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New page: left|200px<br /><applet load="1ppy" size="450" color="white" frame="true" align="right" spinBox="true" caption="1ppy, resolution 1.95Å" /> '''Native precursor of ... |
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== | ==Native precursor of pyruvoyl dependent Aspartate decarboxylase== | ||
Aspartate decarboxylase, which is translated as a pro-protein, undergoes | <StructureSection load='1ppy' size='340' side='right'caption='[[1ppy]], [[Resolution|resolution]] 1.95Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1ppy]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PPY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1PPY FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.95Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CSX:S-OXY+CYSTEINE'>CSX</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1ppy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ppy OCA], [https://pdbe.org/1ppy PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ppy RCSB], [https://www.ebi.ac.uk/pdbsum/1ppy PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ppy ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/PAND_ECOLI PAND_ECOLI] Catalyzes the pyruvoyl-dependent decarboxylation of aspartate to produce beta-alanine.<ref>PMID:6767707</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/pp/1ppy_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=1ppy ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Aspartate decarboxylase, which is translated as a pro-protein, undergoes intramolecular self-cleavage at Gly24-Ser25. We have determined the crystal structures of an unprocessed native precursor, in addition to Ala24 insertion, Ala26 insertion and Gly24-->Ser, His11-->Ala, Ser25-->Ala, Ser25-->Cys and Ser25-->Thr mutants. Comparative analyses of the cleavage site reveal specific conformational constraints that govern self-processing and demonstrate that considerable rearrangement must occur. We suggest that Thr57 Ogamma and a water molecule form an 'oxyanion hole' that likely stabilizes the proposed oxyoxazolidine intermediate. Thr57 and this water molecule are probable catalytic residues able to support acid-base catalysis. The conformational freedom in the loop preceding the cleavage site appears to play a determining role in the reaction. The molecular mechanism of self-processing, presented here, emphasizes the importance of stabilization of the oxyoxazolidine intermediate. Comparison of the structural features shows significant similarity to those in other self-processing systems, and suggests that models of the cleavage site of such enzymes based on Ser-->Ala or Ser-->Thr mutants alone may lead to erroneous interpretations of the mechanism. | |||
Structural constraints on protein self-processing in L-aspartate-alpha-decarboxylase.,Schmitzberger F, Kilkenny ML, Lobley CM, Webb ME, Vinkovic M, Matak-Vinkovic D, Witty M, Chirgadze DY, Smith AG, Abell C, Blundell TL EMBO J. 2003 Dec 1;22(23):6193-204. PMID:14633979<ref>PMID:14633979</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
[[ | <div class="pdbe-citations 1ppy" style="background-color:#fffaf0;"></div> | ||
==See Also== | |||
*[[Aspartate decarboxylase 3D structures|Aspartate decarboxylase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Abell | [[Category: Abell C]] | ||
[[Category: Blundell | [[Category: Blundell TL]] | ||
[[Category: Chirgadze | [[Category: Chirgadze DY]] | ||
[[Category: Kilkenny | [[Category: Kilkenny ML]] | ||
[[Category: Lobley | [[Category: Lobley CMC]] | ||
[[Category: Matak-Vinkovic | [[Category: Matak-Vinkovic D]] | ||
[[Category: Schmitzberger | [[Category: Schmitzberger F]] | ||
[[Category: Smith | [[Category: Smith AG]] | ||
[[Category: Vinkovic | [[Category: Vinkovic M]] | ||
[[Category: Webb | [[Category: Webb ME]] | ||
[[Category: Witty | [[Category: Witty M]] | ||
Latest revision as of 12:46, 16 August 2023
Native precursor of pyruvoyl dependent Aspartate decarboxylaseNative precursor of pyruvoyl dependent Aspartate decarboxylase
Structural highlights
FunctionPAND_ECOLI Catalyzes the pyruvoyl-dependent decarboxylation of aspartate to produce beta-alanine.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedAspartate decarboxylase, which is translated as a pro-protein, undergoes intramolecular self-cleavage at Gly24-Ser25. We have determined the crystal structures of an unprocessed native precursor, in addition to Ala24 insertion, Ala26 insertion and Gly24-->Ser, His11-->Ala, Ser25-->Ala, Ser25-->Cys and Ser25-->Thr mutants. Comparative analyses of the cleavage site reveal specific conformational constraints that govern self-processing and demonstrate that considerable rearrangement must occur. We suggest that Thr57 Ogamma and a water molecule form an 'oxyanion hole' that likely stabilizes the proposed oxyoxazolidine intermediate. Thr57 and this water molecule are probable catalytic residues able to support acid-base catalysis. The conformational freedom in the loop preceding the cleavage site appears to play a determining role in the reaction. The molecular mechanism of self-processing, presented here, emphasizes the importance of stabilization of the oxyoxazolidine intermediate. Comparison of the structural features shows significant similarity to those in other self-processing systems, and suggests that models of the cleavage site of such enzymes based on Ser-->Ala or Ser-->Thr mutants alone may lead to erroneous interpretations of the mechanism. Structural constraints on protein self-processing in L-aspartate-alpha-decarboxylase.,Schmitzberger F, Kilkenny ML, Lobley CM, Webb ME, Vinkovic M, Matak-Vinkovic D, Witty M, Chirgadze DY, Smith AG, Abell C, Blundell TL EMBO J. 2003 Dec 1;22(23):6193-204. PMID:14633979[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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