Ferredoxin-NADP Reductase Mutant with SER 80 Replaced by ALA (S80A)

Experimental Data Snapshot

  • Resolution: 1.89 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 

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A Hydrogen Bond Network in the Active Site of Anabaena Ferredoxin-Nadp(+) Reductase Modulates its Catalytic Efficiency.

Sanchez-Azqueta, A.Herguedas, B.Hurtado-Guerrero, R.Hervas, M.Navarro, J.A.Martinez-Julvez, M.Medina, M.

(2013) Biochim Biophys Acta 1837: 251

  • DOI: https://doi.org/10.1016/j.bbabio.2013.10.010
  • Primary Citation of Related Structures:  
    3ZBT, 3ZBU, 3ZC3, 4BPR

  • PubMed Abstract: 

    Ferredoxin-nicotinamide-adenine dinucleotide phosphate (NADP(+)) reductase (FNR) catalyses the production of reduced nicotinamide-adenine dinucleotide phosphate (NADPH) in photosynthetic organisms, where its flavin adenine dinucleotide (FAD) cofactor takes two electrons from two reduced ferredoxin (Fd) molecules in two sequential steps, and transfers them to NADP(+) in a single hydride transfer (HT) step. Despite the good knowledge of this catalytic machinery, additional roles can still be envisaged for already reported key residues, and new features are added to residues not previously identified as having a particular role in the mechanism. Here, we analyse for the first time the role of Ser59 in Anabaena FNR, a residue suggested by recent theoretical simulations as putatively involved in competent binding of the coenzyme in the active site by cooperating with Ser80. We show that Ser59 indirectly modulates the geometry of the active site, the interaction with substrates and the electronic properties of the isoalloxazine ring, and in consequence the electron transfer (ET) and HT processes. Additionally, we revise the role of Tyr79 and Ser80, previously investigated in homologous enzymes from plants. Our results probe that the active site of FNR is tuned by a H-bond network that involves the side-chains of these residues and that results to critical optimal substrate binding, exchange of electrons and, particularly, competent disposition of the C4n (hydride acceptor/donor) of the nicotinamide moiety of the coenzyme during the reversible HT event.

  • Organizational Affiliation

    Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain; Institute of Biocomputation and Physics of Complex Systems (BIFI)-Joint Unit BIFI-IQFR (CSIC), Universidad de Zaragoza, Zaragoza, Spain.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FERREDOXIN-NADP REDUCTASE303Nostoc sp. PCC 7119Mutation(s): 1 
Find proteins for P21890 (Nostoc sp. (strain ATCC 29151 / PCC 7119))
Explore P21890 
Go to UniProtKB:  P21890
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21890
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.89 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.985α = 90
b = 86.985β = 90
c = 96.322γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata 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: 2013-11-20
    Type: Initial release
  • Version 1.1: 2014-01-08
    Changes: Database references
  • Version 1.2: 2018-05-30
    Changes: Data collection, Structure summary
  • Version 1.3: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description