View source for 3gzc


==Structure of human selenocysteine lyase==
<StructureSection load='3gzc' size='340' side='right'caption='[[3gzc]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3gzc]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=2hdy 2hdy]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3GZC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3GZC 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]] 2.1&#8491;</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></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=3gzc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3gzc OCA], [https://pdbe.org/3gzc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3gzc RCSB], [https://www.ebi.ac.uk/pdbsum/3gzc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3gzc ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SCLY_HUMAN SCLY_HUMAN] Catalyzes the decomposition of L-selenocysteine to L-alanine and elemental selenium (By similarity).
== 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/gz/3gzc_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.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=3gzc ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Selenium and sulfur are two closely related basic elements utilized in nature for a vast array of biochemical reactions. While toxic at higher concentrations, selenium is an essential trace element incorporated into selenoproteins as selenocysteine (Sec), the selenium analogue of cysteine (Cys). Sec lyases (SCLs) and Cys desulfurases (CDs) catalyze the removal of selenium or sulfur from Sec or Cys and generally act on both substrates. In contrast, human SCL (hSCL) is specific for Sec although the only difference between Sec and Cys is the identity of a single atom. The chemical basis of this selenium-over-sulfur discrimination is not understood. Here we describe the X-ray crystal structure of hSCL and identify Asp146 as the key residue that provides the Sec specificity. A D146K variant resulted in loss of Sec specificity and appearance of CD activity. A dynamic active site segment also provides the structural prerequisites for direct product delivery of selenide produced by Sec cleavage, thus avoiding release of reactive selenide species into the cell. We thus here define a molecular determinant for enzymatic specificity discrimination between a single selenium versus sulfur atom, elements with very similar chemical properties. Our findings thus provide molecular insights into a key level of control in human selenium and selenoprotein turnover and metabolism.

Biochemical discrimination between selenium and sulfur 1: a single residue provides selenium specificity to human selenocysteine lyase.,Collins R, Johansson AL, Karlberg T, Markova N, van den Berg S, Olesen K, Hammarstrom M, Flores A, Schuler H, Schiavone LH, Brzezinski P, Arner ES, Hogbom M PLoS One. 2012;7(1):e30581. Epub 2012 Jan 25. PMID:22295093<ref>PMID:22295093</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3gzc" style="background-color:#fffaf0;"></div>

==See Also==
*[[Selenocysteine lyase|Selenocysteine lyase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Arrowsmith C]]
[[Category: Berglund H]]
[[Category: Collins R]]
[[Category: Edwards A]]
[[Category: Ehn M]]
[[Category: Flodin S]]
[[Category: Flores A]]
[[Category: Graslund S]]
[[Category: Hallberg BM]]
[[Category: Hammarstrom M]]
[[Category: Hogbom M]]
[[Category: Holmberg-Schiavone L]]
[[Category: Karlberg T]]
[[Category: Kotenyova T]]
[[Category: Nilsson-Ehle P]]
[[Category: Nordlund P]]
[[Category: Nyman T]]
[[Category: Ogg D]]
[[Category: Persson C]]
[[Category: Sagemark J]]
[[Category: Schuler H]]
[[Category: Stenmark P]]
[[Category: Sundstrom M]]
[[Category: Thorsell AG]]
[[Category: Uppenberg J]]
[[Category: Van Den Berg S]]
[[Category: Weigelt J]]