View source for 6n55


==Crystal structure of human uridine-cytidine kinase 2 complexed with 2'-azidouridine==
<StructureSection load='6n55' size='340' side='right'caption='[[6n55]], [[Resolution|resolution]] 3.08&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6n55]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6N55 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6N55 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]] 3.085&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=UZ0:2-azido-2-deoxyuridine'>UZ0</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=6n55 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6n55 OCA], [https://pdbe.org/6n55 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6n55 RCSB], [https://www.ebi.ac.uk/pdbsum/6n55 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6n55 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/UCK2_HUMAN UCK2_HUMAN] Phosphorylates uridine and cytidine to uridine monophosphate and cytidine monophosphate. Does not phosphorylate deoxyribonucleosides or purine ribonucleosides. Can use ATP or GTP as a phosphate donor. Can also phosphorylate cytidine and uridine nucleoside analogs such as 6-azauridine, 5-fluorouridine, 4-thiouridine, 5-bromouridine, N(4)-acetylcytidine, N(4)-benzoylcytidine, 5-fluorocytidine, 2-thiocytidine, 5-methylcytidine, and N(4)-anisoylcytidine.
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== Publication Abstract from PubMed ==
Tissues and organs are composed of diverse cell types, which poses a major challenge for cell-type-specific profiling of gene expression. Current metabolic labeling methods rely on exogenous pyrimidine analogs that are only incorporated into RNA in cells expressing an exogenous enzyme. This approach assumes that off-target cells cannot incorporate these analogs. We disprove this assumption and identify and characterize the enzymatic pathways responsible for high background incorporation. We demonstrate that mammalian cells can incorporate uracil analogs and characterize the enzymatic pathways responsible for high background incorporation. To overcome these limitations, we developed a new small molecule-enzyme pair consisting of uridine/cytidine kinase 2 and 2'-azidouridine. We demonstrate that 2'-azidouridine is only incorporated in cells expressing uridine/cytidine kinase 2 and characterize selectivity mechanisms using molecular dynamics and X-ray crystallography. Furthermore, this pair can be used to purify and track RNA from specific cellular populations, making it ideal for high-resolution cell-specific RNA labeling. Overall, these results reveal new aspects of mammalian salvage pathways and serve as a new benchmark for designing, characterizing and evaluating methodologies for cell-specific labeling of biomolecules.

An optimized chemical-genetic method for cell-specific metabolic labeling of RNA.,Nainar S, Cuthbert BJ, Lim NM, England WE, Ke K, Sophal K, Quechol R, Mobley DL, Goulding CW, Spitale RC Nat Methods. 2020 Feb 3. pii: 10.1038/s41592-019-0726-y. doi:, 10.1038/s41592-019-0726-y. PMID:32015544<ref>PMID:32015544</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 6n55" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Cuthbert BJ]]
[[Category: Goulding CW]]
[[Category: Nainar S]]
[[Category: Spitale RC]]