6ogm: Difference between revisions
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==Crystal structure of apo unFused 4-OT== | |||
<StructureSection load='6ogm' size='340' side='right'caption='[[6ogm]], [[Resolution|resolution]] 1.86Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[6ogm]] is a 12 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6OGM OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6OGM FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene></td></tr> | |||
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[6blm|6blm]]</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=6ogm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ogm OCA], [http://pdbe.org/6ogm PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6ogm RCSB], [http://www.ebi.ac.uk/pdbsum/6ogm PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6ogm ProSAT]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
A 4-oxalocrotonate tautomerase (4-OT) trimer has been isolated from Burkholderia lata, and a kinetic, mechanistic, and structural analysis has been performed. The enzyme is the third described oligomer state for 4-OT along with a homo- and heterohexamer. The 4-OT trimer is part of a small subset of sequences (133 sequences) within the 4-OT subgroup of the tautomerase superfamily (TSF). The TSF has two distinct features: members are composed of a single beta-alpha-beta unit (homo- and heterohexamer) or two consecutively joined beta-alpha-beta units (trimer) and generally have a catalytic amino-terminal proline. The enzyme, designated as fused 4-OT, functions as a 4-OT where the active site groups (Pro-1, Arg-39, Arg-76, Phe-115, Arg-127) mirror those in the canonical 4-OT from Pseudomonas putida mt-2. Inactivation by 2-oxo-3-pentynoate suggests that Pro-1 of fused 4-OT has a low p Ka enabling the prolyl nitrogen to function as a general base. A remarkable feature of the fused 4-OT is the absence of P3 rotational symmetry in the structure (1.5 A resolution). The asymmetric arrangement of the trimer is not due to the fusion of the two beta-alpha-beta building blocks because an engineered "unfused" variant that breaks the covalent bond between the two units (to generate a heterohexamer) assumes the same asymmetric oligomerization state. It remains unknown how the different active site configurations contribute to the observed overall activities and whether the asymmetry has a biological purpose or role in the evolution of TSF members. | |||
Structural, Kinetic, and Mechanistic Analysis of an Asymmetric 4-Oxalocrotonate Tautomerase Trimer.,Baas BJ, Medellin BP, LeVieux JA, de Ruijter M, Zhang YJ, Brown SD, Akiva E, Babbitt PC, Whitman CP Biochemistry. 2019 Jun 4;58(22):2617-2627. doi: 10.1021/acs.biochem.9b00303. Epub, 2019 May 23. PMID:31074977<ref>PMID:31074977</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 6ogm" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Medellin, B P]] | |||
[[Category: Whitman, C P]] | |||
[[Category: Zhang, Y J]] | |||
[[Category: Hydrolase]] | |||
