Crystal structure of the H286L mutant of Ferredoxin-NADP+ reductase from Plasmodium falciparum

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.230 

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Plasmodium falciparum ferredoxin-NADP+ reductase His286 plays a dual role in NADP(H) binding and catalysis

Crobu, D.Canevari, G.Milani, M.Pandini, V.Vanoni, M.A.Bolognesi, M.Zanetti, G.Aliverti, A.

(2009) Biochemistry 48: 9525-9533

  • DOI: https://doi.org/10.1021/bi9013209
  • Primary Citation of Related Structures:  
    3JQP, 3JQQ, 3JQR

  • PubMed Abstract: 

    The NADP-binding site of Plasmodium falciparum ferredoxin-NADP(+) reductase contains two basic residues, His286 and Lys249, conserved within the Plasmodium genus, but not in other plant-type homologues. Previous crystal studies indicated that His286 interacts with the adenine ring and with the 5'-phosphate of 2'-P-AMP, a ligand that mimics the adenylate moiety of NADP(H). Here we show that replacement of His286 with aliphatic residues results both in a decrease in the affinity of the enzyme for NADPH and in a decrease in k(cat), due to a lowered hydride-transfer rate. Unexpectedly, the mutation to Gln produces an enzyme more active than the wild-type one, whereas the change to Lys destabilizes the nicotinamide-isoalloxazine interaction, decreasing k(cat). On the basis of the crystal structure of selected mutants complexed with 2'-P-AMP, we conclude that the His286 side chain plays a dual role in catalysis both by providing binding energy for NADPH and by favoring the catalytically competent orientation of its nicotinamide ring. For the latter function, the H-bonding potential rather than the positively charged state of the His286 imidazole seems sufficient. Furthermore, we show that the Lys249Ala mutation decreases K(m)(NADPH) and K(d) for NADP(+) or 2'-P-AMP by a factor of 10. We propose that the Lys249 side chain participates in substrate recognition by interacting with the 2'-phosphate of NADP(H) and that this interaction was not observed in the crystal form of the enzyme-2'-P-AMP complex due to a conformational perturbation of the substrate-binding loop induced by dimerization.

  • Organizational Affiliation

    Dipartimento di Scienze Biomolecolari e Biotecnologie, Universita degli Studi di Milano, via Celoria 26, 20133 Milano, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ferredoxin NADP reductase316Plasmodium falciparumMutation(s): 1 
Gene Names: PfFNRPFF1115w
Find proteins for C6KT68 (Plasmodium falciparum (isolate 3D7))
Explore C6KT68 
Go to UniProtKB:  C6KT68
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupC6KT68
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on FAD

Download Ideal Coordinates CCD File 
C27 H33 N9 O15 P2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.230 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.109α = 90
b = 96.689β = 118
c = 46.85γ = 90
Software Package:
Software NamePurpose
DNAdata collection
MOSFLMdata reduction
SCALAdata 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: 2010-01-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.3: 2023-11-01
    Changes: Data collection, Refinement description