View source for 6pfz


==Structure of a NAD-Dependent Persulfide Reductase from A. fulgidus==
<StructureSection load='6pfz' size='340' side='right'caption='[[6pfz]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6pfz]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Archaeoglobus_fulgidus_DSM_4304 Archaeoglobus fulgidus DSM 4304]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6PFZ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6PFZ 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]] 3.1000388&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=COA:COENZYME+A'>COA</scene>, <scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</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=6pfz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6pfz OCA], [https://pdbe.org/6pfz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6pfz RCSB], [https://www.ebi.ac.uk/pdbsum/6pfz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6pfz ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/O29847_ARCFU O29847_ARCFU] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
NADH-dependent persulfide reductase (Npsr) has been proposed to facilitate dissimilatory sulfur respiration by reducing persulfide or sulfane sulfur-containing substrates to H2S. The presence of this gene in the sulfate and thiosulfate-reducing Archaeoglobus fulgidus DSM 4304 and other hyperthermophilic Archaeoglobales appears anomalous, as A. fulgidus is unable to respire S(0) and grow in the presence of elemental sulfur. To assess the role of Npsr in the sulfur metabolism of A. fulgidus DSM 4304, the Npsr from A. fulgidus was characterized. AfNpsr is specific for persulfide and polysulfide as substrates in the oxidative half-reaction, exhibiting k cat/K m on the order of 10(4) M(-1) s(-1), which is similar to the kinetic parameters observed for hyperthermophilic CoA persulfide reductases. In contrast to the bacterial Npsr, AfNpsr exhibits low disulfide reductase activity with DTNB; however, similar to the bacterial enzymes, it does not show detectable activity with CoA-disulfide, oxidized glutathione, or cystine. The 3.1 A X-ray structure of AfNpsr reveals access to the tightly bound catalytic CoA, and the active site Cys 42 is restricted by a flexible loop (residues 60-66) that is not seen in the bacterial homologs from Shewanella loihica PV-4 and Bacillus anthracis. Unlike the bacterial enzymes, AfNpsr exhibits NADH oxidase activity and also shows no detectable activity with NADPH. Models suggest steric and electrostatic repulsions of the NADPH 2'-phosphate account for the strong preference for NADH. The presence of Npsr in the nonsulfur-reducing A. fulgidus suggests that the enzyme may offer some protection against S(0) or serve in another metabolic role that has yet to be identified.

Structural and Kinetic Characterization of Hyperthermophilic NADH-Dependent Persulfide Reductase from Archaeoglobus fulgidus.,Shabdar S, Anaclet B, Castineiras AG, Desir N, Choe N, Crane EJ 3rd, Sazinsky MH Archaea. 2021 Mar 9;2021:8817136. doi: 10.1155/2021/8817136. eCollection 2021. PMID:33776585<ref>PMID:33776585</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6pfz" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Archaeoglobus fulgidus DSM 4304]]
[[Category: Large Structures]]
[[Category: Crane III EJ]]
[[Category: Garcia-Constineiras A]]
[[Category: Sazinsky MH]]
[[Category: Shabdar S]]