3MKH

Podospora anserina Nitroalkane Oxidase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Identification of a hypothetical protein from Podospora anserina as a nitroalkane oxidase.

Tormos, J.R.Taylor, A.B.Daubner, S.C.Hart, P.J.Fitzpatrick, P.F.

(2010) Biochemistry 49: 5035-5041

  • DOI: https://doi.org/10.1021/bi100610e
  • Primary Citation of Related Structures:  
    3MKH

  • PubMed Abstract: 

    The flavoprotein nitroalkane oxidase (NAO) from Fusarium oxysporum catalyzes the oxidation of primary and secondary nitroalkanes to their respective aldehydes and ketones. Structurally, the enzyme is a member of the acyl-CoA dehydrogenase superfamily. To date no enzymes other than that from F. oxysporum have been annotated as NAOs. To identify additional potential NAOs, the available database was searched for enzymes in which the active site residues Asp402, Arg409, and Ser276 were conserved. Of the several fungal enzymes identified in this fashion, PODANSg2158 from Podospora anserina was selected for expression and characterization. The recombinant enzyme is a flavoprotein with activity on nitroalkanes comparable to the F. oxysporum NAO, although the substrate specificity is somewhat different. Asp399, Arg406, and Ser273 in PODANSg2158 correspond to the active site triad in F. oxysporum NAO. The k(cat)/K(M)-pH profile with nitroethane shows a pK(a) of 5.9 that is assigned to Asp399 as the active site base. Mutation of Asp399 to asparagine decreases the k(cat)/K(M) value for nitroethane over 2 orders of magnitude. The R406K and S373A mutations decrease this kinetic parameter by 64- and 3-fold, respectively. The structure of PODANSg2158 has been determined at a resolution of 2.0 A, confirming its identification as an NAO.


  • Organizational Affiliation

    Department of Biochemistry, University of Texas Health Science Center, San Antonio, Texas 78229, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NITROALKANE OXIDASE
A, B, C, D
438Podospora anserinaMutation(s): 0 
EC: 1.7.3.1
UniProt
Find proteins for B2AM55 (Podospora anserina (strain S / ATCC MYA-4624 / DSM 980 / FGSC 10383))
Explore B2AM55 
Go to UniProtKB:  B2AM55
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB2AM55
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B],
J [auth C],
L [auth D]
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
G [auth A],
I [auth B]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
MG
Query on MG

Download Ideal Coordinates CCD File 
F [auth A],
K [auth C]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 137.501α = 90
b = 137.501β = 90
c = 131.323γ = 90
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-06-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2018-01-24
    Changes: Structure summary
  • Version 1.3: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description