2BIH

crystal structure of the Molybdenum-containing nitrate reducing fragment of Pichia angusta assimilatory nitrate reductase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Basis of Eukaryotic Nitrate Reduction: Crystal Structures of the Nitrate Reductase Active Site

Fischer, K.Barbier, G.Hecht, H.-J.Mendel, R.R.Campbell, W.H.Schwarz, G.

(2005) Plant Cell 17: 1167

  • DOI: 10.1105/tpc.104.029694
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • 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 ce ...

    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.


    Organizational Affiliation

    Institute of Plant Biology, Technical University Braunschweig, D-38106 Braunschweig, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NITRATE REDUCTASE [NADPH]
A
474Pichia angustaMutation(s): 0 
Gene Names: YNR1
EC: 1.7.1.3
Find proteins for P49050 (Pichia angusta)
Go to UniProtKB:  P49050
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MTV
Query on MTV

Download SDF File 
Download CCD File 
A
(MOLYBDOPTERIN-S,S)-DIOXO-THIO-MOLYBDENUM(IV)
C10 H9 Mo N5 O8 P S2
LHAIYTXZRHTNKS-NRYJBHHQSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.190 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 76.740α = 90.00
b = 76.740β = 90.00
c = 306.086γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-03-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance