2BP8

M144Q Structure of nitrite reductase from Alcaligenes xylosoxidans

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.151 

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This is version 1.2 of the entry. See complete history. 


Literature

High Resolution Structural Studies of Mutants Provide Insights Into Catalysis and Electron Transfer Processes in Copper Nitrite Reductase

Hough, M.A., Ellis, M.J., Antonyuk, S., Strange, R.W., Sawers, G., Eady, R.R., Hasnain, S.S.

(2005) J Mol Biol 350: 300

  • DOI: 10.1016/j.jmb.2005.04.006
  • Primary Citation of Related Structures:  
    2BO0, 2BP0, 2BP8

  • PubMed Abstract: 

    • We present high-resolution crystal structures and functional analysis of T1Cu centre mutants of nitrite reductase that perturb the redox potential and the Cys130-His129 "hard-wired" bridge through which electron transfer to the catalytic T2Cu centre ...

    We present high-resolution crystal structures and functional analysis of T1Cu centre mutants of nitrite reductase that perturb the redox potential and the Cys130-His129 "hard-wired" bridge through which electron transfer to the catalytic T2Cu centre occurs. These data provide insight into how activity can be altered through mutational manipulation of the electron delivery centre (T1Cu). The alteration of Cys to Ala results in loss of T1Cu and enzyme inactivation with azurin as electron donor despite the mutant enzyme retaining full nitrite-binding capacity. These data establish unequivocally that no direct transfer of electrons occurs from azurin to the catalytic type 2 Cu centre. The mutation of the axial ligand Met144 to Leu increases both the redox potential and catalytic activity, establishing that the rate-determining step of catalysis is the intermolecular electron transfer from azurin to nitrite reductase.

    Organizational Affiliation: 

    Molecular Biophysics Group, CCLRC Daresbury Laboratory, Warrington WA4 4AD, UK.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DISSIMILATORY COPPER-CONTAINING NITRITE REDUCTASEA336Achromobacter xylosoxidansMutation(s): 1 
Gene Names: nir, nirK, ERS451415_02178
EC: 1.7.2.1
Find proteins for O68601 (Alcaligenes xylosoxydans xylosoxydans)
Explore O68601 
Go to UniProtKB:  O68601
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DISSIMILATORY COPPER-CONTAINING NITRITE REDUCTASEB336Achromobacter xylosoxidansMutation(s): 1 
Gene Names: nir, nirK, ERS451415_02178
EC: 1.7.2.1
Find proteins for O68601 (Alcaligenes xylosoxydans xylosoxydans)
Explore O68601 
Go to UniProtKB:  O68601
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.151 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.6α = 90
b = 90.6β = 90
c = 291.458γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-07-26
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance