Ferredoxin:nadp+ oxidoreductase (ferredoxin reductase) mutant e312l

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 

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Probing the function of the invariant glutamyl residue 312 in spinach ferredoxin-NADP+ reductase.

Aliverti, A.Deng, Z.Ravasi, D.Piubelli, L.Karplus, P.A.Zanetti, G.

(1998) J Biol Chem 273: 34008-34015

  • DOI: https://doi.org/10.1074/jbc.273.51.34008
  • Primary Citation of Related Structures:  
    1BX0, 1BX1, 1FRQ

  • PubMed Abstract: 

    Ferredoxin-NADP+ reductase, the prototype of a large family of structurally related flavoenzymes, pairs single electrons carried by ferredoxin I and transfers them as a hydride to NADP+. Four mutants of the enzyme, in which Glu-312 was replaced with Asp, Gln, Leu, and Ala to probe the role of the residue charge, size, and polarity in the enzyme activity, have been heterologously expressed, purified, and characterized through steady-state, rapid kinetic studies, ligand-binding experiments, and three-dimensional structure determination by x-ray crystallography. The E312L mutant was the only one that was almost inactive (approximately 1%), whereas unexpectedly the E312A reductase was 10-100% active with the various acceptors tested. Rapid kinetic absorption spectroscopy studies demonstrated that flavin reduction by NADPH was impaired in the mutants. Furthermore, NADP(H) binding was partially perturbed. These functional and structural studies lead us to conclude that Glu-312 does not fulfil the role of proton donor during catalysis, but it is required for proper binding of the nicotinamide ring of NADP(H). In addition, its charge modulates the two one-electron redox potentials of the flavin to stabilize the semiquinone form.

  • Organizational Affiliation

    Dipartimento di Fisiologia e Biochimica Generali, Università degli Studi di Milano, Via Celoria 26, I-20133 Milano, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN (FERREDOXIN:NADP+ OXIDOREDUCTASE)314Spinacia oleraceaMutation(s): 1 
Find proteins for P00455 (Spinacia oleracea)
Explore P00455 
Go to UniProtKB:  P00455
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00455
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.2α = 90
b = 58β = 99.9
c = 68.2γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
X-PLORmodel building

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-10-14
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-03-14
    Changes: Database references
  • Version 1.4: 2023-08-09
    Changes: Data collection, Database references, Derived calculations, Refinement description