4ao5: Difference between revisions
m Protected "4ao5" [edit=sysop:move=sysop] |
No edit summary |
||
| (7 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
The | ==B. subtilis prophage dUTPase YosS in complex with dUMP== | ||
<StructureSection load='4ao5' size='340' side='right'caption='[[4ao5]], [[Resolution|resolution]] 1.60Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4ao5]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4AO5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4AO5 FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.6Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=UMP:2-DEOXYURIDINE+5-MONOPHOSPHATE'>UMP</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=4ao5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ao5 OCA], [https://pdbe.org/4ao5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ao5 RCSB], [https://www.ebi.ac.uk/pdbsum/4ao5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ao5 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/YOSS_BACSU YOSS_BACSU] This enzyme is involved in nucleotide metabolism: it produces dUMP, the immediate precursor of thymidine nucleotides and it decreases the intracellular concentration of dUTP so that uracil cannot be incorporated into DNA. | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Homotrimeric dUTPases contain three active sites, each formed by five conserved sequence motifs originating from all three subunits. The essential fifth motif lies in a flexible C-terminal arm which becomes ordered during catalysis and is disordered in most crystal structures. Previously, it has been shown that the two Bacillus subtilis dUTPases, YncF and YosS, differ from their orthologues in the position in the sequence of the essential Phe-lid residue, which stacks against the uracil base, and in the conformation of the general base aspartate, which points away from the active site. Here, three structures of the complex of YncF with dU-PPi-Mg(2+) and the structure of YosS complexed with dUMP are reported. dU-PPi-Mg(2+) triggers the ordering of both the C-terminal arm and a loop (residues 18-26) which is uniquely disordered in the Bacillus dUTPases. The dUMP complex suggests two stages in substrate release. Limited proteolysis experiments allowed those complexes in which C-terminal cleavage is hindered and those in which it can be assumed to be ordered to be identified. The results lead to the suggestion that dUpNHpp is not a perfect substrate mimic, at least for the B. subtilis enzymes, and provide new insights into the mechanism of these two dUTPases in comparison to their orthologues. The enzyme mechanism is reviewed using the present and previous crystal structures as snapshots along the reaction coordinate. | |||
Tying down the arm in Bacillus dUTPase: structure and mechanism.,Garcia-Nafria J, Timm J, Harrison C, Turkenburg JP, Wilson KS Acta Crystallogr D Biol Crystallogr. 2013 Aug;69(Pt 8):1367-80. doi:, 10.1107/S090744491300735X. Epub 2013 Jul 13. PMID:23897460<ref>PMID:23897460</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 4ao5" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[DUTPase 3D structures|DUTPase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Bacillus subtilis]] | |||
[[Category: Large Structures]] | |||
[[Category: Garcia-Nafria J]] | |||
[[Category: Harrison C]] | |||
[[Category: Turkenburg JP]] | |||
[[Category: Wilson KS]] | |||
Latest revision as of 14:31, 20 December 2023
B. subtilis prophage dUTPase YosS in complex with dUMPB. subtilis prophage dUTPase YosS in complex with dUMP
Structural highlights
FunctionYOSS_BACSU This enzyme is involved in nucleotide metabolism: it produces dUMP, the immediate precursor of thymidine nucleotides and it decreases the intracellular concentration of dUTP so that uracil cannot be incorporated into DNA. Publication Abstract from PubMedHomotrimeric dUTPases contain three active sites, each formed by five conserved sequence motifs originating from all three subunits. The essential fifth motif lies in a flexible C-terminal arm which becomes ordered during catalysis and is disordered in most crystal structures. Previously, it has been shown that the two Bacillus subtilis dUTPases, YncF and YosS, differ from their orthologues in the position in the sequence of the essential Phe-lid residue, which stacks against the uracil base, and in the conformation of the general base aspartate, which points away from the active site. Here, three structures of the complex of YncF with dU-PPi-Mg(2+) and the structure of YosS complexed with dUMP are reported. dU-PPi-Mg(2+) triggers the ordering of both the C-terminal arm and a loop (residues 18-26) which is uniquely disordered in the Bacillus dUTPases. The dUMP complex suggests two stages in substrate release. Limited proteolysis experiments allowed those complexes in which C-terminal cleavage is hindered and those in which it can be assumed to be ordered to be identified. The results lead to the suggestion that dUpNHpp is not a perfect substrate mimic, at least for the B. subtilis enzymes, and provide new insights into the mechanism of these two dUTPases in comparison to their orthologues. The enzyme mechanism is reviewed using the present and previous crystal structures as snapshots along the reaction coordinate. Tying down the arm in Bacillus dUTPase: structure and mechanism.,Garcia-Nafria J, Timm J, Harrison C, Turkenburg JP, Wilson KS Acta Crystallogr D Biol Crystallogr. 2013 Aug;69(Pt 8):1367-80. doi:, 10.1107/S090744491300735X. Epub 2013 Jul 13. PMID:23897460[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
|
| ||||||||||||||||||