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<StructureSection load='1jvn' size='340' side='right'caption='[[1jvn]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
<StructureSection load='1jvn' size='340' side='right'caption='[[1jvn]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1jvn]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_18824 Atcc 18824]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JVN OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1JVN FirstGlance]. <br>
<table><tr><td colspan='2'>[[1jvn]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JVN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1JVN FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene>, <scene name='pdbligand=POP:PYROPHOSPHATE+2-'>POP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1&#8491;</td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=143:S-2,3-DIHYDRO-5-GLYCIN-2-YL-ISOXAZOL-3-YL-CYSTEINE'>143</scene></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=143:S-2,3-DIHYDRO-5-GLYCIN-2-YL-ISOXAZOL-3-YL-CYSTEINE'>143</scene>, <scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene>, <scene name='pdbligand=POP:PYROPHOSPHATE+2-'>POP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">HIS7 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 ATCC 18824])</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=1jvn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jvn OCA], [https://pdbe.org/1jvn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1jvn RCSB], [https://www.ebi.ac.uk/pdbsum/1jvn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1jvn ProSAT]</span></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=1jvn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jvn OCA], [http://pdbe.org/1jvn PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1jvn RCSB], [http://www.ebi.ac.uk/pdbsum/1jvn PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1jvn ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/HIS5_YEAST HIS5_YEAST]] IGPS catalyzes the conversion of PRFAR and glutamine to IGP, AICAR and glutamate. The glutamine amidotransferase domain provides the ammonia necessary to the cyclase domain to produce IGP and AICAR from PRFAR.  
[https://www.uniprot.org/uniprot/HIS5_YEAST HIS5_YEAST] IGPS catalyzes the conversion of PRFAR and glutamine to IGP, AICAR and glutamate. The glutamine amidotransferase domain provides the ammonia necessary to the cyclase domain to produce IGP and AICAR from PRFAR.
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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</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=1jvn ConSurf].
</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=1jvn ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
BACKGROUND: Imidazole glycerol phosphate synthase catalyzes a two-step reaction of histidine biosynthesis at the bifurcation point with the purine de novo pathway. The enzyme is a new example of intermediate channeling by glutamine amidotransferases in which ammonia generated by hydrolysis of glutamine is channeled to a second active site where it acts as a nucleophile. In this case, ammonia reacts in a cyclase domain to produce imidazole glycerol phosphate and an intermediate of purine biosynthesis. The enzyme is also a potential target for drug and herbicide development since the histidine pathway does not occur in mammals. RESULTS: The 2.1 A crystal structure of imidazole glycerol phosphate synthase from yeast reveals extensive interaction of the glutaminase and cyclase catalytic domains. At the domain interface, the glutaminase active site points into the bottom of the (beta/alpha)(8) barrel of the cyclase domain. An ammonia tunnel through the (beta/alpha)(8) barrel connects the glutaminase docking site at the bottom to the cyclase active site at the top. A conserved "gate" of four charged residues controls access to the tunnel. CONCLUSIONS: This is the first structure in which all the components of the ubiquitous (beta/alpha)(8) barrel fold, top, bottom, and interior, take part in enzymatic function. Intimate contacts between the barrel domain and the glutaminase active site appear to be poised for crosstalk between catalytic centers in response to substrate binding at the cyclase active site. The structure provides a number of potential sites for inhibitor development in the active sites and in a conserved interdomain cavity.
Crystal structure of imidazole glycerol phosphate synthase: a tunnel through a (beta/alpha)8 barrel joins two active sites.,Chaudhuri BN, Lange SC, Myers RS, Chittur SV, Davisson VJ, Smith JL Structure. 2001 Oct;9(10):987-97. PMID:11591353<ref>PMID:11591353</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1jvn" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Atcc 18824]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Chaudhuri, B N]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Chittur, S V]]
[[Category: Chaudhuri BN]]
[[Category: Davisson, V J]]
[[Category: Chittur SV]]
[[Category: Lange, S C]]
[[Category: Davisson VJ]]
[[Category: Myers, R S]]
[[Category: Lange SC]]
[[Category: Smith, J L]]
[[Category: Myers RS]]
[[Category: Amidotransferase]]
[[Category: Smith JL]]
[[Category: Substrate channeling]]
[[Category: Tim-barrel as a substrate tunnel]]
[[Category: Transferase]]

Revision as of 07:55, 3 April 2024

CRYSTAL STRUCTURE OF IMIDAZOLE GLYCEROL PHOSPHATE SYNTHASE: A TUNNEL THROUGH A (BETA/ALPHA)8 BARREL JOINS TWO ACTIVE SITES

1jvn, resolution 2.10Å

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