View source for 3ml1


==Crystal Structure of the Periplasmic Nitrate Reductase from Cupriavidus necator==
<StructureSection load='3ml1' size='340' side='right'caption='[[3ml1]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3ml1]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Alcaligenes_eutropha_h16 Alcaligenes eutropha h16]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3ML1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3ML1 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEC:HEME+C'>HEC</scene>, <scene name='pdbligand=MGD:2-AMINO-5,6-DIMERCAPTO-7-METHYL-3,7,8A,9-TETRAHYDRO-8-OXA-1,3,9,10-TETRAAZA-ANTHRACEN-4-ONE+GUANOSINE+DINUCLEOTIDE'>MGD</scene>, <scene name='pdbligand=MOS:DIOXOTHIOMOLYBDENUM(VI)+ION'>MOS</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3o5a|3o5a]]</div></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">napAB ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=381666 Alcaligenes eutropha H16]), napB ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=381666 Alcaligenes eutropha H16])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Nitrate_reductase Nitrate reductase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.7.99.4 1.7.99.4] </span></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=3ml1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ml1 OCA], [https://pdbe.org/3ml1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3ml1 RCSB], [https://www.ebi.ac.uk/pdbsum/3ml1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3ml1 ProSAT]</span></td></tr>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/NAPA_CUPNH NAPA_CUPNH]] Catalytic subunit of the periplasmic nitrate reductase (NAP). Only expressed at high levels during aerobic growth. NapAB complex receives electrons from the membrane-anchored tetraheme protein NapC, thus allowing electron flow between membrane and periplasm. Essential function for nitrate assimilation and may have a role in anaerobic metabolism. [[https://www.uniprot.org/uniprot/NAPB_CUPNH NAPB_CUPNH]] Electron transfer subunit of the periplasmic nitrate reductase complex NapAB. Receives electrons from the membrane-anchored tetraheme c-type NapC protein and transfers these to NapA subunit, thus allowing electron flow between membrane and periplasm. Essential for periplasmic nitrate reduction with nitrate as the terminal electron acceptor.<ref>PMID:8376334</ref>  
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== Publication Abstract from PubMed ==
The periplasmic nitrate reductase (NapAB) from Cupriavidus necator is a heterodimeric protein that belongs to the dimethyl sulfoxide reductase family of mononuclear Mo-containing enzymes and catalyzes the reduction of nitrate to nitrite. The protein comprises a large catalytic subunit (NapA, 91 kDa) containing the molybdenum active site plus one [4Fe-4S] cluster, as well as a small subunit (NapB, 17 kDa), which is a diheme c-type cytochrome involved in electron transfer. Crystals of the oxidized form of the enzyme diffracted beyond 1.5 A at the European Synchrotron Radiation Facility. This is the highest resolution reported to date for a nitrate reductase, providing true atomic details of the protein active center, and this showed further evidence on the molybdenum coordination sphere, corroborating previous data on the related Desulfovibrio desulfuricans NapA. The molybdenum atom is bound to a total of six sulfur atoms, with no oxygen ligands or water molecules in the vicinity. In the present work, we were also able to prepare partially reduced crystals that revealed two alternate conformations of the Mo-coordinating cysteine. This crystal form was obtained by soaking dithionite into crystals grown in the presence of the ionic liquid [C(4)mim]Cl(-). In addition, UV-Vis and EPR spectroscopy studies showed that the periplasmic nitrate reductase from C. necator might work at unexpectedly high redox potentials when compared to all periplasmic nitrate reductases studied to date.

The Crystal Structure of Cupriavidus necator Nitrate Reductase in Oxidized and Partially Reduced States.,Coelho C, Gonzalez PJ, Moura JJ, Moura I, Trincao J, Joao Romao M J Mol Biol. 2011 Mar 23. PMID:21419779<ref>PMID:21419779</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3ml1" style="background-color:#fffaf0;"></div>

==See Also==
*[[Cytochrome C 3D structures|Cytochrome C 3D structures]]
*[[Nitrate reductase|Nitrate reductase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Alcaligenes eutropha h16]]
[[Category: Large Structures]]
[[Category: Nitrate reductase]]
[[Category: Coelho, C]]
[[Category: Romao, M J]]
[[Category: Trincao, J]]
[[Category: Heterodimer]]
[[Category: Oxidoreductase]]