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[[Image:1gin.jpg|left|200px]]


{{Structure
==CRYSTAL STRUCTURE OF ADENYLOSUCCINATE SYNTHETASE FROM ESCHERICHIA COLI COMPLEXED WITH GDP, IMP, HADACIDIN, NO3-, AND MG2+. DATA COLLECTED AT 298K (PH 6.5).==
|PDB= 1gin |SIZE=350|CAPTION= <scene name='initialview01'>1gin</scene>, resolution 2.8&Aring;
<StructureSection load='1gin' size='340' side='right'caption='[[1gin]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
|SITE= <scene name='pdbsite=ASP:These+Residues+Make+Up+The+Guanine+Nucleotide+Binding+Si+...'>ASP</scene>, <scene name='pdbsite=GNS:These+Residues+Make+Up+The+Guanine+Nucleotide+Binding+Si+...'>GNS</scene> and <scene name='pdbsite=IMP:These+Residues+Make+Up+The+Guanine+Nucleotide+Binding+Si+...'>IMP</scene>
== Structural highlights ==
|LIGAND= <scene name='pdbligand=GDP:GUANOSINE-5&#39;-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=HAD:(CARBOXYHYDROXYAMINO)ETHANOIC+ACID'>HAD</scene>, <scene name='pdbligand=IMP:INOSINIC+ACID'>IMP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NO3:NITRATE+ION'>NO3</scene>
<table><tr><td colspan='2'>[[1gin]] 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=1GIN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1GIN FirstGlance]. <br>
|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Adenylosuccinate_synthase Adenylosuccinate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.3.4.4 6.3.4.4] </span>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8&#8491;</td></tr>
|GENE=
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=HDA:HADACIDIN'>HDA</scene>, <scene name='pdbligand=IMP:INOSINIC+ACID'>IMP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NO3:NITRATE+ION'>NO3</scene></td></tr>
|DOMAIN=
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1gin FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1gin OCA], [https://pdbe.org/1gin PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1gin RCSB], [https://www.ebi.ac.uk/pdbsum/1gin PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1gin ProSAT]</span></td></tr>
|RELATEDENTRY=
</table>
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1gin FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1gin OCA], [http://www.ebi.ac.uk/pdbsum/1gin PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1gin RCSB]</span>
== Function ==
}}
[https://www.uniprot.org/uniprot/PURA_ECOLI PURA_ECOLI] Plays an important role in the de novo pathway of purine nucleotide biosynthesis. Catalyzes the first committed step in the biosynthesis of AMP from IMP (By similarity).[HAMAP-Rule:MF_00011]
== 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/gi/1gin_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=1gin ConSurf].
<div style="clear:both"></div>


'''CRYSTAL STRUCTURE OF ADENYLOSUCCINATE SYNTHETASE FROM ESCHERICHIA COLI COMPLEXED WITH GDP, IMP, HADACIDIN, NO3-, AND MG2+. DATA COLLECTED AT 298K (PH 6.5).'''
==See Also==
 
*[[Adenylosuccinate synthetase 3D structures|Adenylosuccinate synthetase 3D structures]]
 
__TOC__
==Overview==
</StructureSection>
Crystal structures of adenylosuccinate synthetase from Esherichia coli complexed with Mg2+, IMP, GDP, NO3- and hadacidin at 298 and 100 K have been refined to R-factors of 0.188 and 0.206 against data to 2.8 A and 2.5 A resolution, respectively. Conformational changes of up to 9 A relative to the unligated enzyme occur in loops that bind to Mg2+, GDP, IMP and hadacidin. Mg2+ binds directly to GDP, NO3-, hadacidin and the protein, but is only five-coordinated. Asp13, which approaches, but does not occupy the sixth coordination site of Mg2+, hydrogen bonds to N1 of IMP. The nitrogen atom of NO3- is approximately 2.7 A from O6 of IMP, reflecting a strong electrostatic interaction between the electron-deficient nitrogen atom and the electron-rich O6. The spatial relationships between GDP, NO3- and Mg2+ suggest an interaction between the beta,gamma-bridging oxygen atom of GTP and Mg2+ in the enzyme-substrate complex. His41 hydrogen bonds to the beta-phosphate group of GDP and approaches bound NO3-. The aldehyde group of hadacidin coordinates to the Mg2+, while its carboxyl group interacts with backbone amide groups 299 to 303 and the side-chain of Arg303. The 5'-phosphate group of IMP interacts with Asn38, Thr129, Thr239 and Arg143 (from a monomer related by 2-fold symmetry). A mechanism is proposed for the two-step reaction governed by the synthetase, in which His41 and Asp13 are essential catalytic side-chains.
 
==About this Structure==
1GIN 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=1GIN OCA].
 
==Reference==
Crystal structures of adenylosuccinate synthetase from Escherichia coli complexed with GDP, IMP hadacidin, NO3-, and Mg2+., Poland BW, Fromm HJ, Honzatko RB, J Mol Biol. 1996 Dec 20;264(5):1013-27. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9000627 9000627]
[[Category: Adenylosuccinate synthase]]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Fromm, H J.]]
[[Category: Fromm HJ]]
[[Category: Honzatko, R B.]]
[[Category: Honzatko RB]]
[[Category: Poland, B W.]]
[[Category: Poland BW]]
[[Category: gtp-hydrolyzing enzyme]]
[[Category: ligase]]
[[Category: purine nucleotide biosynthesis]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:44:53 2008''
Retrieved from "https://proteopedia.org/1gin"