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New page: left|200px<br /><applet load="2hji" size="350" color="white" frame="true" align="right" spinBox="true" caption="2hji" /> '''Structural model for the Fe-containing isofo...
 
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[[Image:2hji.gif|left|200px]]<br /><applet load="2hji" size="350" color="white" frame="true" align="right" spinBox="true"
caption="2hji" />
'''Structural model for the Fe-containing isoform of acireductone dioxygenase'''<br />


==Overview==
==Structural model for the Fe-containing isoform of acireductone dioxygenase==
Acireductone dioxygenase (ARD) catalyzes different reactions between O2, and 1,2-dihydroxy-3-oxo-5-(methylthio)pent-1-ene (acireductone) depending, upon the metal bound in the active site. Ni2+ -ARD cleaves acireductone to, formate, CO and methylthiopropionate. If Fe2+ is bound (ARD'), the same, substrates yield methylthioketobutyrate and formate. The two forms differ, in structure, and are chromatographically separable. Paramagnetism of Fe2+, renders the active site of ARD' inaccessible to standard NMR methods. The, structure of ARD' has been determined using Fe2+ binding parameters, determined by X-ray absorption spectroscopy and NMR restraints from H98S, ARD, a metal-free diamagnetic protein that is isostructural with ARD'., ARD' retains the beta-sandwich fold of ARD, but a structural entropy, switch increases order at one end of a two-helix system that bisects the, beta-sandwich and decreases order at the other upon interconversion of ARD, and ARD', causing loss of the C-terminal helix in ARD' and rearrangements, of residues involved in substrate orientation in the active site.
<StructureSection load='2hji' size='340' side='right'caption='[[2hji]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2hji]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Klebsiella_oxytoca Klebsiella oxytoca]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HJI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2HJI FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FE2:FE+(II)+ION'>FE2</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=2hji FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2hji OCA], [https://pdbe.org/2hji PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2hji RCSB], [https://www.ebi.ac.uk/pdbsum/2hji PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2hji ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MTND_KLEOX MTND_KLEOX] Catalyzes 2 different reactions between oxygene and the acireductone 1,2-dihydroxy-3-keto-5-methylthiopentene (DHK-MTPene) depending upon the metal bound in the active site. Fe-containing acireductone dioxygenase (Fe-ARD) produces formate and 2-keto-4-methylthiobutyrate (KMTB), the alpha-ketoacid precursor of methionine in the methionine recycle pathway. Ni-containing acireductone dioxygenase (Ni-ARD) produces methylthiopropionate, carbon monoxide and formate, and does not lie on the methionine recycle pathway.<ref>PMID:8407993</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/hj/2hji_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=2hji ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Acireductone dioxygenase (ARD) catalyzes different reactions between O2 and 1,2-dihydroxy-3-oxo-5-(methylthio)pent-1-ene (acireductone) depending upon the metal bound in the active site. Ni2+ -ARD cleaves acireductone to formate, CO and methylthiopropionate. If Fe2+ is bound (ARD'), the same substrates yield methylthioketobutyrate and formate. The two forms differ in structure, and are chromatographically separable. Paramagnetism of Fe2+ renders the active site of ARD' inaccessible to standard NMR methods. The structure of ARD' has been determined using Fe2+ binding parameters determined by X-ray absorption spectroscopy and NMR restraints from H98S ARD, a metal-free diamagnetic protein that is isostructural with ARD'. ARD' retains the beta-sandwich fold of ARD, but a structural entropy switch increases order at one end of a two-helix system that bisects the beta-sandwich and decreases order at the other upon interconversion of ARD and ARD', causing loss of the C-terminal helix in ARD' and rearrangements of residues involved in substrate orientation in the active site.


==About this Structure==
One protein, two enzymes revisited: a structural entropy switch interconverts the two isoforms of acireductone dioxygenase.,Ju T, Goldsmith RB, Chai SC, Maroney MJ, Pochapsky SS, Pochapsky TC J Mol Biol. 2006 Nov 3;363(4):823-34. Epub 2006 Aug 26. PMID:16989860<ref>PMID:16989860</ref>
2HJI is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Klebsiella_oxytoca Klebsiella oxytoca] with <scene name='pdbligand=FE2:'>FE2</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Acireductone_dioxygenase_(Fe(2+)-requiring) Acireductone dioxygenase (Fe(2+)-requiring)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.13.11.54 1.13.11.54] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2HJI OCA].


==Reference==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
One protein, two enzymes revisited: a structural entropy switch interconverts the two isoforms of acireductone dioxygenase., Ju T, Goldsmith RB, Chai SC, Maroney MJ, Pochapsky SS, Pochapsky TC, J Mol Biol. 2006 Nov 3;363(4):823-34. Epub 2006 Aug 26. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16989860 16989860]
</div>
[[Category: Acireductone dioxygenase (Fe(2+)-requiring)]]
<div class="pdbe-citations 2hji" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Klebsiella oxytoca]]
[[Category: Klebsiella oxytoca]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Chai, S.C.]]
[[Category: Chai SC]]
[[Category: Ju, T.]]
[[Category: Ju T]]
[[Category: Maroney, M.J.]]
[[Category: Maroney MJ]]
[[Category: Pochapsky, T.C.]]
[[Category: Pochapsky TC]]
[[Category: FE2]]
[[Category: dioxygenase]]
[[Category: isozyme]]
[[Category: methionine salvage]]
[[Category: non-heme iron]]
[[Category: structural entropy]]
 
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