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1g8m

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[[Image:1g8m.jpg|left|200px]]<br /><applet load="1g8m" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1g8m, resolution 1.75&Aring;" />
 
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'''CRYSTAL STRUCTURE OF AVIAN ATIC, A BIFUNCTIONAL TRANSFORMYLASE AND CYCLOHYDROLASE ENZYME IN PURINE BIOSYNTHESIS AT 1.75 ANG. RESOLUTION'''<br />
 
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==Overview==
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==CRYSTAL STRUCTURE OF AVIAN ATIC, A BIFUNCTIONAL TRANSFORMYLASE AND CYCLOHYDROLASE ENZYME IN PURINE BIOSYNTHESIS AT 1.75 ANG. RESOLUTION==
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ATIC, the product of the purH gene, is a 64 kDa bifunctional enzyme that possesses the final two activities in de novo purine biosynthesis, AICAR transformylase and IMP cyclohydrolase. The crystal structure of avian ATIC has been determined to 1.75 A resolution by the MAD method using a Se-methionine modified enzyme. ATIC forms an intertwined dimer with an extensive interface of approximately 5,000 A(2) per monomer. Each monomer is composed of two novel, separate functional domains. The N-terminal domain (up to residue 199) is responsible for the IMPCH activity, whereas the AICAR Tfase activity resides in the C-terminal domain (200-593). The active sites of the IMPCH and AICAR Tfase domains are approximately 50 A apart, with no structural evidence of a tunnel connecting the two active sites. The crystal structure of ATIC provides a framework to probe both catalytic mechanisms and to design specific inhibitors for use in cancer chemotherapy and inflammation.
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<StructureSection load='1g8m' size='340' side='right'caption='[[1g8m]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[1g8m]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G8M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1G8M FirstGlance]. <br>
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1G8M is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus] with <scene name='pdbligand=K:'>K</scene> and <scene name='pdbligand=G:'>G</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G8M OCA].
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.75&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
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==Reference==
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1g8m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g8m OCA], [https://pdbe.org/1g8m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1g8m RCSB], [https://www.ebi.ac.uk/pdbsum/1g8m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1g8m ProSAT]</span></td></tr>
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Crystal structure of a bifunctional transformylase and cyclohydrolase enzyme in purine biosynthesis., Greasley SE, Horton P, Ramcharan J, Beardsley GP, Benkovic SJ, Wilson IA, Nat Struct Biol. 2001 May;8(5):402-6. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11323713 11323713]
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/PUR9_CHICK PUR9_CHICK] Bifunctional enzyme that catalyzes 2 steps in purine biosynthesis.<ref>PMID:12501179</ref>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/g8/1g8m_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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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=1g8m ConSurf].
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<div style="clear:both"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Gallus gallus]]
[[Category: Gallus gallus]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Beardsley, G P.]]
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[[Category: Beardsley GP]]
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[[Category: Benkovic, S J.]]
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[[Category: Benkovic SJ]]
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[[Category: Greasley, S E.]]
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[[Category: Greasley SE]]
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[[Category: Horton, P.]]
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[[Category: Horton P]]
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[[Category: Wilson, I A.]]
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[[Category: Wilson IA]]
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[[Category: G]]
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[[Category: K]]
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[[Category: 1 alpha + beta domain]]
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[[Category: 2 functional domains; impch domain = alpha/beta/alpha; aicar tfase = 2 alpha/beta/alpha domains]]
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[[Category: homodimer]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:47:31 2008''
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Current revision

CRYSTAL STRUCTURE OF AVIAN ATIC, A BIFUNCTIONAL TRANSFORMYLASE AND CYCLOHYDROLASE ENZYME IN PURINE BIOSYNTHESIS AT 1.75 ANG. RESOLUTION

PDB ID 1g8m

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