2fkz

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[[Image:2fkz.gif|left|200px]]<br /><applet load="2fkz" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="2fkz, resolution 2.00&Aring;" />
 
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'''Reduced (All Ferrous) form of the Azotobacter vinelandii bacterioferritin'''<br />
 
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==Overview==
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==Reduced (All Ferrous) form of the Azotobacter vinelandii bacterioferritin==
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In this work, we report the X-ray crystal structure of the aerobically isolated (oxidized) and the anaerobic dithionite-reduced (at pH 8.0) forms of the native Azotobacter vinelandii bacterioferritin to 2.7 and 2.0 A resolution, respectively. Iron K-edge multiple anomalous dispersion (MAD) experiments unequivocally identified the presence of three independent iron-containing sites within the protein structure. Specifically, a dinuclear (ferroxidase) site, a b-type heme site, and the binding of a single iron atom at the four-fold molecular axis of the protein shell were observed. In addition to the novel observation of iron at the four-fold pore, these data also reveal that the oxidized form of the protein has a symmetrical ferroxidase site containing two five-coordinate iron atoms. Each iron atom is ligated by four carboxylate oxygen atoms and a single histidyl nitrogen atom. A single water molecule is found within hydrogen bonding distance of the ferroxidase site that bridges the two iron atoms on the side opposite the histidine ligands. Chemical reduction of the protein under anaerobic conditions results in an increase in the average Fe-Fe distance in the ferroxidase site from approximately 3.5 to approximately 4.0 A and the loss of one of the ligands, H130. In addition, there is significant movement of the bridging water molecule and several other amino acid side chains in the vicinity of the ferroxidase site and along the D helix to the three-fold symmetry axis. In contrast to previous work, the higher-resolution data for the dithionite-reduced structure suggest that the heme may be bound in multiple conformations. Taken together, these data allow a molecular movie of the ferroxidase gating mechanism to be developed and provide further insight into the iron uptake and/or release and mineralization mechanism of bacterioferritins in general.
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<StructureSection load='2fkz' size='340' side='right'caption='[[2fkz]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[2fkz]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Azotobacter_vinelandii Azotobacter vinelandii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FKZ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2FKZ 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=FE2:FE+(II)+ION'>FE2</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=2fkz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fkz OCA], [https://pdbe.org/2fkz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2fkz RCSB], [https://www.ebi.ac.uk/pdbsum/2fkz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2fkz ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/BFR_AZOVI BFR_AZOVI] Iron-storage protein, whose ferroxidase center binds Fe(2+) ions, oxidizes them by dioxygen to Fe(3+), and participates in the subsequent Fe(3+) oxide mineral core formation within the central cavity of the protein complex (By similarity).
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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/fk/2fkz_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=2fkz 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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2FKZ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Azotobacter_vinelandii Azotobacter vinelandii] with <scene name='pdbligand=FE2:'>FE2</scene>, <scene name='pdbligand=MG:'>MG</scene> and <scene name='pdbligand=HEM:'>HEM</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FKZ OCA].
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*[[Ferritin 3D structures|Ferritin 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Redox-dependent structural changes in the Azotobacter vinelandii bacterioferritin: new insights into the ferroxidase and iron transport mechanism., Swartz L, Kuchinskas M, Li H, Poulos TL, Lanzilotta WN, Biochemistry. 2006 Apr 11;45(14):4421-8. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16584178 16584178]
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[[Category: Azotobacter vinelandii]]
[[Category: Azotobacter vinelandii]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Kunchinskas, M.]]
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[[Category: Kunchinskas M]]
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[[Category: Lanzilotta, W N.]]
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[[Category: Lanzilotta WN]]
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[[Category: Li, H.]]
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[[Category: Li H]]
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[[Category: Poulos, T L.]]
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[[Category: Poulos TL]]
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[[Category: Swartz, L.]]
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[[Category: Swartz L]]
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[[Category: FE2]]
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[[Category: HEM]]
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[[Category: MG]]
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[[Category: bacterioferritin]]
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[[Category: diiron site]]
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[[Category: ferritin]]
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[[Category: ferroxidase]]
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[[Category: iron transport]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:22:25 2008''
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Current revision

Reduced (All Ferrous) form of the Azotobacter vinelandii bacterioferritin

PDB ID 2fkz

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