View source for 2zi6


==C4S dCK variant of dCK in complex with D-dA+UDP==
<StructureSection load='2zi6' size='340' side='right' caption='[[2zi6]], [[Resolution|resolution]] 1.77&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2zi6]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ZI6 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ZI6 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=3D1:(2R,3S,5R)-5-(6-AMINO-9H-PURIN-9-YL)-TETRAHYDRO-2-(HYDROXYMETHYL)FURAN-3-OL'>3D1</scene>, <scene name='pdbligand=UDP:URIDINE-5-DIPHOSPHATE'>UDP</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1p60|1p60]], [[2no1|2no1]], [[2no7|2no7]], [[2zi3|2zi3]], [[2zi4|2zi4]], [[2zi5|2zi5]], [[2zi7|2zi7]], [[2zi9|2zi9]], [[2zia|2zia]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">DCK ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Deoxycytidine_kinase Deoxycytidine kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.74 2.7.1.74] </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=2zi6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2zi6 OCA], [http://pdbe.org/2zi6 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2zi6 RCSB], [http://www.ebi.ac.uk/pdbsum/2zi6 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2zi6 ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/DCK_HUMAN DCK_HUMAN]] Required for the phosphorylation of the deoxyribonucleosides deoxycytidine (dC), deoxyguanosine (dG) and deoxyadenosine (dA). Has broad substrate specificity, and does not display selectivity based on the chirality of the substrate. It is also an essential enzyme for the phosphorylation of numerous nucleoside analogs widely employed as antiviral and chemotherapeutic agents.<ref>PMID:18377927</ref> <ref>PMID:20614893</ref>  
== 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/zi/2zi6_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=2zi6 ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Deoxycytidine kinase (dCK) is an essential nucleoside kinase critical for the production of nucleotide precursors for DNA synthesis. This enzyme catalyzes the initial conversion of the nucleosides deoxyadenosine (dA), deoxyguanosine (dG), and deoxycytidine (dC) into their monophosphate forms, with subsequent phosphorylation to the triphosphate forms performed by additional enzymes. Several nucleoside analog prodrugs are dependent on dCK for their pharmacological activation, and even nucleosides of the non-physiological L-chirality are phosphorylated by dCK. In addition to accepting dC and purine nucleosides (and their analogs) as phosphoryl acceptors, dCK can utilize either ATP or UTP as phosphoryl donors. To unravel the structural basis for substrate promiscuity of dCK at both the nucleoside acceptor and nucleotide donor sites, we solved the crystal structures of the enzyme as ternary complexes with the two enantiomeric forms of dA (D-dA, or L-dA), with either UDP or ADP bound to the donor site. The complexes with UDP revealed an open state of dCK in which the nucleoside, either D-dA or L-dA, is surprisingly bound in a manner not consistent with catalysis. In contrast, the complexes with ADP, with either D-dA or L-dA, adopted a closed and catalytically competent conformation. The differential states adopted by dCK in response to the nature of the nucleotide were also detected by tryptophan fluorescence experiments. Thus, we are in the unique position to observe differential effects at the acceptor site due to the nature of the nucleotide at the donor site, allowing us to rationalize the different kinetic properties observed with UTP to those with ATP.

Structural basis for substrate promiscuity of dCK.,Sabini E, Hazra S, Ort S, Konrad M, Lavie A J Mol Biol. 2008 May 2;378(3):607-21. Epub 2008 Mar 3. PMID:18377927<ref>PMID:18377927</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2zi6" style="background-color:#fffaf0;"></div>

==See Also==
*[[Deoxycytidine kinase|Deoxycytidine kinase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Deoxycytidine kinase]]
[[Category: Human]]
[[Category: Lavie, A]]
[[Category: Sabini, E]]
[[Category: Atp-binding]]
[[Category: D-da]]
[[Category: Dck]]
[[Category: Deoxyadenosine]]
[[Category: Enantiomer]]
[[Category: Nucleoside]]
[[Category: Nucleotide-binding]]
[[Category: Nucleus]]
[[Category: Phosphoprotein]]
[[Category: Purine]]
[[Category: Transferase]]
[[Category: Udp]]