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1nt4

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[[Image:1nt4.gif|left|200px]]<br /><applet load="1nt4" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1nt4, resolution 2.4&Aring;" />
 
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'''Crystal structure of Escherichia coli periplasmic glucose-1-phosphatase H18A mutant complexed with glucose-1-phosphate'''<br />
 
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==Overview==
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==Crystal structure of Escherichia coli periplasmic glucose-1-phosphatase H18A mutant complexed with glucose-1-phosphate==
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The Escherichia coli periplasmic glucose-1-phosphatase is a member of the histidine acid phosphatase family and acts primarily as a glucose scavenger. Previous substrate profiling studies have demonstrated some of the intriguing properties of the enzyme, including its unique and highly selective inositol phosphatase activity. The enzyme is also potentially involved in pathogenic inositol phosphate signal transduction pathways via type III secretion into the host cell. We have determined the crystal structure of E. coli glucose-1-phosphatase in an effort to unveil the structural mechanism underlying such unique substrate specificity. The structure was determined by the method of multiwavelength anomalous dispersion using a tungstate derivative together with the H18A inactive mutant complex structure with glucose 1-phosphate at 2.4-A resolution. In the active site of glucose-1-phosphatase, there are two unique gating residues, Glu-196 and Leu-24, in addition to the conserved features of histidine acid phosphatases. Together they create steric and electrostatic constraints responsible for the unique selectivity of the enzyme toward phytate and glucose-1-phosphate as well as its unusually high pH optimum for the latter. Based on the structural characterization, we were able to derive simple structural principles that not only precisely explains the substrate specificity of glucose-1-phosphatase and the hydrolysis products of various inositol phosphate substrates but also rationalizes similar general characteristics across the histidine acid phosphatase family.
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<StructureSection load='1nt4' size='340' side='right'caption='[[1nt4]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[1nt4]] is a 2 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=1NT4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1NT4 FirstGlance]. <br>
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1NT4 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=G1P:'>G1P</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Glucose-1-phosphatase Glucose-1-phosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.3.10 3.1.3.10] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NT4 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]] 2.4&#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=XGP:1-O-PHOSPHONO-BETA-D-GLUCOPYRANOSE'>XGP</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=1nt4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nt4 OCA], [https://pdbe.org/1nt4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1nt4 RCSB], [https://www.ebi.ac.uk/pdbsum/1nt4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1nt4 ProSAT], [https://www.topsan.org/Proteins/BSGI/1nt4 TOPSAN]</span></td></tr>
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Functional insights revealed by the crystal structures of Escherichia coli glucose-1-phosphatase., Lee DC, Cottrill MA, Forsberg CW, Jia Z, J Biol Chem. 2003 Aug 15;278(33):31412-8. Epub 2003 Jun 1. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12782623 12782623]
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/AGP_ECOLI AGP_ECOLI] Absolutely required for the growth of E.coli in a high-phosphate medium containing G-1-P as the sole carbon source.
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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/nt/1nt4_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=1nt4 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: Glucose-1-phosphatase]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Cottrill MA]]
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[[Category: BSGI, Montreal-Kingston Bacterial Structural Genomics Initiative.]]
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[[Category: Forsberg CW]]
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[[Category: Cottrill, M A.]]
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[[Category: Jia Z]]
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[[Category: Forsberg, C W.]]
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[[Category: Lee DC]]
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[[Category: Jia, Z.]]
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[[Category: Lee, D C.]]
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[[Category: G1P]]
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[[Category: alpha domain]]
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[[Category: alpha-beta domain]]
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[[Category: bsgi]]
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[[Category: enzyme-substrate complex]]
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[[Category: montreal-kingston bacterial structural genomics initiative]]
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[[Category: occluded active site]]
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[[Category: structural genomics]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:09:44 2008''
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Current revision

Crystal structure of Escherichia coli periplasmic glucose-1-phosphatase H18A mutant complexed with glucose-1-phosphate

PDB ID 1nt4

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