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| | <StructureSection load='3r4c' size='340' side='right'caption='[[3r4c]], [[Resolution|resolution]] 1.82Å' scene=''> | | <StructureSection load='3r4c' size='340' side='right'caption='[[3r4c]], [[Resolution|resolution]] 1.82Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[3r4c]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/"bacillus_thetaiotaomicron"_distaso_1912 "bacillus thetaiotaomicron" distaso 1912]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3R4C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3R4C FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[3r4c]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacteroides_thetaiotaomicron Bacteroides thetaiotaomicron]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3R4C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3R4C FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.82Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">BT1666, BT_1666 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=818 "Bacillus thetaiotaomicron" Distaso 1912])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> |
| | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3r4c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3r4c OCA], [https://pdbe.org/3r4c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3r4c RCSB], [https://www.ebi.ac.uk/pdbsum/3r4c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3r4c ProSAT]</span></td></tr> | | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3r4c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3r4c OCA], [https://pdbe.org/3r4c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3r4c RCSB], [https://www.ebi.ac.uk/pdbsum/3r4c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3r4c ProSAT]</span></td></tr> |
| | </table> | | </table> |
| - | <div style="background-color:#fffaf0;">
| + | == Function == |
| - | == Publication Abstract from PubMed == | + | [https://www.uniprot.org/uniprot/Q8A759_BACTN Q8A759_BACTN] |
| - | Analysis of the haloalkanoate dehalogenase superfamily (HADSF) has uncovered homologues occurring within the same organism that are found to possess broad, overlapping substrate specificities, and low catalytic efficiencies. Here we compare the HADSF phosphatase BT1666 from Bacteroides thetaiotaomicron VPI-5482 to a homologue with high sequence identity (40%) from the same organism BT4131, a known hexose-phosphate phosphatase. The goal is to find whether these enzymes represent duplicated versus paralogous activities. The X-ray crystal structure of BT1666 was determined to 1.82 A resolution. Superposition of the BT1666 and BT4131 structures revealed a conserved fold and identical active sites suggestive of a common physiological substrate. The steady-state kinetic constants for BT1666 were determined for a diverse panel of phosphorylated metabolites to define its substrate specificity profile and overall level of catalytic efficiency. Whereas BT1666 and BT4131 are both promiscuous, their substrate specificity profiles are distinct. The catalytic efficiency of BT1666 (k(cat) /K(m) = 4.4 x 10(2) M(-1) s(-1) for the best substrate fructose 1,6-(bis)phosphate) is an order of magnitude less than that of BT4131 (k(cat) /K(m) = 6.7 x 10(3) M(-1) s(-1) for 2-deoxyglucose 6-phosphate). The seemingly identical active-site structures point to sequence variation outside the active site causing differences in conformational dynamics or subtle catalytic positioning effects that drive the divergence in catalytic efficiency and selectivity. The overlapping substrate profiles may be understood in terms of differential regulation of expression of the two enzymes or a conferred advantage in metabolic housekeeping functions by having a larger range of possible metabolites as substrates. Proteins 2011;. (c) 2011 Wiley-Liss, Inc.
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| - | The X-ray crystallographic structure and specificity profile of HAD superfamily phosphohydrolase BT1666: Comparison of paralogous functions in B. thetaiotaomicron.,Lu Z, Dunaway-Mariano D, Allen KN Proteins. 2011 Nov;79(11):3099-107. doi: 10.1002/prot.23137. Epub 2011 Aug, 30. PMID:21989931<ref>PMID:21989931</ref>
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| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| + | |
| - | </div>
| + | |
| - | <div class="pdbe-citations 3r4c" style="background-color:#fffaf0;"></div>
| + | |
| - | == References ==
| + | |
| - | <references/>
| + | |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Bacillus thetaiotaomicron distaso 1912]] | + | [[Category: Bacteroides thetaiotaomicron]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Allen, K N]] | + | [[Category: Allen KN]] |
| - | [[Category: Dunaway-Mariano, D]] | + | [[Category: Dunaway-Mariano D]] |
| - | [[Category: Lu, Z]] | + | [[Category: Lu Z]] |
| - | [[Category: Haloalkanoate dehalogenase enzyme superfamily]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| - | [[Category: Phosphohydrolase]]
| + | |
