1ekx

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[[Image:1ekx.jpg|left|200px]]
 
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==THE ISOLATED, UNREGULATED CATALYTIC TRIMER OF ASPARTATE TRANSCARBAMOYLASE COMPLEXED WITH BISUBSTRATE ANALOG PALA (N-(PHOSPHONACETYL)-L-ASPARTATE)==
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The line below this paragraph, containing "STRUCTURE_1ekx", creates the "Structure Box" on the page.
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<StructureSection load='1ekx' size='340' side='right'caption='[[1ekx]], [[Resolution|resolution]] 1.95&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1ekx]] is a 3 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=1EKX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EKX FirstGlance]. <br>
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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]] 1.95&#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=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=PAL:N-(PHOSPHONACETYL)-L-ASPARTIC+ACID'>PAL</scene></td></tr>
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{{STRUCTURE_1ekx| PDB=1ekx | SCENE= }}
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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=1ekx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ekx OCA], [https://pdbe.org/1ekx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ekx RCSB], [https://www.ebi.ac.uk/pdbsum/1ekx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ekx ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/PYRB_ECOLI PYRB_ECOLI]
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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/ek/1ekx_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=1ekx ConSurf].
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<div style="clear:both"></div>
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'''THE ISOLATED, UNREGULATED CATALYTIC TRIMER OF ASPARTATE TRANSCARBAMOYLASE COMPLEXED WITH BISUBSTRATE ANALOG PALA (N-(PHOSPHONACETYL)-L-ASPARTATE)'''
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==See Also==
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*[[Aspartate carbamoyltransferase 3D structures|Aspartate carbamoyltransferase 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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A central problem in understanding enzyme regulation is to define the conformational states that account for allosteric changes in catalytic activity. For Escherichia coli aspartate transcarbamoylase (ATCase; EC) the active, relaxed (R state) holoenzyme is generally assumed to be represented by the crystal structure of the complex of the holoenzyme with the bisubstrate analog N-phosphonacetyl-L-aspartate (PALA). It is unclear, however, which conformational differences between the unliganded, inactive, taut (T state) holoenzyme and the PALA complex are attributable to localized effects of inhibitor binding as contrasted to the allosteric transition. To define the conformational changes in the isolated, nonallosteric C trimer resulting from the binding of PALA, we determined the 1.95-A resolution crystal structure of the C trimer-PALA complex. In contrast to the free C trimer, the PALA-bound trimer exhibits approximate threefold symmetry. Conformational changes in the C trimer upon PALA binding include ordering of two active site loops and closure of the hinge relating the N- and C-terminal domains. The C trimer-PALA structure closely resembles the liganded C subunits in the PALA-bound holoenzyme. This similarity suggests that the pronounced hinge closure and other changes promoted by PALA binding to the holoenzyme are stabilized by ligand binding. Consequently, the conformational changes attributable to the allosteric transition of the holoenzyme remain to be defined.
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==About this Structure==
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1EKX 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=1EKX OCA].
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==Reference==
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Binding of bisubstrate analog promotes large structural changes in the unregulated catalytic trimer of aspartate transcarbamoylase: implications for allosteric regulation., Endrizzi JA, Beernink PT, Alber T, Schachman HK, Proc Natl Acad Sci U S A. 2000 May 9;97(10):5077-82. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10805770 10805770]
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[[Category: Aspartate carbamoyltransferase]]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Alber, T.]]
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[[Category: Alber T]]
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[[Category: Beernink, P T.]]
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[[Category: Beernink PT]]
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[[Category: Endrizzi, J A.]]
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[[Category: Endrizzi JA]]
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[[Category: Schachman, H K.]]
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[[Category: Schachman HK]]
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[[Category: Atcase catalytic subunit]]
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[[Category: Bisubstrate analog complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 15:13:36 2008''
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Current revision

THE ISOLATED, UNREGULATED CATALYTIC TRIMER OF ASPARTATE TRANSCARBAMOYLASE COMPLEXED WITH BISUBSTRATE ANALOG PALA (N-(PHOSPHONACETYL)-L-ASPARTATE)

PDB ID 1ekx

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