View source for 1ytk


==Crystal structure of a nicotinate phosphoribosyltransferase from Thermoplasma acidophilum with nicotinate mononucleotide==
<StructureSection load='1ytk' size='340' side='right'caption='[[1ytk]], [[Resolution|resolution]] 2.65&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ytk]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermoplasma_acidophilum_DSM_1728 Thermoplasma acidophilum DSM 1728]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YTK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1YTK 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]] 2.65&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NCN:NICOTINATE+MONONUCLEOTIDE'>NCN</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</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=1ytk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ytk OCA], [https://pdbe.org/1ytk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ytk RCSB], [https://www.ebi.ac.uk/pdbsum/1ytk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ytk ProSAT], [https://www.topsan.org/Proteins/BSGC/1ytk TOPSAN]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PNCB_THEAC PNCB_THEAC] Catalyzes the transfer of the phosphoribosyl moiety of phosphoribosylpyrophosphate (PRPP) onto nicotinate (NA) to yield nicotinate mononucleotide (NAMN), an intermediate in the biosynthesis of NAD.  Catalyzes the synthesis of beta-nicotinate D-ribonucleotide from nicotinate and 5-phospho-D-ribose 1-phosphate at the expense of ATP.
== 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/yt/1ytk_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1ytk ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
We have determined the crystal structure of nicotinate phosphoribosyltransferase from Themoplasma acidophilum (TaNAPRTase). The TaNAPRTase has three domains, an N-terminal domain, a central functional domain, and a unique C-terminal domain. The crystal structure revealed that the functional domain has a type II phosphoribosyltransferase fold that may be a common architecture for both nicotinic acid and quinolinic acid (QA) phosphoribosyltransferases (PRTase) despite low sequence similarity between them. Unlike QAPRTase, TaNAPRTase has a unique extra C-terminal domain containing a zinc knuckle-like motif containing 4 cysteines. The TaNAPRTase forms a trimer of dimers in the crystal. The active site pocket is formed at dimer interfaces. The complex structures with phosphoribosylpyrophosphate (PRPP) and nicotinate mononucleotide (NAMN) showed, surprisingly, that functional residues lining on the active site of TaNAPRTase are quite different from those of QAPRTase, although their substrates are quite similar to each other. The phosphate moiety of PRPP and NAMN is anchored to the phosphate-binding loops formed by backbone amides, as found in many alpha/beta barrel enzymes. The pyrophosphate moiety of PRPP is located at the entrance of the active site pocket, whereas the nicotinate moiety of NAMN is located deep inside. Interestingly, the nicotinate moiety of NAMN is intercalated between highly conserved aromatic residues Tyr(21) and Phe(138). Careful structural analyses combined with other NAPRTase sequence subfamilies reveal that TaNAPRTase represents a unique sequence subfamily of NAPRTase. The structures of TaNAPRTase also provide valuable insight for other sequence subfamilies such as pre-B cell colony-enhancing factor, known to have nicotinamide phosphoribosyltransferase activity.

Crystal structure of a nicotinate phosphoribosyltransferase from Thermoplasma acidophilum.,Shin DH, Oganesyan N, Jancarik J, Yokota H, Kim R, Kim SH J Biol Chem. 2005 May 6;280(18):18326-35. Epub 2005 Mar 6. PMID:15753098<ref>PMID:15753098</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1ytk" style="background-color:#fffaf0;"></div>

==See Also==
*[[Phosphoribosyltransferase 3D structures|Phosphoribosyltransferase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Thermoplasma acidophilum DSM 1728]]
[[Category: Shin DH]]