1cnf: Difference between revisions

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New page: left|200px<br /><applet load="1cnf" size="450" color="white" frame="true" align="right" spinBox="true" caption="1cnf, resolution 2.7Å" /> '''STRUCTURAL STUDIES ON...
 
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[[Image:1cnf.jpg|left|200px]]<br /><applet load="1cnf" size="450" color="white" frame="true" align="right" spinBox="true"
caption="1cnf, resolution 2.7&Aring;" />
'''STRUCTURAL STUDIES ON CORN NITRATE REDUCTASE: REFINED STRUCTURE OF THE CYTOCHROME B REDUCTASE FRAGMENT AT 2.5 ANGSTROMS, ITS ADP COMPLEX AND AN ACTIVE SITE MUTANT AND MODELING OF THE CYTOCHROME B DOMAIN'''<br />


==Overview==
==STRUCTURAL STUDIES ON CORN NITRATE REDUCTASE: REFINED STRUCTURE OF THE CYTOCHROME B REDUCTASE FRAGMENT AT 2.5 ANGSTROMS, ITS ADP COMPLEX AND AN ACTIVE SITE MUTANT AND MODELING OF THE CYTOCHROME B DOMAIN==
The refined crystal structures of the recombinant cytochrome b reductase, fragment of corn (Zea mays) nitrate reductase, its ADP complex and the, active-site mutant Cys242Ser are reported here. The native structure has, been refined at 2.5 A resolution to a crystallographic R-factor of 18.7%, with root-mean-square (r.m.s) deviations from standard bond lengths and, angles of 0.013 A and 2.0 degrees. The diffraction pattern of the crystals, is highly anisotropic and correction of this effect lowered the, crystallographic R-factor by 5% during the refinement. The structure of, the enzyme co-crystallized with ADP has been solved at 2.7 A resolution, and refined to an R-factor of 18.6% with r.m.s. deviations from standard, bond lengths and angles of 0.014 A and 2.1 degrees. It revealed the, binding site of the ADP moiety of the NADH cofactor, which is the electron, donor for nitrate reduction. Based on this structure, a model of NADH at, the active site of the enzyme was built and the implications for electron, transfer from NADH to the flavin cofactor are discussed. The crystal, structure of an active-site mutant enzyme, Cys242Ser, has been solved by, difference Fourier synthesis and refined to an R-factor of 19.0% to 3.0 A, resolution with standard deviations of bond lengths and angles of 0.017 A, and 2.5 degrees. This structure analysis suggests that the observed, decrease in catalytic activity of this mutant might be due to misalignment, of the nicotinamide ring in its binding site. A model of the, heme-containing domain of nitrate reductase has been built based on the, X-ray structure of bovine cytochrome b5 and has been docked with the, cytochrome b reductase fragment of nitrate reductase. The model of the, complex contains six salt-bridges at the domain-domain interface and a, hydrophobic core. In this model, His48, an invariant residue in the, cytochrome b reductase family, forms an interaction with the propionic, acid group of the D-ring of the heme cofactor. This group is in contact, with the C-8 methyl group of the flavin ring. Residues that might, influence the redox potential of the flavin cofactor are proposed and, their possible role in electron transfer is discussed.
<StructureSection load='1cnf' size='340' side='right'caption='[[1cnf]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1cnf]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Zea_mays Zea mays]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CNF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CNF 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]] 2.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</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=1cnf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cnf OCA], [https://pdbe.org/1cnf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cnf RCSB], [https://www.ebi.ac.uk/pdbsum/1cnf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cnf ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/NIA1_MAIZE NIA1_MAIZE] 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/cn/1cnf_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=1cnf ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1CNF is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Zea_mays Zea mays] with FAD and ADP as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Nitrate_reductase_(NADH) Nitrate reductase (NADH)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.7.1.1 1.7.1.1] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1CNF OCA].
*[[Nitrate reductase|Nitrate reductase]]
 
__TOC__
==Reference==
</StructureSection>
Structural studies on corn nitrate reductase: refined structure of the cytochrome b reductase fragment at 2.5 A, its ADP complex and an active-site mutant and modeling of the cytochrome b domain., Lu G, Lindqvist Y, Schneider G, Dwivedi U, Campbell W, J Mol Biol. 1995 May 19;248(5):931-48. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=7760334 7760334]
[[Category: Large Structures]]
[[Category: Nitrate reductase (NADH)]]
[[Category: Single protein]]
[[Category: Zea mays]]
[[Category: Zea mays]]
[[Category: Lindqvist, Y.]]
[[Category: Lindqvist Y]]
[[Category: Lu, G.]]
[[Category: Lu G]]
[[Category: Schneider, G.]]
[[Category: Schneider G]]
[[Category: ADP]]
[[Category: FAD]]
[[Category: oxidoreductase (nitrogenous acceptor)]]
 
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 12:36:00 2007''

Latest revision as of 09:44, 7 February 2024

STRUCTURAL STUDIES ON CORN NITRATE REDUCTASE: REFINED STRUCTURE OF THE CYTOCHROME B REDUCTASE FRAGMENT AT 2.5 ANGSTROMS, ITS ADP COMPLEX AND AN ACTIVE SITE MUTANT AND MODELING OF THE CYTOCHROME B DOMAINSTRUCTURAL STUDIES ON CORN NITRATE REDUCTASE: REFINED STRUCTURE OF THE CYTOCHROME B REDUCTASE FRAGMENT AT 2.5 ANGSTROMS, ITS ADP COMPLEX AND AN ACTIVE SITE MUTANT AND MODELING OF THE CYTOCHROME B DOMAIN

Structural highlights

1cnf is a 1 chain structure with sequence from Zea mays. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.7Å
Ligands:,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

NIA1_MAIZE 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.

See Also

1cnf, resolution 2.70Å

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