2i1a RCSB], [https://www.ebi.ac.uk/pdbsum/2i1a PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2i1a ProSAT]</span></td></tr>
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{{STRUCTURE_2i1a| PDB=2i1a | SCENE= }}
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</table>
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== Function ==
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'''A Retroviral Protease-Like Domain in the Eukaryotic Protein Ddi1'''
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[https://www.uniprot.org/uniprot/DDI1_YEAST DDI1_YEAST] Acts as a linker between the 19S proteasome and polyubiquitinated proteins like the HO endonuclease and UFO1 via UBA domain interactions with ubiquitin for their subsequent degradation. Required for S-phase checkpoint control. Appears to act as negative regulator of constitutive exocytosis. May act at the level of secretory vesicle docking and fusion as a competitive inhibitor of SNARE assembly.<ref>PMID:10330187</ref> <ref>PMID:11238935</ref> <ref>PMID:12051757</ref> <ref>PMID:12925750</ref> <ref>PMID:15964793</ref> <ref>PMID:17144915</ref> <ref>PMID:16478980</ref>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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==Overview==
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Check<jmol>
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Retroviral aspartyl proteases are homodimeric, whereas eukaryotic aspartyl proteases tend to be large, monomeric enzymes with 2-fold internal symmetry. It has been proposed that contemporary monomeric aspartyl proteases evolved by gene duplication and fusion from a primordial homodimeric enzyme. Recent sequence analyses have suggested that such "fossil" dimeric aspartyl proteases are still encoded in the eukaryotic genome. We present evidence for retention of a dimeric aspartyl protease in eukaryotes. The X-ray crystal structure of a domain of the Saccharomyces cerevisiae protein Ddi1 shows that it is a dimer with a fold similar to that of the retroviral proteases. Furthermore, the double Asp-Thr-Gly-Ala amino acid sequence motif at the active site of HIV protease is found with identical geometry in the Ddi1 structure. However, the putative substrate binding groove is wider in Ddi1 than in the retroviral proteases, suggesting that Ddi1 accommodates bulkier substrates. Ddi1 belongs to a family of proteins known as the ubiquitin receptors, which have in common the ability to bind ubiquitinated substrates and the proteasome. Ubiquitin receptors contain an amino-terminal ubiquitin-like (UBL) domain and a carboxy-terminal ubiquitin-associated (UBA) domain, but Ddi1 is the only representative in which the UBL and UBA domains flank an aspartyl protease-like domain. The remarkable structural similarity between the central domain of Ddi1 and the retroviral proteases, in the global fold and in active-site detail, suggests that Ddi1 functions proteolytically during regulated protein turnover in the cell.
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/i1/2i1a_consurf.spt"</scriptWhenChecked>
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==About this Structure==
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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2I1A 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=2I1A OCA].
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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==Reference==
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</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=2i1a ConSurf].
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Ddi1, a eukaryotic protein with the retroviral protease fold., Sirkis R, Gerst JE, Fass D, J Mol Biol. 2006 Dec 1;364(3):376-87. Epub 2006 Sep 3. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17010377 17010377]
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<div style="clear:both"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Saccharomyces cerevisiae]]
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[[Category: Single protein]]
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[[Category: Fass D]]
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[[Category: Fass, D.]]
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[[Category: Sirkis R]]
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[[Category: Sirkis, R.]]
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[[Category: Acid protease fold]]
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[[Category: Dimer]]
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[[Category: Retroviral protease domain]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 06:57:25 2008''
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Current revision

A Retroviral Protease-Like Domain in the Eukaryotic Protein Ddi1

PDB ID 2i1a

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