View source for 3aje


==Crystal structure of S. tokodaii Sua5 complexed with L-threonine and AMPPNP==
<StructureSection load='3aje' size='340' side='right'caption='[[3aje]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3aje]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Sulfurisphaera_tokodaii_str._7 Sulfurisphaera tokodaii str. 7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AJE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3AJE 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]] 1.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ANP:PHOSPHOAMINOPHOSPHONIC+ACID-ADENYLATE+ESTER'>ANP</scene>, <scene name='pdbligand=NO3:NITRATE+ION'>NO3</scene>, <scene name='pdbligand=THR:THREONINE'>THR</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=3aje FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3aje OCA], [https://pdbe.org/3aje PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3aje RCSB], [https://www.ebi.ac.uk/pdbsum/3aje PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3aje ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SUA5_SULTO SUA5_SULTO] Required for the formation of a threonylcarbamoyl group on adenosine at position 37 (t(6)A37) in tRNAs that read codons beginning with adenine (By similarity). Probably catalyzes the conversion of L-threonine, bicarbonate/CO(2) and ATP to give threonylcarbamoyl-AMP (TC-AMP) as the acyladenylate intermediate, with the release of pyrophosphate. Shows ATP hydrolysis activity in vitro, producing AMP.<ref>PMID:22383337</ref> 
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== Publication Abstract from PubMed ==
The hypermodified nucleoside N(6)-threonylcarbamoyladenosine resides at position 37 of tRNA molecules bearing U at position 36 and maintains translational fidelity in the three kingdoms of life. The N(6)-threonylcarbamoyl moiety is composed of L-threonine and bicarbonate, and its synthesis was genetically shown to require YrdC/Sua5. YrdC/Sua5 binds to tRNA and ATP. In this study, we analyzed the L-threonine-binding mode of Sua5 from the archaeon Sulfolobus tokodaii. Isothermal titration calorimetry measurements revealed that S. tokodaii Sua5 binds L-threonine more strongly than L-serine and glycine. The Kd values of Sua5 for L-threonine and L-serine are 9.3 muM and 2.6 mM, respectively. We determined the crystal structure of S. tokodaii Sua5, complexed with AMPPNP and L-threonine, at 1.8 A resolution. The L-threonine is bound next to AMPPNP in the same pocket of the N-terminal domain. Thr118 and two water molecules form hydrogen bonds with AMPPNP in a unique manner for adenine-specific recognition. The carboxyl group and the side-chain hydroxyl and methyl groups of L-threonine are buried deep in the pocket, whereas the amino group faces AMPPNP. The L-threonine is located in a suitable position to react together with ATP for the synthesis of N(6)-threonylcarbamoyladenosine.

Crystal structure of Sulfolobus tokodaii Sua5 complexed with L-threonine and AMPPNP.,Kuratani M, Kasai T, Akasaka R, Higashijima K, Terada T, Kigawa T, Shinkai A, Bessho Y, Yokoyama S Proteins. 2011 Jul;79(7):2065-75. doi: 10.1002/prot.23026. Epub 2011 May 2. PMID:21538543<ref>PMID:21538543</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 3aje" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Sulfurisphaera tokodaii str. 7]]
[[Category: Kuratani M]]
[[Category: Yokoyama S]]