View source for 5ztb


==Structure of Sulfurtransferase==
<StructureSection load='5ztb' size='340' side='right'caption='[[5ztb]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5ztb]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_thermophilus_HB27 Thermus thermophilus HB27]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5ZTB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5ZTB 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]] 2.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=5ztb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5ztb OCA], [https://pdbe.org/5ztb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5ztb RCSB], [https://www.ebi.ac.uk/pdbsum/5ztb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5ztb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TTUB_THET2 TTUB_THET2] Required for the 2-thiolation of 5-methyluridine residue at position 54 in the T loop of tRNAs, leading to 5-methyl-2-thiouridine (m(5)s(2)U or s(2)T) (PubMed:16547008, PubMed:28439027). This modification allows thermal stabilization of tRNAs in thermophilic microorganisms, and is essential for cell growth at high temperatures (PubMed:16547008). Thiocarboxylated TtuB functions as the sulfur donor in the sulfurtransferase reaction catalyzed by TtuA (PubMed:28439027, PubMed:19037260). TtuB also functions as a protein modifier covalently attached to lysine residues of the target proteins TtuA and TtuC (PubMed:22467871). TtuB conjugation might play a regulatory role to ensure appropriate sulfur transfer in cells (PubMed:22467871).<ref>PMID:16547008</ref> <ref>PMID:19037260</ref> <ref>PMID:22467871</ref> <ref>PMID:28439027</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
TtuA and TtuB are the sulfurtransferase and sulfur donor proteins, respectively, for biosynthesis of 2-thioribothymidine (s(2)T) at position 54 of transfer RNA (tRNA), which is responsible for adaptation to high temperature environments in Thermus thermophilus. The enzymatic activity of TtuA requires an iron-sulfur (Fe-S) cluster, by which a sulfur atom supplied by TtuB is transferred to the tRNA substrate. Here, we demonstrate that the Fe-S cluster directly receives sulfur from TtuB through its inherent coordination ability. TtuB forms a [4Fe-4S]-TtuB intermediate, but that sulfur is not immediately released from TtuB. Further desulfurization assays and mutation studies demonstrated that the release of sulfur from the thiocarboxylated C-terminus of TtuB is dependent on adenylation of the substrate tRNA, and the essential residue for TtuB desulfurization was identified. Based on these findings, the molecular mechanism of sulfur transfer from TtuB to Fe-S cluster is proposed.

The [4Fe-4S] cluster of sulfurtransferase TtuA desulfurizes TtuB during tRNA modification in Thermus thermophilus.,Chen M, Ishizaka M, Narai S, Horitani M, Shigi N, Yao M, Tanaka Y Commun Biol. 2020 Apr 7;3(1):168. doi: 10.1038/s42003-020-0895-3. PMID:32265486<ref>PMID:32265486</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5ztb" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Thermus thermophilus HB27]]
[[Category: Chen M]]
[[Category: Narai S]]
[[Category: Tanaka Y]]
[[Category: Yao M]]