2BP8

M144Q Structure of nitrite reductase from Alcaligenes xylosoxidans

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.149 

wwPDB Validation 3D Report Full Report


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:  

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DISSIMILATORY COPPER-CONTAINING NITRITE REDUCTASE
A
336Alcaligenes xylosoxydans xylosoxydansMutation(s): 1 
Gene Names: nir (nirK)
EC: 1.7.2.1
Find proteins for O68601 (Alcaligenes xylosoxydans xylosoxydans)
Go to UniProtKB:  O68601
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DISSIMILATORY COPPER-CONTAINING NITRITE REDUCTASE
B
336Alcaligenes xylosoxydans xylosoxydansMutation(s): 1 
Gene Names: nir (nirK)
EC: 1.7.2.1
Find proteins for O68601 (Alcaligenes xylosoxydans xylosoxydans)
Go to UniProtKB:  O68601
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4
Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CU
Query on CU
Download SDF File 
Download CCD File 
A, B
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.149 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 90.600α = 90.00
b = 90.600β = 90.00
c = 291.458γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
HKL-2000data reduction
REFMACrefinement
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
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance