1mxf

<table><tr><td colspan='2'>[[1mxf]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Trycr Trycr]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MXF OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1MXF FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MTX:METHOTREXATE'>MTX</scene>, <scene name='pdbligand=NDP:NADPH+DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NDP</scene></td></tr>

<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1e7w|1e7w]], [[1e92|1e92]]</div></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ptr2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=5693 TRYCR])</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1mxf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mxf OCA], [http://pdbe.org/1mxf PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1mxf RCSB], [http://www.ebi.ac.uk/pdbsum/1mxf PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1mxf ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

Reduced pteridines are required for a number of important cellular functions. Trypanosomatid parasites, unlike their mammalian hosts, are pteridine auxotrophs and salvage the precursor pteridines from the host and reduce them to the respective biologically active tetrahydro forms using parasite-encoded enzymes. These enzymes may offer selective drug targets. In Leishmania, pteridine reductase 1 (PTR1), the primary enzyme for reducing pterins, is also responsible for resistance to antifolate drugs. Typically, PTR1 is more active with fully oxidized biopterin and folate than with their reduced counterparts. We have identified an enzyme, TcPTR2 of Trypanosoma cruzi, which though very similar to PTR1 in its primary sequence, can reduce only dihydrobiopterin and dihydrofolate and not oxidized pteridines. The structures of an inhibitor (methotrexate) and a substrate (dihydrofolate) complex of this enzyme demonstrate that the orientation of the substrate and the inhibitor in the active site of TcPTR2 are different from each other. However, the orientation of each ligand is similar to that of the corresponding ligand in Leishmania major PTR1 complexes.

Crystal structure of Trypanosoma cruzi pteridine reductase 2 in complex with a substrate and an inhibitor.,Schormann N, Pal B, Senkovich O, Carson M, Howard A, Smith C, Delucas L, Chattopadhyay D J Struct Biol. 2005 Oct;152(1):64-75. PMID:16168672<ref>PMID:16168672</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 1mxf" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Trycr]]

[[Category: Carson, M]]

[[Category: Chattopadhyay, D]]

[[Category: Delucas, L]]

[[Category: Howard, A]]

[[Category: Pal, B]]

[[Category: Schormann, N]]

[[Category: Senkovich, O]]

[[Category: Smith, C]]

[[Category: Sdr topology]]