3d1h: Difference between revisions
No edit summary |
No edit summary |
||
| Line 6: | Line 6: | ||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2b4p|2b4p]], [[2psz|2psz]], [[2pt0|2pt0]], [[1u24|1u24]], [[2b4u|2b4u]], [[3d1o|3d1o]], [[3d1q|3d1q]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2b4p|2b4p]], [[2psz|2psz]], [[2pt0|2pt0]], [[1u24|1u24]], [[2b4u|2b4u]], [[3d1o|3d1o]], [[3d1q|3d1q]]</td></tr> | ||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">phyA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=971 Selenomonas ruminantium])</td></tr> | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">phyA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=971 Selenomonas ruminantium])</td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3d1h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3d1h OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3d1h RCSB], [http://www.ebi.ac.uk/pdbsum/3d1h PDBsum]</span></td></tr> | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3d1h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3d1h OCA], [http://pdbe.org/3d1h PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3d1h RCSB], [http://www.ebi.ac.uk/pdbsum/3d1h PDBsum]</span></td></tr> | ||
</table> | </table> | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
| Line 16: | Line 16: | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
</jmolCheckbox> | </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/ | </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=3d1h ConSurf]. | ||
<div style="clear:both"></div> | <div style="clear:both"></div> | ||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
| Line 26: | Line 26: | ||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | </div> | ||
<div class="pdbe-citations 3d1h" style="background-color:#fffaf0;"></div> | |||
== References == | == References == | ||
<references/> | <references/> | ||
Revision as of 08:41, 10 February 2016
Structure of the PTP-Like Phytase Expressed by Selenomonas Ruminantium at an Ionic Strength of 500 mMStructure of the PTP-Like Phytase Expressed by Selenomonas Ruminantium at an Ionic Strength of 500 mM
Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe protein tyrosine phosphatase (PTP)-like phytase, PhyAsr, from Selenomonas ruminantium is a novel member of the PTP superfamily, and the only described member that hydrolyzes myo-inositol-1,2,3,4,5,6-hexakisphosphate. In addition to the unique substrate specificity of PhyAsr, the phosphate-binding loop (P-loop) has been reported to undergo a conformational change from an open (inactive) to a closed (active) conformation upon ligand binding at low ionic strength. At high ionic strengths, the P-loop was observed in the closed, active conformation in both the presence and absence of ligand. To test whether the P-loop movement can be induced by changes in ionic strength, we examined the effect that ionic strength has on the catalytic efficiency of PhyAsr, and determined the structure of the enzyme at several ionic strengths. The catalytic efficiency of PhyAsr is highly sensitive to ionic strength, with a seven-fold increase in k(cat)/K(m) and a ninefold decrease in K(m) when the ionic strength is increased from 100 to 500 mm. Surprisingly, the P-loop is observed in the catalytically competent conformation at all ionic strengths, despite the absence of a ligand. Here we provide structural evidence that the ionic strength dependence of PhyAsr and the conformational change in the P-loop are not linked. Furthermore, we demonstrate that the previously reported P-loop conformational change is a result of irreversible oxidation of the active site thiolate. Finally, we rationalize the observed P-loop conformational changes observed in all oxidized PTP structures. Effect of ionic strength and oxidation on the P-loop conformation of the protein tyrosine phosphatase-like phytase, PhyAsr.,Gruninger RJ, Selinger LB, Mosimann SC FEBS J. 2008 Aug;275(15):3783-92. PMID:18573100[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
|
| ||||||||||||||||||||