1dgd

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[[Image:1dgd.png|left|200px]]
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==AN ALKALI METAL ION SIZE-DEPENDENT SWITCH IN THE ACTIVE SITE STRUCTURE OF DIALKYLGLYCINE DECARBOXYLASE==
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<StructureSection load='1dgd' size='340' side='right' caption='[[1dgd]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1dgd]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Burkholderia_cepacia Burkholderia cepacia]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DGD OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1DGD FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=LI:LITHIUM+ION'>LI</scene>, <scene name='pdbligand=MES:2-(N-MORPHOLINO)-ETHANESULFONIC+ACID'>MES</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</scene><br>
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<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/2,2-dialkylglycine_decarboxylase_(pyruvate) 2,2-dialkylglycine decarboxylase (pyruvate)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.1.64 4.1.1.64] </span></td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1dgd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1dgd OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1dgd RCSB], [http://www.ebi.ac.uk/pdbsum/1dgd PDBsum]</span></td></tr>
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<table>
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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/dg/1dgd_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/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The pyridoxal 5'-phosphate-dependent enzyme dialkylglycine decarboxylase (DGD) is activated by K+ and Rb+ ions, whereas Li+ and Na+ ions are inhibitory. A binding site for alkali metal ions close to the active site (site 1) was discovered in the crystal structure of DGD, and an exchange of K+ for Na+ at this site was shown to affect the conformation of two active site residues [Toney, M. D., Hohenester, E., Cowan, S. W., &amp; Jansonius, J. N. (1993) Science 261, 756-759]. We have investigated the effects of alkali metal ions on DGD activity and have determined the crystal structures at 2.8 A resolution of DGD with Li+ and Rb+ bound at site 1. Due to the weak scattering of the Li+ ion, its position had to be modeled using information from small molecule structures. A comparison of the DGD structures with Li+, Na+, K+, and Rb+ bound at site 1 reveals a striking correlation between active site structure and enzymatic activity. The small, inhibitory ions Li+ and Na+ are accommodated by replacing two protein-derived ligands of the larger, activating ions K+ and Rb+ by a single water molecule. This actuates a two-state structural switch between active and inactive enzyme that involves a concerted reorientation of the active site residues Ser80 and Tyr301 and a small change in the quaternary structure of the DGD tetramer. An important role of the essential K+ ion in both cofactor binding and the organization of a catalytically competent active site structure is proposed. In the structure of DGD with Rb+ bound at site 1, a second Rb+ ion has partially replaced the structural Na+ ion at metal binding site 2 on the surface of the DGD molecule, without significantly altering the protein structure. In contrast to Na+, the Rb+ ion is bound with unfavorable geometry, and it is proposed that the rigid site 2 structure results in a pronounced selectivity for Na+ ions.
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{{STRUCTURE_1dgd| PDB=1dgd | SCENE= }}
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An alkali metal ion size-dependent switch in the active site structure of dialkylglycine decarboxylase.,Hohenester E, Keller JW, Jansonius JN Biochemistry. 1994 Nov 22;33(46):13561-70. PMID:7947767<ref>PMID:7947767</ref>
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===AN ALKALI METAL ION SIZE-DEPENDENT SWITCH IN THE ACTIVE SITE STRUCTURE OF DIALKYLGLYCINE DECARBOXYLASE===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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{{ABSTRACT_PUBMED_7947767}}
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== References ==
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<references/>
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==About this Structure==
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__TOC__
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[[1dgd]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Burkholderia_cepacia Burkholderia cepacia]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DGD OCA].
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</StructureSection>
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==Reference==
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<ref group="xtra">PMID:007947767</ref><references group="xtra"/>
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[[Category: Burkholderia cepacia]]
[[Category: Burkholderia cepacia]]
[[Category: Hohenester, E.]]
[[Category: Hohenester, E.]]
[[Category: Jansonius, J N.]]
[[Category: Jansonius, J N.]]
[[Category: Lyase]]
[[Category: Lyase]]

Revision as of 06:48, 4 September 2014

AN ALKALI METAL ION SIZE-DEPENDENT SWITCH IN THE ACTIVE SITE STRUCTURE OF DIALKYLGLYCINE DECARBOXYLASE

1dgd, resolution 2.80Å

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