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1sur

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[[Image:1sur.jpg|left|200px]]
 
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{{Structure
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==PHOSPHO-ADENYLYL-SULFATE REDUCTASE==
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|PDB= 1sur |SIZE=350|CAPTION= <scene name='initialview01'>1sur</scene>, resolution 2.0&Aring;
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<StructureSection load='1sur' size='340' side='right'caption='[[1sur]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND=
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<table><tr><td colspan='2'>[[1sur]] 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=1SUR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SUR FirstGlance]. <br>
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|ACTIVITY= [http://en.wikipedia.org/wiki/Phosphoadenylyl-sulfate_reductase_(thioredoxin) Phosphoadenylyl-sulfate reductase (thioredoxin)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.8.4.8 1.8.4.8]
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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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|GENE= CYSH ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
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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=1sur FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sur OCA], [https://pdbe.org/1sur PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1sur RCSB], [https://www.ebi.ac.uk/pdbsum/1sur PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1sur ProSAT]</span></td></tr>
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}}
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</table>
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== Function ==
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'''PHOSPHO-ADENYLYL-SULFATE REDUCTASE'''
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[https://www.uniprot.org/uniprot/CYSH_ECOLI CYSH_ECOLI] Reduction of activated sulfate into sulfite.[HAMAP-Rule:MF_00063]
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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==Overview==
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Check<jmol>
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BACKGROUND: Assimilatory sulphate reduction supplies prototrophic organisms with reduced sulphur for the biosynthesis of all sulphur-containing metabolites. This process is driven by a sequence of enzymatic steps involving phosphoadenylyl sulphate (PAPS) reductase. Thioredoxin is used as the electron donor for the reduction of PAPS to phospho-adenosine-phosphate (PAP) and sulphite. Unlike most electron-transfer reactions, there are no cofactors or prosthetic groups involved in this reduction and PAPS reductase is one of the rare examples of an enzyme that is able to store two electrons. Determination of the structure of PAPS reductase is the first step towards elucidating the biochemical details of the reduction of PAPS to sulphite. RESULTS: We have determined the crystal structure of PAPS reductase at 2.0 A resolution in the open, reduced form, in which a flexible loop covers the active site. The protein is active as a dimer, each monomer consisting of a central six-stranded beta sheet with alpha helices packing against each side. A highly modified version of the P loop, the fingerprint peptide of mononucleotide-binding proteins, is present in the active site of the protein, which appears to be a positively charged cleft containing a number of conserved arginine and lysine residues. Although PAPS reductase has no ATPase activity, it shows a striking similarity to the structure of the ATP pyrophosphatase (ATP PPase) domain of GMP synthetase, indicating that both enzyme families have evolved from a common ancestral nucleotide-binding fold. CONCLUSIONS: The sequence conservation between ATP sulphurylases, a subfamily of ATP PPases, and PAPS reductase and the similarities in both their mechanisms and folds, suggest an evolutionary link between the ATP PPases and PAPS reductases. Together with the N type ATP PPases, PAPS reductases and ATP sulphurylases are proposed to form a new family of homologous enzymes with adenine nucleotide alpha-hydrolase activity. The open, reduced form of PAPS reductase is able to bind PAPS, whereas the closed oxidized form cannot. A movement between the two monomers of the dimer may allow this switch in conformation to occur.
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/su/1sur_consurf.spt"</scriptWhenChecked>
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==About this Structure==
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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1SUR is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SUR OCA].
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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==Reference==
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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=1sur ConSurf].
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Crystal structure of phosphoadenylyl sulphate (PAPS) reductase: a new family of adenine nucleotide alpha hydrolases., Savage H, Montoya G, Svensson C, Schwenn JD, Sinning I, Structure. 1997 Jul 15;5(7):895-906. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9261082 9261082]
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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: Phosphoadenylyl-sulfate reductase (thioredoxin)]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Savage H]]
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[[Category: Savage, H.]]
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[[Category: Sinning I]]
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[[Category: Sinning, I.]]
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[[Category: 3-phospho-adenylyl-sulfate reductase]]
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[[Category: assimilatory sulfate reduction]]
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[[Category: oxidoreductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 14:09:54 2008''
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Current revision

PHOSPHO-ADENYLYL-SULFATE REDUCTASE

PDB ID 1sur

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