1ddi

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[[Image:1ddi.gif|left|200px]]<br /><applet load="1ddi" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1ddi, resolution 2.51&Aring;" />
 
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'''CRYSTAL STRUCTURE OF SIR-FP60'''<br />
 
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==Overview==
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==CRYSTAL STRUCTURE OF SIR-FP60==
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Escherichia coli NADPH-sulfite reductase (SiR) is a 780 kDa multimeric hemoflavoprotein composed of eight alpha-subunits (SiR-FP) and four beta-subunits (SiR-HP) that catalyses the six electron reduction of sulfite to sulfide. Each beta-subunit contains a Fe4S4 cluster and a siroheme, and each alpha-subunit binds one FAD and one FMN as prosthetic groups. The FAD gets electrons from NADPH, and the FMN transfers the electrons to the metal centers of the beta-subunit for sulfite reduction. We report here the 1.94 A X-ray structure of SiR-FP60, a recombinant monomeric fragment of SiR-FP that binds both FAD and FMN and retains the catalytic properties of the native protein. The structure can be divided into three domains. The carboxy-terminal part of the enzyme is composed of an antiparallel beta-barrel which binds the FAD, and a variant of the classical pyridine dinucleotide binding fold which binds NADPH. These two domains form the canonic FNR-like module, typical of the ferredoxin NADP+ reductase family. By analogy with the structure of the cytochrome P450 reductase, the third domain, composed of seven alpha-helices, is supposed to connect the FNR-like module to the N-terminal flavodoxine-like module. In four different crystal forms, the FMN-binding module is absent from electron density maps, although mass spectroscopy, amino acid sequencing and activity experiments carried out on dissolved crystals indicate that a functional module is present in the protein. Our results clearly indicate that the interaction between the FNR-like and the FMN-like modules displays lower affinity than in the case of cytochrome P450 reductase. The flexibility of the FMN-binding domain may be related, as observed in the case of cytochrome bc1, to a domain reorganisation in the course of electron transfer. Thus, a movement of the FMN-binding domain relative to the rest of the enzyme may be a requirement for its optimal positioning relative to both the FNR-like module and the beta-subunit.
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<StructureSection load='1ddi' size='340' side='right'caption='[[1ddi]], [[Resolution|resolution]] 2.51&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[1ddi]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DDI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1DDI FirstGlance]. <br>
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1DDI is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with <scene name='pdbligand=FAD:'>FAD</scene> and <scene name='pdbligand=NAP:'>NAP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Sulfite_reductase_(NADPH) Sulfite reductase (NADPH)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.8.1.2 1.8.1.2] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DDI 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]] 2.51&#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=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=NAP:NADP+NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NAP</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=1ddi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ddi OCA], [https://pdbe.org/1ddi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ddi RCSB], [https://www.ebi.ac.uk/pdbsum/1ddi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ddi ProSAT]</span></td></tr>
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Four crystal structures of the 60 kDa flavoprotein monomer of the sulfite reductase indicate a disordered flavodoxin-like module., Gruez A, Pignol D, Zeghouf M, Coves J, Fontecave M, Ferrer JL, Fontecilla-Camps JC, J Mol Biol. 2000 May 26;299(1):199-212. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10860732 10860732]
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/CYSJ_ECOLI CYSJ_ECOLI] Component of the sulfite reductase complex that catalyzes the 6-electron reduction of sulfite to sulfide. This is one of several activities required for the biosynthesis of L-cysteine from sulfate. The flavoprotein component catalyzes the electron flow from NADPH -> FAD -> FMN to the hemoprotein component.[HAMAP-Rule:MF_01541]
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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/dd/1ddi_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=1ddi ConSurf].
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<div style="clear:both"></div>
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__TOC__
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</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Sulfite reductase (NADPH)]]
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[[Category: Coves J]]
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[[Category: Coves, J.]]
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[[Category: Ferrer JL]]
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[[Category: Ferrer, J L.]]
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[[Category: Fontecave M]]
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[[Category: Fontecave, M.]]
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[[Category: Fontecilla-Camps JC]]
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[[Category: Fontecilla-Camps, J C.]]
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[[Category: Gruez A]]
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[[Category: Gruez, A.]]
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[[Category: Pignol D]]
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[[Category: Pignol, D.]]
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[[Category: Zeghouf M]]
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[[Category: Zeghouf, M.]]
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[[Category: FAD]]
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[[Category: NAP]]
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[[Category: cytochrome p450 reductase]]
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[[Category: flavoprotein]]
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[[Category: fnr]]
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[[Category: modular protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:15:30 2008''
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Current revision

CRYSTAL STRUCTURE OF SIR-FP60

PDB ID 1ddi

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