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1eo9

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[[Image:1eo9.gif|left|200px]]<br /><applet load="1eo9" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1eo9, resolution 2.0&Aring;" />
 
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'''CRYSTAL STRUCTURE OF ACINETOBACTER SP. ADP1 PROTOCATECHUATE 3,4-DIOXYGENASE AT PH < 7.0'''<br />
 
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==Overview==
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==CRYSTAL STRUCTURE OF ACINETOBACTER SP. ADP1 PROTOCATECHUATE 3,4-DIOXYGENASE AT PH < 7.0==
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The crystal structures of protocatechuate 3,4-dioxygenase from the soil bacteria Acinetobacterstrain ADP1 (Ac 3,4-PCD) have been determined in space group I23 at pH 8.5 and 5.75. In addition, the structures of Ac 3,4-PCD complexed with its substrate 3, 4-dihydroxybenzoic acid (PCA), the inhibitor 4-nitrocatechol (4-NC), or cyanide (CN(-)) have been solved using native phases. The overall tertiary and quaternary structures of Ac 3,4-PCD are similar to those of the same enzyme from Pseudomonas putida[Ohlendorf et al. (1994) J. Mol. Biol. 244, 586-608]. At pH 8.5, the catalytic non-heme Fe(3+) is coordinated by two axial ligands, Tyr447(OH) (147beta) and His460(N)(epsilon)(2) (160beta), and three equatorial ligands, Tyr408(OH) (108beta), His462(N)(epsilon)(2) (162beta), and a hydroxide ion (d(Fe-OH) = 1.91 A) in a distorted bipyramidal geometry. At pH 5.75, difference maps suggest a sulfate binds to the Fe(3+) in an equatorial position and the hydroxide is shifted [d(Fe-OH) = 2.3 A] yielding octahedral geometry for the active site Fe(3+). This change in ligation geometry is concomitant with a shift in the optical absorbance spectrum of the enzyme from lambda(max) = 450 nm to lambda(max) = 520 nm. Binding of substrate or 4-NC to the Fe(3+) is bidentate with the axial ligand Tyr447(OH) (147beta) dissociating. The structure of the 4-NC complex supports the view that resonance delocalization of the positive character of the nitrogen prevents substrate activation. The cyanide complex confirms previous work that protocatechuate 3,4-dioxygenases have three coordination sites available for binding by exogenous substrates. A significant conformational change extending away from the active site is seen in all structures when compared to the native enzyme at pH 8.5. This conformational change is discussed in its relevance to enhancing catalysis in protocatechuate 3,4-dioxygenases.
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<StructureSection load='1eo9' size='340' side='right'caption='[[1eo9]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1eo9]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Acinetobacter_baylyi_ADP1 Acinetobacter baylyi ADP1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EO9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EO9 FirstGlance]. <br>
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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]] 2&#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=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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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=1eo9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eo9 OCA], [https://pdbe.org/1eo9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1eo9 RCSB], [https://www.ebi.ac.uk/pdbsum/1eo9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1eo9 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/PCXA_ACIAD PCXA_ACIAD] Plays an essential role in the utilization of numerous aromatic and hydroaromatic compounds via the beta-ketoadipate pathway.
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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/eo/1eo9_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=1eo9 ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1EO9 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Acinetobacter_sp. Acinetobacter sp.] with <scene name='pdbligand=FE:'>FE</scene> and <scene name='pdbligand=SO4:'>SO4</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Protocatechuate_3,4-dioxygenase Protocatechuate 3,4-dioxygenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.13.11.3 1.13.11.3] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EO9 OCA].
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*[[Dioxygenase 3D structures|Dioxygenase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Structure of Acinetobacter strain ADP1 protocatechuate 3, 4-dioxygenase at 2.2 A resolution: implications for the mechanism of an intradiol dioxygenase., Vetting MW, D'Argenio DA, Ornston LN, Ohlendorf DH, Biochemistry. 2000 Jul 11;39(27):7943-55. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10891075 10891075]
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[[Category: Acinetobacter baylyi ADP1]]
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[[Category: Acinetobacter sp.]]
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[[Category: Large Structures]]
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[[Category: Protein complex]]
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[[Category: D'Argenio DA]]
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[[Category: Protocatechuate 3,4-dioxygenase]]
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[[Category: Ohlendorf DH]]
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[[Category: Argenio, D A.D.]]
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[[Category: Ornston LN]]
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[[Category: Ohlendorf, D H.]]
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[[Category: Vetting MW]]
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[[Category: Ornston, L N.]]
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[[Category: Vetting, M W.]]
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[[Category: FE]]
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[[Category: SO4]]
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[[Category: beta-sandwich]]
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[[Category: biodegradation]]
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[[Category: dioxygenase]]
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[[Category: mixed alpha/beta structure]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:29:50 2008''
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Current revision

CRYSTAL STRUCTURE OF ACINETOBACTER SP. ADP1 PROTOCATECHUATE 3,4-DIOXYGENASE AT PH < 7.0

PDB ID 1eo9

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