3hl2: Difference between revisions
New page: '''Unreleased structure''' The entry 3hl2 is ON HOLD Authors: Palioura, S., Steitz, T. A., Soll, D., Simonovic, M Description: The crystal structure of the human SepSecS-tRNASec comple... |
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The | ==The crystal structure of the human SepSecS-tRNASec complex== | ||
<StructureSection load='3hl2' size='340' side='right'caption='[[3hl2]], [[Resolution|resolution]] 2.81Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3hl2]] is a 5 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=3HL2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3HL2 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]] 2.81Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PLR:(5-HYDROXY-4,6-DIMETHYLPYRIDIN-3-YL)METHYL+DIHYDROGEN+PHOSPHATE'>PLR</scene>, <scene name='pdbligand=SEP:PHOSPHOSERINE'>SEP</scene>, <scene name='pdbligand=TS6:MONOTHIOPHOSPHATE'>TS6</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=3hl2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3hl2 OCA], [https://pdbe.org/3hl2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3hl2 RCSB], [https://www.ebi.ac.uk/pdbsum/3hl2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3hl2 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/SPCS_HUMAN SPCS_HUMAN] | |||
== 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/hl/3hl2_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=3hl2 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Selenocysteine is the only genetically encoded amino acid in humans whose biosynthesis occurs on its cognate transfer RNA (tRNA). O-Phosphoseryl-tRNA:selenocysteinyl-tRNA synthase (SepSecS) catalyzes the final step of selenocysteine formation by a poorly understood tRNA-dependent mechanism. The crystal structure of human tRNA(Sec) in complex with SepSecS, phosphoserine, and thiophosphate, together with in vivo and in vitro enzyme assays, supports a pyridoxal phosphate-dependent mechanism of Sec-tRNA(Sec) formation. Two tRNA(Sec) molecules, with a fold distinct from other canonical tRNAs, bind to each SepSecS tetramer through their 13-base pair acceptor-TPsiC arm (where Psi indicates pseudouridine). The tRNA binding is likely to induce a conformational change in the enzyme's active site that allows a phosphoserine covalently attached to tRNA(Sec), but not free phosphoserine, to be oriented properly for the reaction to occur. | |||
The human SepSecS-tRNASec complex reveals the mechanism of selenocysteine formation.,Palioura S, Sherrer RL, Steitz TA, Soll D, Simonovic M Science. 2009 Jul 17;325(5938):321-5. PMID:19608919<ref>PMID:19608919</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 3hl2" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Selenocysteine synthase|Selenocysteine synthase]] | |||
*[[Transfer RNA (tRNA)|Transfer RNA (tRNA)]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | |||
[[Category: Large Structures]] | |||
[[Category: Palioura S]] | |||
[[Category: Simonovic M]] | |||
[[Category: Soll D]] | |||
[[Category: Steitz TA]] | |||