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[[Image:2anb.gif|left|200px]]


{{Structure
==Crystal Structure Of Oligomeric E.coli Guanylate Kinase In Complex With GMP==
|PDB= 2anb |SIZE=350|CAPTION= <scene name='initialview01'>2anb</scene>, resolution 2.90&Aring;
<StructureSection load='2anb' size='340' side='right'caption='[[2anb]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND= <scene name='pdbligand=5GP:GUANOSINE-5&#39;-MONOPHOSPHATE'>5GP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>
<table><tr><td colspan='2'>[[2anb]] 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=2ANB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2ANB FirstGlance]. <br>
|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Guanylate_kinase Guanylate kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.4.8 2.7.4.8] </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]] 2.9&#8491;</td></tr>
|GENE= gmk ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5GP:GUANOSINE-5-MONOPHOSPHATE'>5GP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=2anb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2anb OCA], [https://pdbe.org/2anb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2anb RCSB], [https://www.ebi.ac.uk/pdbsum/2anb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2anb ProSAT]</span></td></tr>
|RELATEDENTRY=[[2an9|2AN9]], [[2anc|2ANC]]
</table>
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2anb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2anb OCA], [http://www.ebi.ac.uk/pdbsum/2anb PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2anb RCSB]</span>
== Function ==
}}
[https://www.uniprot.org/uniprot/KGUA_ECOLI KGUA_ECOLI] Essential for recycling GMP and indirectly, cGMP.<ref>PMID:8390989</ref>
== 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/an/2anb_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=2anb ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Guanosine monophosphate kinases (GMPKs), which catalyze the phosphorylation of GMP and dGMP to their diphosphate form, have been characterized as monomeric enzymes in eukaryotes and prokaryotes. Here, we report that GMPK from Escherichia coli (ecGMPK) assembles in solution and in the crystal as several different oligomers. Thermodynamic analysis of ecGMPK using differential scanning calorimetry shows that the enzyme is in equilibrium between a dimer and higher order oligomers, whose relative amounts depend on protein concentration, ionic strength, and the presence of ATP. Crystallographic structures of ecGMPK in the apo, GMP and GDP-bound forms were solved at 3.2A, 2.9A and 2.4A resolution, respectively. ecGMPK forms a hexamer with D3 symmetry in all crystal forms, in which the two nucleotide-binding domains are able to undergo closure comparable to that of monomeric GMPKs. The 2-fold and 3-fold interfaces involve a 20-residue C-terminal extension and a sequence signature, respectively, that are missing from monomeric eukaryotic GMPKs, explaining why ecGMPK forms oligomers. These signatures are found in GMPKs from proteobacteria, some of which are human pathogens. GMPKs from these bacteria are thus likely to form the same quaternary structures. The shift of the thermodynamic equilibrium towards the dimer at low ecGMPK concentration together with the observation that inter-subunit interactions partially occlude the ATP-binding site in the hexameric structure suggest that the dimer may be the active species at physiological enzyme concentration.


'''Crystal Structure Of Oligomeric E.coli Guanylate Kinase In Complex With GMP'''
Calorimetric and crystallographic analysis of the oligomeric structure of Escherichia coli GMP kinase.,Hible G, Renault L, Schaeffer F, Christova P, Zoe Radulescu A, Evrin C, Gilles AM, Cherfils J J Mol Biol. 2005 Oct 7;352(5):1044-59. PMID:16140325<ref>PMID:16140325</ref>


From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2anb" style="background-color:#fffaf0;"></div>


==Overview==
==See Also==
Guanosine monophosphate kinases (GMPKs), which catalyze the phosphorylation of GMP and dGMP to their diphosphate form, have been characterized as monomeric enzymes in eukaryotes and prokaryotes. Here, we report that GMPK from Escherichia coli (ecGMPK) assembles in solution and in the crystal as several different oligomers. Thermodynamic analysis of ecGMPK using differential scanning calorimetry shows that the enzyme is in equilibrium between a dimer and higher order oligomers, whose relative amounts depend on protein concentration, ionic strength, and the presence of ATP. Crystallographic structures of ecGMPK in the apo, GMP and GDP-bound forms were solved at 3.2A, 2.9A and 2.4A resolution, respectively. ecGMPK forms a hexamer with D3 symmetry in all crystal forms, in which the two nucleotide-binding domains are able to undergo closure comparable to that of monomeric GMPKs. The 2-fold and 3-fold interfaces involve a 20-residue C-terminal extension and a sequence signature, respectively, that are missing from monomeric eukaryotic GMPKs, explaining why ecGMPK forms oligomers. These signatures are found in GMPKs from proteobacteria, some of which are human pathogens. GMPKs from these bacteria are thus likely to form the same quaternary structures. The shift of the thermodynamic equilibrium towards the dimer at low ecGMPK concentration together with the observation that inter-subunit interactions partially occlude the ATP-binding site in the hexameric structure suggest that the dimer may be the active species at physiological enzyme concentration.
*[[Guanylate kinase|Guanylate kinase]]
 
*[[Guanylate kinase 3D structures|Guanylate kinase 3D structures]]
==About this Structure==
== References ==
2ANB 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=2ANB OCA].
<references/>
 
__TOC__
==Reference==
</StructureSection>
Calorimetric and crystallographic analysis of the oligomeric structure of Escherichia coli GMP kinase., Hible G, Renault L, Schaeffer F, Christova P, Zoe Radulescu A, Evrin C, Gilles AM, Cherfils J, J Mol Biol. 2005 Oct 7;352(5):1044-59. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16140325 16140325]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Guanylate kinase]]
[[Category: Large Structures]]
[[Category: Single protein]]
[[Category: Cherfils J]]
[[Category: Cherfils, J.]]
[[Category: Christova P]]
[[Category: Christova, P.]]
[[Category: Evrin C]]
[[Category: Evrin, C.]]
[[Category: Gilles AM]]
[[Category: Gilles, A M.]]
[[Category: Hible G]]
[[Category: Hible, G.]]
[[Category: Radulescu AZ]]
[[Category: Radulescu, A Z.]]
[[Category: Renault L]]
[[Category: Renault, L.]]
[[Category: Schaeffer F]]
[[Category: Schaeffer, F.]]
[[Category: gmp kinase]]
[[Category: guanylate kinase]]
[[Category: oligomeric]]
[[Category: transferase]]
 
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