4fe2

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==X-Ray Structure of SAICAR Synthetase (PurC) from Streptococcus pneumoniae complexed with AIR, ADP, Asp and Mg2+==
==X-Ray Structure of SAICAR Synthetase (PurC) from Streptococcus pneumoniae complexed with AIR, ADP, Asp and Mg2+==
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<StructureSection load='4fe2' size='340' side='right' caption='[[4fe2]], [[Resolution|resolution]] 2.29&Aring;' scene=''>
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<StructureSection load='4fe2' size='340' side='right'caption='[[4fe2]], [[Resolution|resolution]] 2.29&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[4fe2]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"diplococcus_pneumoniae"_(klein_1884)_weichselbaum_1886 "diplococcus pneumoniae" (klein 1884) weichselbaum 1886]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4FE2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4FE2 FirstGlance]. <br>
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<table><tr><td colspan='2'>[[4fe2]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_pneumoniae Streptococcus pneumoniae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4FE2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4FE2 FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=144:TRIS-HYDROXYMETHYL-METHYL-AMMONIUM'>144</scene>, <scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=AIR:5-AMINOIMIDAZOLE+RIBONUCLEOTIDE'>AIR</scene>, <scene name='pdbligand=ASP:ASPARTIC+ACID'>ASP</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
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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]] 2.288&#8491;</td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">purC, SP_0044 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1313 "Diplococcus pneumoniae" (Klein 1884) Weichselbaum 1886])</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=144:TRIS-HYDROXYMETHYL-METHYL-AMMONIUM'>144</scene>, <scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=AIR:5-AMINOIMIDAZOLE+RIBONUCLEOTIDE'>AIR</scene>, <scene name='pdbligand=ASP:ASPARTIC+ACID'>ASP</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
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<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Phosphoribosylaminoimidazolesuccinocarboxamide_synthase Phosphoribosylaminoimidazolesuccinocarboxamide synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.3.2.6 6.3.2.6] </span></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=4fe2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4fe2 OCA], [https://pdbe.org/4fe2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4fe2 RCSB], [https://www.ebi.ac.uk/pdbsum/4fe2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4fe2 ProSAT]</span></td></tr>
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<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=4fe2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4fe2 OCA], [http://pdbe.org/4fe2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4fe2 RCSB], [http://www.ebi.ac.uk/pdbsum/4fe2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4fe2 ProSAT]</span></td></tr>
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</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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[https://www.uniprot.org/uniprot/PUR7_STRPN PUR7_STRPN]
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Streptococcus pneumoniae is a multidrug-resistant pathogen that is a target of considerable interest for antibacterial drug development. One strategy for drug discovery is to inhibit an essential metabolic enzyme. The seventh step of the de novo purine-biosynthesis pathway converts carboxyaminoimidazoleribonucleotide (CAIR) and L-aspartic acid (Asp) to 4-(N-succino)-5-aminoimidazole-4-carboxamide ribonucleotide (SAICAR) in the presence of adenosine 5'-triphosphate (ATP) using the enzyme PurC. PurC has been shown to be conditionally essential for bacterial replication. Two crystal structures of this essential enzyme from Streptococcus pneumoniae (spPurC) in the presence of adenosine 5'-diphosphate (ADP), Mg(2+), aminoimidazoleribonucleotide (AIR) and/or Asp have been obtained. This is the first structural study of spPurC, as well as the first of PurC from any species with Asp in the active site. Based on these findings, two model structures are proposed for the active site with all of the essential ligands (ATP, Mg(2+), Asp and CAIR) present, and a relay mechanism for the formation of the product SAICAR is suggested.
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Structures of SAICAR synthetase (PurC) from Streptococcus pneumoniae with ADP, Mg(2+), AIR and Asp.,Wolf NM, Abad-Zapatero C, Johnson ME, Fung LW Acta Crystallogr D Biol Crystallogr. 2014 Mar;70(Pt 3):841-50. doi:, 10.1107/S139900471303366X. Epub 2014 Feb 22. PMID:24598753<ref>PMID:24598753</ref>
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==See Also==
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*[[SAICAR synthetase|SAICAR synthetase]]
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 4fe2" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Phosphoribosylaminoimidazolesuccinocarboxamide synthase]]
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[[Category: Large Structures]]
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[[Category: Abad-Zapatero, C]]
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[[Category: Streptococcus pneumoniae]]
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[[Category: Fung, L M.W]]
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[[Category: Abad-Zapatero C]]
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[[Category: Johnson, M E]]
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[[Category: Fung LM-W]]
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[[Category: Wolf, N]]
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[[Category: Johnson ME]]
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[[Category: Alpha/beta protein]]
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[[Category: Wolf N]]
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[[Category: Asp]]
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[[Category: Cair]]
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[[Category: Ligase]]
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[[Category: Saicar synthetase]]
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Current revision

X-Ray Structure of SAICAR Synthetase (PurC) from Streptococcus pneumoniae complexed with AIR, ADP, Asp and Mg2+

PDB ID 4fe2

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