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==Structures of SAICAR Synthetase (PurC) from Streptococcus pneumoniae with ADP, Mg2+, AIR and L-Asp==
<StructureSection load='4nye' size='340' side='right'caption='[[4nye]], [[Resolution|resolution]] 2.69&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4nye]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_pneumoniae_TIGR4 Streptococcus pneumoniae TIGR4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4NYE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4NYE 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]] 2.69&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=4nye FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4nye OCA], [https://pdbe.org/4nye PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4nye RCSB], [https://www.ebi.ac.uk/pdbsum/4nye PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4nye ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PUR7_STRPN PUR7_STRPN] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
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.

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>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4nye" style="background-color:#fffaf0;"></div>

==See Also==
*[[SAICAR synthetase|SAICAR synthetase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptococcus pneumoniae TIGR4]]
[[Category: Abad-Zapatero C]]
[[Category: Fung LW-M]]
[[Category: Johnson ME]]
[[Category: Wolf NM]]