|
|
| Line 1: |
Line 1: |
|
| |
|
| ==X-ray structure of L-Threonine Aldolase (low-specificity) in complex with L-allo-threonine== | | ==X-ray structure of L-Threonine Aldolase (low-specificity) in complex with L-allo-threonine== |
| <StructureSection load='1lw4' size='340' side='right'caption='[[1lw4]], [[Resolution|resolution]] 1.90Å' scene=''> | | <StructureSection load='1lw4' size='340' side='right'caption='[[1lw4]]' scene=''> |
| == Structural highlights == | | == Structural highlights == |
| <table><tr><td colspan='2'>[[1lw4]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_43589 Atcc 43589]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LW4 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1LW4 FirstGlance]. <br> | | <table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LW4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1LW4 FirstGlance]. <br> |
| </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</scene>, <scene name='pdbligand=TLP:3-HYDROXY-2-[(3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHYL)-AMINO]-BUTYRIC+ACID'>TLP</scene></td></tr> | | </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=1lw4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lw4 OCA], [https://pdbe.org/1lw4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1lw4 RCSB], [https://www.ebi.ac.uk/pdbsum/1lw4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1lw4 ProSAT], [https://www.topsan.org/Proteins/NYSGXRC/1lw4 TOPSAN]</span></td></tr> |
| <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=LLP:(2S)-2-AMINO-6-[[3-HYDROXY-2-METHYL-5-(PHOSPHONOOXYMETHYL)PYRIDIN-4-YL]METHYLIDENEAMINO]HEXANOIC+ACID'>LLP</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
| |
| <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1lw5|1lw5]], [[1m6s|1m6s]]</td></tr>
| |
| <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/L-threonine_aldolase L-threonine aldolase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.2.5 4.1.2.5] </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=1lw4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1lw4 OCA], [http://pdbe.org/1lw4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1lw4 RCSB], [http://www.ebi.ac.uk/pdbsum/1lw4 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1lw4 ProSAT], [http://www.topsan.org/Proteins/NYSGXRC/1lw4 TOPSAN]</span></td></tr> | |
| </table> | | </table> |
| == Evolutionary Conservation == | | == Evolutionary Conservation == |
| Line 20: |
Line 16: |
| </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=1lw4 ConSurf]. | | </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=1lw4 ConSurf]. |
| <div style="clear:both"></div> | | <div style="clear:both"></div> |
| <div style="background-color:#fffaf0;">
| |
| == Publication Abstract from PubMed ==
| |
| L-Threonine acetaldehyde-lyase (threonine aldolase, TA) is a pyridoxal-5'-phosphate-dependent (PLP) enzyme that catalyzes conversion of L-threonine or L-allo-threonine to glycine and acetaldehyde in a secondary glycine biosynthetic pathway. X-ray structures of Thermatoga maritima TA have been determined as the apo-enzyme at 1.8 A resolution and bound to substrate L-allo-threonine and product glycine at 1.9 and 2.0 A resolution, respectively. Despite low pairwise sequence identities, TA is a member of aspartate aminotransferase (AATase) fold family of PLP enzymes. The enzyme forms a 222 homotetramer with the PLP cofactor bound via a Schiff-base linkage to Lys199 within a domain interface. The structure reveals bound calcium and chloride ions that appear to contribute to catalysis and oligomerization, respectively. Although L-threonine and L-allo-threonine are substrates for T. maritima TA, enzymatic assays revealed a strong preference for L-allo-threonine. Structures of the external aldimines with substrate/product reveal a pair of histidines that may provide flexibility in substrate recognition. Variation in the threonine binding pocket may explain preferences for L-allo-threonine versus L-threonine among TA family members.
| |
|
| |
| X-ray structures of threonine aldolase complexes: structural basis of substrate recognition.,Kielkopf CL, Burley SK Biochemistry. 2002 Oct 1;41(39):11711-20. PMID:12269813<ref>PMID:12269813</ref>
| |
|
| |
| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| |
| </div>
| |
| <div class="pdbe-citations 1lw4" style="background-color:#fffaf0;"></div>
| |
|
| |
|
| ==See Also== | | ==See Also== |
| *[[Aldolase 3D structures|Aldolase 3D structures]] | | *[[Aldolase 3D structures|Aldolase 3D structures]] |
| == References ==
| |
| <references/>
| |
| __TOC__ | | __TOC__ |
| </StructureSection> | | </StructureSection> |
| [[Category: Atcc 43589]]
| |
| [[Category: L-threonine aldolase]]
| |
| [[Category: Large Structures]] | | [[Category: Large Structures]] |
| [[Category: Burley, S K]] | | [[Category: Burley SK]] |
| [[Category: Kielkopf, C L]] | | [[Category: Kielkopf CL]] |
| [[Category: Structural genomic]]
| |
| [[Category: Enzyme]]
| |
| [[Category: Lyase]]
| |
| [[Category: NYSGXRC, New York SGX Research Center for Structural Genomics]]
| |
| [[Category: Plp]]
| |
| [[Category: Product complex]]
| |
| [[Category: PSI, Protein structure initiative]]
| |
| [[Category: Pyridoxal-5-phosphate]]
| |
| [[Category: Threonine]]
| |
