View source for 3mbi


==Crystal structure of the phosphoribosylpyrophosphate (PRPP) synthetase from Thermoplasma volcanium in complex with ADP-Mg2+ and ribose 5-phosphate==
<StructureSection load='3mbi' size='340' side='right'caption='[[3mbi]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3mbi]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermoplasma_volcanium Thermoplasma volcanium]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3MBI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3MBI 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]] 1.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=HSX:5-O-PHOSPHONO-ALPHA-D-RIBOFURANOSE'>HSX</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=3mbi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3mbi OCA], [https://pdbe.org/3mbi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3mbi RCSB], [https://www.ebi.ac.uk/pdbsum/3mbi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3mbi ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/KPRS_THEVO KPRS_THEVO] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Phosphoribosyl pyrophosphate (PRPP) synthetase catalyzes the transfer of the pyrophosphate group from ATP to ribose-5-phosphate (R5P) yielding PRPP and AMP. PRPP is an essential metabolite that plays a central role in cellular metabolism. The enzyme from a thermophilic archaeon Thermoplasma volcanium (Tv) was expressed in Escherichia coli, crystallized, and its X-ray molecular structure was determined in a complex with its substrate R5P and with substrate analogs beta,gamma-methylene ATP and ADP in two monoclinic crystal forms, P2(1). The beta,gamma-methylene ATP- and the ADP-bound binary structures were determined from crystals grown from ammonium sulfate solutions; these crystals diffracted to 1.8 A and 1.5 A resolutions, respectively. Crystals of the ternary complex with ADP-Mg(2+) and R5P were grown from a polyethylene glycol solution in the absence of sulfate ions, and they diffracted to 1.8 A resolution; the unit cell is approximately double the size of the unit cell of the crystals grown in the presence of sulfate. The Tv PRPP synthetase adopts two conformations, open and closed, at different stages in the catalytic cycle. The binding of substrates, R5P and ATP, occurs with PRPP synthetase in the open conformation, whereas catalysis presumably takes place with PRPP synthetase in the closed conformation. The Tv PRPP synthetase forms a biological dimer in contrast to the tetrameric or hexameric quaternary structures of the Methanocaldococcus jannaschii and Bacillus subtilis PRPP synthetases, respectively.

The structures of Thermoplasma volcanium phosphoribosyl pyrophosphate synthetase bound to ribose-5-phosphate and ATP analogs.,Cherney MM, Cherney LT, Garen CR, James MN J Mol Biol. 2011 Nov 4;413(4):844-56. Epub 2011 Sep 21. PMID:21963988<ref>PMID:21963988</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3mbi" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Thermoplasma volcanium]]
[[Category: Cherney LT]]
[[Category: Cherney MM]]
[[Category: Garen CR]]
[[Category: James MNG]]