View source for 5a65


==Crystal structure of mouse thiamine triphosphatase in complex with thiamine diphosphate, orthophosphate and magnesium ions.==
<StructureSection load='5a65' size='340' side='right'caption='[[5a65]], [[Resolution|resolution]] 1.98&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5a65]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5A65 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5A65 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]] 1.98&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=TPP:THIAMINE+DIPHOSPHATE'>TPP</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=5a65 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5a65 OCA], [https://pdbe.org/5a65 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5a65 RCSB], [https://www.ebi.ac.uk/pdbsum/5a65 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5a65 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/THTPA_MOUSE THTPA_MOUSE] Hydrolase highly specific for thiamine triphosphate (ThTP) (By similarity).
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Triphosphate tunnel metalloenzymes (TTMs) are present in all kingdoms of life and catalyze diverse enzymatic reactions such as mRNA capping, the cyclization of adenosine triphosphate, the hydrolysis of thiamine triphosphate and the synthesis and breakdown of inorganic polyphosphates. TTMs have an unusual tunnel domain fold that harbors substrate- and metal co-factor binding sites. It is presently poorly understood how TTMs specifically sense different triphosphate-containing substrates and how catalysis occurs in the tunnel center. Here we describe substrate-bound structures of inorganic polyphosphatases from Arabidopsis and E. coli, which reveal an unorthodox yet conserved mode of triphosphate and metal co-factor binding. We identify two metal binding sites in these enzymes, with one co-factor involved in substrate coordination and the other in catalysis. Structural comparisons with a substrate- and product-bound mammalian thiamine triphosphatase, and with previously reported structures of mRNA capping enzymes, adenylate cyclases and polyphosphate polymerases, suggest that directionality of substrate binding defines TTM catalytic activity. Our work provides insight into the evolution and functional diversification of an ancient enzyme family.

Structural Determinants for Substrate Binding and Catalysis in Triphosphate Tunnel Metalloenzymes.,Martinez J, Truffault V, Hothorn M J Biol Chem. 2015 Jul 28. pii: jbc.M115.674473. PMID:26221030<ref>PMID:26221030</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5a65" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Hothorn M]]
[[Category: Martinez J]]
[[Category: Truffault V]]