View source for 4piy


==Homocysteine bound Cysteine Dioxygenase C93A variant at pH 6.2==
<StructureSection load='4piy' size='340' side='right' caption='[[4piy]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4piy]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4PIY OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4PIY FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=HCS:2-AMINO-4-MERCAPTO-BUTYRIC+ACID'>HCS</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4ieo|4ieo]], [[4iep|4iep]], [[4ieq|4ieq]], [[4ier|4ier]], [[4ies|4ies]], [[4iet|4iet]], [[4ieu|4ieu]], [[4iev|4iev]], [[4iew|4iew]], [[4iex|4iex]], [[4iey|4iey]], [[4iez|4iez]], [[4jtn|4jtn]], [[4jto|4jto]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Cysteine_dioxygenase Cysteine dioxygenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.13.11.20 1.13.11.20] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4piy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4piy OCA], [http://pdbe.org/4piy PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4piy RCSB], [http://www.ebi.ac.uk/pdbsum/4piy PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4piy ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In mammals, the non-heme iron enzyme cysteine dioxygenase (CDO) helps regulate Cys levels through converting Cys to Cys sulfinic acid. Its activity is in part modulated by the formation of a Cys93-Tyr157 crosslink that increases its catalytic efficiency over 10-fold. Here, 21 high-resolution mammalian CDO structures are used to gain insight into how the Cys-Tyr crosslink promotes activity and how select competitive inhibitors bind. Crystal structures of crosslink-deficient C93A and Y157F variants reveal similar ~1.0-A shifts in the side chain of residue 157, and both variant structures have a new chloride ion coordinating the active site iron. Cys binding is also different from wild-type CDO, and no Cys-persulfenate forms in the C93A or Y157F active sites at pH6.2 or 8.0. We conclude that the crosslink enhances activity by positioning the Tyr157 hydroxyl to enable proper Cys binding, proper oxygen binding, and optimal chemistry. In addition, structures are presented for homocysteine (Hcy), D-Cys, thiosulfate, and azide bound as competitive inhibitors. The observed binding modes of Hcy and D-Cys clarify why they are not substrates, and the binding of azide shows that in contrast to what has been proposed, it does not bind in these crystals as a superoxide mimic.

Structure-Based Insights into the Role of the Cys-Tyr Crosslink and Inhibitor Recognition by Mammalian Cysteine Dioxygenase.,Driggers CM, Kean KM, Hirschberger LL, Cooley RB, Stipanuk MH, Karplus PA J Mol Biol. 2016 Oct 9;428(20):3999-4012. doi: 10.1016/j.jmb.2016.07.012. Epub, 2016 Jul 29. PMID:27477048<ref>PMID:27477048</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4piy" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Cysteine dioxygenase]]
[[Category: Driggers, C M]]
[[Category: Karplus, P A]]
[[Category: C93-y157 crosslink]]
[[Category: Catalyzes oxidation]]
[[Category: Cupin fold]]
[[Category: Cysteine to cysteine sulfinate]]
[[Category: Cytosol]]
[[Category: Oxidoreductase]]