View source for 7kq3


==Structure of isethionate sulfite-lyase from Bilophila wadsworthia with substrate isethionate bound==
<StructureSection load='7kq3' size='340' side='right'caption='[[7kq3]], [[Resolution|resolution]] 2.69&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7kq3]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Bilophila_wadsworthia_3_1_6 Bilophila wadsworthia 3_1_6]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7KQ3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7KQ3 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]] 2.688&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=8X3:2-hydroxyethylsulfonic+acid'>8X3</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=7kq3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7kq3 OCA], [https://pdbe.org/7kq3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7kq3 RCSB], [https://www.ebi.ac.uk/pdbsum/7kq3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7kq3 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ISLA_BILW3 ISLA_BILW3] Involved in an anaerobic respiration pathway that converts the sulfonate taurine (2-aminoethanesulfonate) to ammonia, acetate and sulfide. Catalyzes the radical-mediated C-S bond cleavage of isethionate (2-hydroxyethanesulfonate) to form sulfite and acetaldehyde. Is not able to use any alternate organosulfonate or (S)-1,2-propanediol or choline as a substrate, showing that this enzyme is highly specific for isethionate.<ref>PMID:30718429</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Desulfonation of isethionate by the bacterial glycyl radical enzyme (GRE) isethionate sulfite-lyase (IslA) generates sulfite, a substrate for respiration that in turn produces the disease-associated metabolite hydrogen sulfide. Here, we present a 2.7 A resolution X-ray structure of wild-type IslA from Bilophila wadsworthia with isethionate bound. In comparison with other GREs, alternate positioning of the active site beta strands allows for distinct residue positions to contribute to substrate binding. These structural differences, combined with sequence variations, create a highly tailored active site for the binding of the negatively charged isethionate substrate. Through the kinetic analysis of 14 IslA variants and computational analyses, we probe the mechanism by which radical chemistry is used for C-S bond cleavage. This work further elucidates the structural basis of chemistry within the GRE superfamily and will inform structure-based inhibitor design of IsIA and thus of microbial hydrogen sulfide production.

Molecular basis of C-S bond cleavage in the glycyl radical enzyme isethionate sulfite-lyase.,Dawson CD, Irwin SM, Backman LRF, Le C, Wang JX, Vennelakanti V, Yang Z, Kulik HJ, Drennan CL, Balskus EP Cell Chem Biol. 2021 Mar 19. pii: S2451-9456(21)00110-0. doi:, 10.1016/j.chembiol.2021.03.001. PMID:33773110<ref>PMID:33773110</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7kq3" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bilophila wadsworthia 3_1_6]]
[[Category: Large Structures]]
[[Category: Backman LRF]]
[[Category: Dawson CD]]
[[Category: Drennan CL]]