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== | ==CRYSTAL STRUCTURE OF UNLIGANDED S. AUREUS THYMIDYLATE KINASE== | ||
Methicillin-resistant Staphylococcus aureus (MRSA) poses a major threat to | <StructureSection load='2cck' size='340' side='right'caption='[[2cck]], [[Resolution|resolution]] 2.21Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2cck]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2CCK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2CCK 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]] 2.21Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</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=2cck FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2cck OCA], [https://pdbe.org/2cck PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2cck RCSB], [https://www.ebi.ac.uk/pdbsum/2cck PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2cck ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/KTHY_STAAM KTHY_STAAM] Phosphorylation of dTMP to form dTDP in both de novo and salvage pathways of dTTP synthesis (By similarity). | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cc/2cck_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</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/main_output.php?pdb_ID=2cck ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Methicillin-resistant Staphylococcus aureus (MRSA) poses a major threat to human health, particularly through hospital acquired infection. The spread of MRSA means that novel targets are required to develop potential inhibitors to combat infections caused by such drug-resistant bacteria. Thymidylate kinase (TMK) is attractive as an antibacterial target as it is essential for providing components for DNA synthesis. Here, we report crystal structures of unliganded and thymidylate-bound forms of S. aureus thymidylate kinase (SaTMK). His-tagged and untagged SaTMK crystallize with differing lattice packing and show variations in conformational states for unliganded and thymidylate (TMP) bound forms. In addition to open and closed forms of SaTMK, an intermediate conformation in TMP binding is observed, in which the site is partially closed. Analysis of these structures indicates a sequence of events upon TMP binding, with helix alpha3 shifting position initially, followed by movement of alpha2 to close the substrate site. In addition, we observe significant conformational differences in the TMP-binding site in SaTMK as compared to available TMK structures from other bacterial species, Escherichia coli and Mycobacterium tuberculosis as well as human TMK. In SaTMK, Arg 48 is situated at the base of the TMP-binding site, close to the thymine ring, whereas a cis-proline occupies the equivalent position in other TMKs. The observed TMK structural differences mean that design of compounds highly specific for the S. aureus enzyme looks possible; such inhibitors could minimize the transfer of drug resistance between different bacterial species. | |||
Structures of S. aureus thymidylate kinase reveal an atypical active site configuration and an intermediate conformational state upon substrate binding.,Kotaka M, Dhaliwal B, Ren J, Nichols CE, Angell R, Lockyer M, Hawkins AR, Stammers DK Protein Sci. 2006 Apr;15(4):774-84. Epub 2006 Mar 7. PMID:16522804<ref>PMID:16522804</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
[[Category: | <div class="pdbe-citations 2cck" style="background-color:#fffaf0;"></div> | ||
==See Also== | |||
*[[Thymidylate kinase 3D structures|Thymidylate kinase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Staphylococcus aureus]] | [[Category: Staphylococcus aureus]] | ||
[[Category: Angell R]] | |||
[[Category: Angell | [[Category: Dhaliwal B]] | ||
[[Category: Dhaliwal | [[Category: Hawkins AR]] | ||
[[Category: Hawkins | [[Category: Kotaka M]] | ||
[[Category: Kotaka | [[Category: Lockyer M]] | ||
[[Category: Lockyer | [[Category: Nichols CE]] | ||
[[Category: Nichols | [[Category: Ren J]] | ||
[[Category: Ren | [[Category: Stammers DK]] | ||
[[Category: Stammers | |||