View source for 2ioa


==E. coli Bifunctional glutathionylspermidine synthetase/amidase Incomplex with Mg2+ and ADP and phosphinate inhibitor==
<StructureSection load='2ioa' size='340' side='right'caption='[[2ioa]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2ioa]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IOA OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=2IOA FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=GGA:D-GAMMA-GLUTAMYL-N-{[(R)-{4-[(4-AMINOBUTYL)AMINO]BUTYL}(PHOSPHONOOXY)PHOSPHORYL]METHYL}-D-ALANINAMIDE'>GGA</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2io7|2io7]], [[2io8|2io8]], [[2io9|2io9]], [[2iob|2iob]]</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=2ioa FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ioa OCA], [http://pdbe.org/2ioa PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ioa RCSB], [http://www.ebi.ac.uk/pdbsum/2ioa PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2ioa ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/GSP_ECOLI GSP_ECOLI]] Catalyzes the formation of an amide bond between glutathione and spermidine coupled with hydrolysis of ATP; also catalyzes the hydrolysis of glutathionylspermidine to glutathione and spermidine. 
== 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/io/2ioa_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=2ioa ConSurf].
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== Publication Abstract from PubMed ==
Most organisms use glutathione to regulate intracellular thiol redox balance and protect against oxidative stress; protozoa, however, utilize trypanothione for this purpose. Trypanothione biosynthesis requires ATP-dependent conjugation of glutathione (GSH) to the two terminal amino groups of spermidine by glutathionylspermidine synthetase (GspS) and trypanothione synthetase (TryS), which are considered as drug targets. GspS catalyzes the penultimate step of the biosynthesis-amide bond formation between spermidine and the glycine carboxylate of GSH. We report herein five crystal structures of Escherichia coli GspS in complex with substrate, product or inhibitor. The C-terminal of GspS belongs to the ATP-grasp superfamily with a similar fold to the human glutathione synthetase. GSH is likely phosphorylated at one of two GSH-binding sites to form an acylphosphate intermediate that then translocates to the other site for subsequent nucleophilic addition of spermidine. We also identify essential amino acids involved in the catalysis. Our results constitute the first structural information on the biochemical features of parasite homologs (including TryS) that underlie their broad specificity for polyamines.

Dual binding sites for translocation catalysis by Escherichia coli glutathionylspermidine synthetase.,Pai CH, Chiang BY, Ko TP, Chou CC, Chong CM, Yen FJ, Chen S, Coward JK, Wang AH, Lin CH EMBO J. 2006 Dec 13;25(24):5970-82. Epub 2006 Nov 23. PMID:17124497<ref>PMID:17124497</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 2ioa" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacillus coli migula 1895]]
[[Category: Large Structures]]
[[Category: Chiang, B Y]]
[[Category: Chong, C M]]
[[Category: Chou, C C]]
[[Category: Coward, J K]]
[[Category: Ko, T P]]
[[Category: Lin, C H]]
[[Category: Pai, C H]]
[[Category: Wang, A H.J]]
[[Category: Yen, F J]]
[[Category: Bifunctional glutathionylspermidine synthetase/amidase]]
[[Category: Hydrolase]]
[[Category: Ligase]]