View source for 4fx2


==COMPARISON OF THE CRYSTAL STRUCTURES OF A FLAVODOXIN IN ITS THREE OXIDATION STATES AT CRYOGENIC TEMPERATURES==
<StructureSection load='4fx2' size='340' side='right'caption='[[4fx2]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4fx2]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_29579 Atcc 29579]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4FX2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4FX2 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FMN:FLAVIN+MONONUCLEOTIDE'>FMN</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4fx2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4fx2 OCA], [http://pdbe.org/4fx2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4fx2 RCSB], [http://www.ebi.ac.uk/pdbsum/4fx2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4fx2 ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/FLAV_DESVH FLAV_DESVH]] Low-potential electron donor to a number of redox enzymes. 
== 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/fx/4fx2_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=4fx2 ConSurf].
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== Publication Abstract from PubMed ==
The focus of this study has been to determine the conformation of the holoprotein of recombinant flavodoxin from Desulfovibrio vulgaris with the FMN in each of its three oxidation states. The structures of the oxidized state of the wild-type flavodoxin at 2.0 A from D. vulgaris was used as a starting model for refinement. Diffraction experiments were conducted at low temperature (-150 degrees C) in order to maintain the oxidation state of interest throughout the intensity data collection. yellow bipyramids by the standard hanging-drop method from 3.2 M-ammonium sulfate in 0.1 M-Tris-HCl buffer at pH 7.0 with protein concentrations ranging from 0.7% to 0.9%. The reduced states of the crystals were achieved through the addition of sodium dithionite at pH 7.0 for the semiquinone (semi-reduced) and at pH 9.0 for the hydroquinone (fully reduced). Data sets consisting of one at room temperature (oxidized state) and three at low temperature (each oxidation state) were collected on a Nicolet P3F/Xentronics area detector X-ray diffractometer system. The four structures, hydroquinone at 2.25 A resolution and all others at 1.9 A resolution, were refined by the restrained parameter least-squares program PROLSQ. The final crystallographic R-values converged to 0.21 (hydroquinone), 0.20 (semiquinone), 0.20 (oxidized, low temperature), and 0.17 (oxidized, room temperature). The reduced states of flavodoxin show a different conformation of the protein polypeptide chain (Asp61-Gly62) in the vicinity of NH(5) of the isoalloxazine group relative to the oxidized state. However, there are only slight conformational differences between the semiquinone and hydroquinone states. In this report, structural comparisons of the three are made, with particular emphasis on the features that might be related to the difference in temperature of the diffraction data collections and differences in the oxidation state of the FMN.

Comparison of the crystal structures of a flavodoxin in its three oxidation states at cryogenic temperatures.,Watt W, Tulinsky A, Swenson RP, Watenpaugh KD J Mol Biol. 1991 Mar 5;218(1):195-208. PMID:2002503<ref>PMID:2002503</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 4fx2" style="background-color:#fffaf0;"></div>

==See Also==
*[[Flavodoxin 3D structures|Flavodoxin 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Atcc 29579]]
[[Category: Large Structures]]
[[Category: Watenpaugh, K D]]
[[Category: Watt, W]]
[[Category: Electron transport]]