2pp8: Difference between revisions

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[[Image:2pp8.jpg|left|200px]]


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==Formate bound to oxidized wild type AfNiR==
The line below this paragraph, containing "STRUCTURE_2pp8", creates the "Structure Box" on the page.
<StructureSection load='2pp8' size='340' side='right'caption='[[2pp8]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)  
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[2pp8]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Alcaligenes_faecalis Alcaligenes faecalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PP8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2PP8 FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.5&#8491;</td></tr>
-->
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=CU1:COPPER+(I)+ION'>CU1</scene>, <scene name='pdbligand=FMT:FORMIC+ACID'>FMT</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</scene></td></tr>
{{STRUCTURE_2pp8| PDB=2pp8 |  SCENE= }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2pp8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2pp8 OCA], [https://pdbe.org/2pp8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2pp8 RCSB], [https://www.ebi.ac.uk/pdbsum/2pp8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2pp8 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/NIR_ALCFA NIR_ALCFA]
== 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/pp/2pp8_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=2pp8 ConSurf].
<div style="clear:both"></div>


'''Formate bound to oxidized wild type AfNiR'''
==See Also==
 
*[[Nitrite reductase 3D structures|Nitrite reductase 3D structures]]
 
__TOC__
==Overview==
</StructureSection>
The interaction of copper-containing dissimilatory nitrite reductase from Alcaligenes faecalis S-6 ( AfNiR) with each of five small molecules was studied using crystallography and steady-state kinetics. Structural studies revealed that each small molecule interacted with the oxidized catalytic type 2 copper of AfNiR. Three small molecules (formate, acetate and nitrate) mimic the substrate by having at least two oxygen atoms for bidentate coordination to the type 2 copper atom. These three anions bound to the copper ion in the same asymmetric, bidentate manner as nitrite. Consistent with their weak inhibition of the enzyme ( K i &gt;50 mM), the Cu-O distances in these AfNiR-inhibitor complexes were approximately 0.15 A longer than that observed in the AfNiR-nitrite complex. The binding mode of each inhibitor is determined in part by steric interactions with the side chain of active site residue Ile257. Moreover, the side chain of Asp98, a conserved residue that hydrogen bonds to type 2 copper-bound nitrite and nitric oxide, was either disordered or pointed away from the inhibitors. Acetate and formate inhibited AfNiR in a mixed fashion, consistent with the occurrence of second acetate binding site in the AfNiR-acetate complex that occludes access to the type 2 copper. A fourth small molecule, nitrous oxide, bound to the oxidized metal in a side-on fashion reminiscent of nitric oxide to the reduced copper. Nevertheless, nitrous oxide bound at a farther distance from the metal. The fifth small molecule, azide, inhibited the reduction of nitrite by AfNiR most strongly ( K ic = 2.0 +/- 0.1 mM). This ligand bound to the type 2 copper center end-on with a Cu-N c distance of approximately 2 A, and was the only inhibitor to form a hydrogen bond with Asp98. Overall, the data substantiate the roles of Asp98 and Ile257 in discriminating substrate from other small anions.
 
==About this Structure==
2PP8 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Alcaligenes_faecalis Alcaligenes faecalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PP8 OCA].
 
==Reference==
Conserved Active Site Residues Limit Inhibition of a Copper-Containing Nitrite Reductase by Small Molecules., Tocheva EI, Eltis LD, Murphy ME, Biochemistry. 2008 Mar 22;. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/18358002 18358002]
[[Category: Alcaligenes faecalis]]
[[Category: Alcaligenes faecalis]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Eltis, L D.]]
[[Category: Eltis LD]]
[[Category: Murphy, M E.P.]]
[[Category: Murphy MEP]]
[[Category: Tocheva, E I.]]
[[Category: Tocheva EI]]
[[Category: Bacteria]]
[[Category: Copper]]
[[Category: Denitrification]]
[[Category: Nitrite reductase]]
[[Category: Oxidoreductase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Apr 24 09:26:50 2008''
Retrieved from "https://proteopedia.org/2pp8"