3BNF

W. succinogenes NrfA Sulfite Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 

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Literature

Binding and Reduction of Sulfite by Cytochrome c Nitrite Reductase

Lukat, P.Rudolf, M.Stach, P.Messerschmidt, A.Kroneck, P.M.H.Simon, J.Einsle, O.

(2008) Biochemistry 47: 2080-2086

  • DOI: 10.1021/bi7021415
  • Primary Citation of Related Structures:  
    3BNG, 3BNH, 3BNJ, 3BNF

  • PubMed Abstract: 
  • Pentaheme cytochrome c nitrite reductase (ccNiR) catalyzes the six-electron reduction of nitrite to ammonia as the final step in the dissimilatory pathway of nitrate ammonification. It has also been shown to reduce sulfite to sulfide, thus forming the only known link between the biogeochemical cycles of nitrogen and of sulfur ...

    Pentaheme cytochrome c nitrite reductase (ccNiR) catalyzes the six-electron reduction of nitrite to ammonia as the final step in the dissimilatory pathway of nitrate ammonification. It has also been shown to reduce sulfite to sulfide, thus forming the only known link between the biogeochemical cycles of nitrogen and of sulfur. We have found the sulfite reductase activity of ccNiR from Wolinella succinogenes to be significantly smaller than its nitrite reductase activity but still several times higher than the one described for dissimilatory, siroheme-containing sulfite reductases. To compare the sulfite reductase activity of ccNiR with our previous data on nitrite reduction, we determined the binding mode of sulfite to the catalytic heme center of ccNiR from W. succinogenes at a resolution of 1.7 A. Sulfite and nitrite both provide a pair of electrons to form the coordinative bond to the Fe(III) active site of the enzyme, and the oxygen atoms of sulfite are found to interact with the three active site protein residues conserved within the enzyme family. Furthermore, we have characterized the active site variant Y218F of ccNiR that exhibited an almost complete loss of nitrite reductase activity, while sulfite reduction remained unaffected. These data provide a first direct insight into the role of the first sphere of protein ligands at the active site in ccNiR catalysis.


    Organizational Affiliation

    Institut für Mikrobiologie und Genetik, Abteilung Molekulare Strukturbiologie, Georg-August-Universität Göttingen, 37077 Göttingen, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome c-552A485Wolinella succinogenesMutation(s): 0 
EC: 1.7.2.2
UniProt
Find proteins for Q9S1E5 (Wolinella succinogenes (strain ATCC 29543 / DSM 1740 / LMG 7466 / NCTC 11488 / FDC 602W))
Explore Q9S1E5 
Go to UniProtKB:  Q9S1E5
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM (Subject of Investigation/LOI)
Query on HEM

Download Ideal Coordinates CCD File 
I [auth A], J [auth A], K [auth A], L [auth A], M [auth A]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Y1
Query on Y1

Download Ideal Coordinates CCD File 
D [auth A], E [auth A], F [auth A]YTTRIUM ION
Y
KAJPZYFHSCFBCI-UHFFFAOYSA-N
 Ligand Interaction
SO3
Query on SO3

Download Ideal Coordinates CCD File 
C [auth A]SULFITE ION
O3 S
LSNNMFCWUKXFEE-UHFFFAOYSA-L
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
G [auth A], H [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
B [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 119.5α = 90
b = 119.5β = 90
c = 186.674γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MAR345dtbdata collection
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

  • Deposited Date: 2007-12-14 
  • Released Date: 2008-02-26 
  • Deposition Author(s): Lukat, P., Einsle, O.

Revision History  (Full details and data files)

  • Version 1.0: 2008-02-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance