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New page: left|200px<br /><applet load="1jyl" size="450" color="white" frame="true" align="right" spinBox="true" caption="1jyl, resolution 2.4Å" /> '''Catalytic Mechanism o...
 
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[[Image:1jyl.gif|left|200px]]<br /><applet load="1jyl" size="450" color="white" frame="true" align="right" spinBox="true"
caption="1jyl, resolution 2.4&Aring;" />
'''Catalytic Mechanism of CTP:phosphocholine Cytidylytransferase from Streptococcus pneumoniae (LicC)'''<br />


==Overview==
==Catalytic Mechanism of CTP:phosphocholine Cytidylyltransferase from Streptococcus pneumoniae (LicC)==
Pneumococcal LicC is a member of the nucleoside triphosphate transferase, superfamily and catalyzes the transfer of a cytidine monophosphate from, CTP to phosphocholine to form CDP-choline. The structures of apo-LicC and, the LicC-CDP-choline-Mg(2+) ternary complex were determined, and the, comparison of these structures reveals a significant conformational change, driven by the multivalent coordination of Mg(2+). The key event is, breaking the Glu(216)-Arg(129) salt bridge, which triggers the coalescence, of four individual beta-strands into two extended beta-sheets. These, movements reorient the side chains of Trp(136) and Tyr(190) for the, optimal binding and alignment of the phosphocholine moiety. Consistent, with these conformational changes, LicC operates via a compulsory ordered, kinetic mechanism. The structures explain the substrate specificity of, LicC for CTP and phosphocholine and implicate a direct role for Mg(2+) in, aligning phosphocholine for in-line nucleophilic attack and stabilizing, the negative charge that develops in the pentacoordinate transition state., These results provide a structural basis for assigning a specific role for, magnesium in the catalytic mechanism of pneumococcal LicC.
<StructureSection load='1jyl' size='340' side='right'caption='[[1jyl]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
 
== Structural highlights ==
==About this Structure==
<table><tr><td colspan='2'>[[1jyl]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_pneumoniae Streptococcus pneumoniae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JYL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1JYL FirstGlance]. <br>
1JYL is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Streptococcus_pneumoniae Streptococcus pneumoniae] with MG and CDC as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1JYL OCA].  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.4&#8491;</td></tr>
 
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CDC:[2-CYTIDYLATE-O-PHOSPHONYLOXYL]-ETHYL-TRIMETHYL-AMMONIUM'>CDC</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
==Reference==
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1jyl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jyl OCA], [https://pdbe.org/1jyl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1jyl RCSB], [https://www.ebi.ac.uk/pdbsum/1jyl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1jyl ProSAT]</span></td></tr>
Structure and mechanism of CTP:phosphocholine cytidylyltransferase (LicC) from Streptococcus pneumoniae., Kwak BY, Zhang YM, Yun M, Heath RJ, Rock CO, Jackowski S, Park HW, J Biol Chem. 2002 Feb 8;277(6):4343-50. Epub 2001 Nov 12. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11706035 11706035]
</table>
[[Category: Single protein]]
== Function ==
[https://www.uniprot.org/uniprot/A0A0H2UQB5_STRPN A0A0H2UQB5_STRPN]
== 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/jy/1jyl_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=1jyl ConSurf].
<div style="clear:both"></div>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptococcus pneumoniae]]
[[Category: Streptococcus pneumoniae]]
[[Category: Kwak, B.Y.]]
[[Category: Kwak B-Y]]
[[Category: Park, H.w.]]
[[Category: Park H-w]]
[[Category: Yun, M.]]
[[Category: Yun M]]
[[Category: CDC]]
[[Category: MG]]
[[Category: 3d structure]]
[[Category: ctp:phosphocholine cytidylyltransferase]]
[[Category: licc]]
 
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