View source for 1w19


==Lumazine Synthase from Mycobacterium tuberculosis bound to 3-(1,3,7- trihydro-9-D-ribityl-2,6,8-purinetrione-7-yl)propane 1-phosphate==
<StructureSection load='1w19' size='340' side='right'caption='[[1w19]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1w19]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1W19 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1W19 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&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACY:ACETIC+ACID'>ACY</scene>, <scene name='pdbligand=D1D:(4S,5S)-1,2-DITHIANE-4,5-DIOL'>D1D</scene>, <scene name='pdbligand=DTU:(2R,3S)-1,4-DIMERCAPTOBUTANE-2,3-DIOL'>DTU</scene>, <scene name='pdbligand=DTV:(2S,3S)-1,4-DIMERCAPTOBUTANE-2,3-DIOL'>DTV</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=T1P:3-{2,6,8-TRIOXO-9-[(2R,3S,4R)-2,3,4,5-TETRAHYDROXYPENTYL]-1,2,3,6,8,9-HEXAHYDRO-7H-PURIN-7-YL}PROPYL+DIHYDROGEN+PHOSPHATE'>T1P</scene>, <scene name='pdbligand=T2P:3-{2,6,8-TRIOXO-9-[(2S,3R,4R)-2,3,4,5-TETRAHYDROXYPENTYL]-1,2,3,6,8,9-HEXAHYDRO-7H-PURIN-7-YL}PROPYL+DIHYDROGEN+PHOSPHATE'>T2P</scene>, <scene name='pdbligand=T4P:3-{2,6,8-TRIOXO-9-[(2R,3R,4R)-2,3,4,5-TETRAHYDROXYPENTYL]-1,2,3,6,8,9-HEXAHYDRO-7H-PURIN-7-YL}PROPYL+DIHYDROGEN+PHOSPHATE'>T4P</scene>, <scene name='pdbligand=T5P:3-{2,6,8-TRIOXO-9-[(2S,3S,4R)-2,3,4,5-TETRAHYDROXYPENTYL]-1,2,3,6,8,9-HEXAHYDRO-7H-PURIN-7-YL}PROPYL+DIHYDROGEN+PHOSPHATE'>T5P</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=1w19 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1w19 OCA], [https://pdbe.org/1w19 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1w19 RCSB], [https://www.ebi.ac.uk/pdbsum/1w19 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1w19 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RISB_MYCTU RISB_MYCTU] Catalyzes the formation of 6,7-dimethyl-8-ribityllumazine by condensation of 5-amino-6-(D-ribitylamino)uracil with 3,4-dihydroxy-2-butanone 4-phosphate. This is the penultimate step in the biosynthesis of riboflavin.<ref>PMID:15723519</ref> 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/w1/1w19_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1w19 ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
The enzymes involved in the biosynthesis of riboflavin represent attractive targets for the development of drugs against bacterial pathogens, because the inhibitors of these enzymes are not likely to interfere with enzymes of the mammalian metabolism. Lumazine synthase catalyzes the penultimate step in the riboflavin biosynthesis pathway. A number of substituted purinetrione compounds represent a new class of highly specific inhibitors of lumazine synthase from Mycobacterium tuberculosis. To develop potent antibiotics for the treatment of tuberculosis, we have determined the structure of lumazine synthase from M. tuberculosis in complex with two purinetrione inhibitors and have studied binding via isothermal titration calorimetry. The structures were determined by molecular replacement using lumazine synthase from Saccharomyces cerevisiae as a search model and refined at 2 and 2.3 A resolution. The R-factors were 14.7 and 17.4%, respectively, and the R(free) values were 19.3 and 26.3%, respectively. The enzyme was found to be a pentamer consisting of five subunits related by 5-fold local symmetry. The comparison of the active site architecture with the active site of previously determined lumazine synthase structures reveals a largely conserved topology with the exception of residues Gln141 and Glu136, which participate in different charge-charge interactions in the core space of the active site. The impact of structural changes in the active site on the altered binding and catalytic properties of the enzyme is discussed. Isothermal titration calorimetry measurements indicate highly specific binding of the purinetrione inhibitors to the M. tuberculosis enzyme with dissociation constants in micromolar range.

Crystal structure of lumazine synthase from Mycobacterium tuberculosis as a target for rational drug design: binding mode of a new class of purinetrione inhibitors.,Morgunova E, Meining W, Illarionov B, Haase I, Jin G, Bacher A, Cushman M, Fischer M, Ladenstein R Biochemistry. 2005 Mar 1;44(8):2746-58. PMID:15723519<ref>PMID:15723519</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 1w19" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mycobacterium tuberculosis]]
[[Category: Bacher A]]
[[Category: Cushman M]]
[[Category: Fischer M]]
[[Category: Haase I]]
[[Category: Illarionov B]]
[[Category: Ladenstein R]]
[[Category: Meining W]]
[[Category: Morgunova E]]