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== | ==crystal structure of nitrate-reducing fragment of assimilatory nitrate reductase from Pichia angusta== | ||
Nitrate assimilation in autotrophs provides most of the reduced nitrogen | <StructureSection load='2bii' size='340' side='right'caption='[[2bii]], [[Resolution|resolution]] 1.70Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2bii]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Ogataea_angusta Ogataea angusta]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BII OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2BII 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]] 1.7Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MTV:(MOLYBDOPTERIN-S,S)-DIOXO-THIO-MOLYBDENUM(IV)'>MTV</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=2bii FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2bii OCA], [https://pdbe.org/2bii PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2bii RCSB], [https://www.ebi.ac.uk/pdbsum/2bii PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2bii ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/NIA_PICAN NIA_PICAN] Nitrate reductase is a key enzyme involved in the first step of nitrate assimilation in plants, fungi and bacteria. | |||
== 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/bi/2bii_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=2bii ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Nitrate assimilation in autotrophs provides most of the reduced nitrogen on earth. In eukaryotes, reduction of nitrate to nitrite is catalyzed by the molybdenum-containing NAD(P)H:nitrate reductase (NR; EC 1.7.1.1-3). In addition to the molybdenum center, NR contains iron-heme and flavin adenine dinucleotide as redox cofactors involved in an internal electron transport chain from NAD(P)H to nitrate. Recombinant, catalytically active Pichia angusta nitrate-reducing, molybdenum-containing fragment (NR-Mo) was expressed in P. pastoris and purified. Crystal structures for NR-Mo were determined at 1.7 and 2.6 angstroms. These structures revealed a unique slot for binding nitrate in the active site and identified key Arg and Trp residues potentially involved in nitrate binding. Dimeric NR-Mo is similar in overall structure to sulfite oxidases, with significant differences in the active site. Sulfate bound in the active site caused conformational changes, as compared with the unbound enzyme. Four ordered water molecules located in close proximity to Mo define a nitrate binding site, a penta-coordinated reaction intermediate, and product release. Because yeast NAD(P)H:NR is representative of the family of eukaryotic NR, we propose a general mechanism for nitrate reduction catalysis. | |||
Structural basis of eukaryotic nitrate reduction: crystal structures of the nitrate reductase active site.,Fischer K, Barbier GG, Hecht HJ, Mendel RR, Campbell WH, Schwarz G Plant Cell. 2005 Apr;17(4):1167-79. Epub 2005 Mar 16. PMID:15772287<ref>PMID:15772287</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2bii" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Nitrate reductase|Nitrate reductase]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Ogataea angusta]] | |||
[[Category: Barbier G]] | |||
[[Category: Campbell WH]] | |||
[[Category: Fischer K]] | |||
[[Category: Hecht H-J]] | |||
[[Category: Mendel RR]] | |||
[[Category: Schwarz G]] | |||
Latest revision as of 16:39, 13 December 2023
crystal structure of nitrate-reducing fragment of assimilatory nitrate reductase from Pichia angustacrystal structure of nitrate-reducing fragment of assimilatory nitrate reductase from Pichia angusta
Structural highlights
FunctionNIA_PICAN Nitrate reductase is a key enzyme involved in the first step of nitrate assimilation in plants, fungi and bacteria. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedNitrate assimilation in autotrophs provides most of the reduced nitrogen on earth. In eukaryotes, reduction of nitrate to nitrite is catalyzed by the molybdenum-containing NAD(P)H:nitrate reductase (NR; EC 1.7.1.1-3). In addition to the molybdenum center, NR contains iron-heme and flavin adenine dinucleotide as redox cofactors involved in an internal electron transport chain from NAD(P)H to nitrate. Recombinant, catalytically active Pichia angusta nitrate-reducing, molybdenum-containing fragment (NR-Mo) was expressed in P. pastoris and purified. Crystal structures for NR-Mo were determined at 1.7 and 2.6 angstroms. These structures revealed a unique slot for binding nitrate in the active site and identified key Arg and Trp residues potentially involved in nitrate binding. Dimeric NR-Mo is similar in overall structure to sulfite oxidases, with significant differences in the active site. Sulfate bound in the active site caused conformational changes, as compared with the unbound enzyme. Four ordered water molecules located in close proximity to Mo define a nitrate binding site, a penta-coordinated reaction intermediate, and product release. Because yeast NAD(P)H:NR is representative of the family of eukaryotic NR, we propose a general mechanism for nitrate reduction catalysis. Structural basis of eukaryotic nitrate reduction: crystal structures of the nitrate reductase active site.,Fischer K, Barbier GG, Hecht HJ, Mendel RR, Campbell WH, Schwarz G Plant Cell. 2005 Apr;17(4):1167-79. Epub 2005 Mar 16. PMID:15772287[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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