Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.225 

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C-Terminal Tyrosine of Ferredoxin-Nadp(+) Reductase in Hydride Transfer Processes with Nad(P)(+)/H.

Tejero, J.Perez-Dorado, I.Maya, C.Julvez, M.M.Sanz-Aparicio, J.Gomez-Moreno, C.Hermoso, J.A.Medina, M.

(2005) Biochemistry 44: 13477

  • DOI: https://doi.org/10.1021/bi051278c
  • Primary Citation of Related Structures:  
    1W34, 1W35, 1W87, 2BSA

  • PubMed Abstract: 

    Ferredoxin-NADP+ reductase (FNR) catalyzes the reduction of NADP+ to NADPH in an overall reversible reaction, showing some differences in the mechanisms between cyanobacterial and higher plant FNRs. During hydride transfer it is proposed that the FNR C-terminal Tyr is displaced by the nicotinamide. Thus, this C-terminal Tyr might be involved not only in modulating the flavin redox properties, as already shown, but also in nicotinamide binding and hydride transfer. FNR variants from the cyanobacterium Anabaena in which the C-terminal Tyr has been replaced by Trp, Phe, or Ser have been produced. All FNR variants show enhanced NADP+ and NAD+ binding, especially Tyr303Ser, which correlates with a noticeable improvement of NADH-dependent reactions. Nevertheless, the Tyr303Ser variant shows a decrease in the steady-state kcat value with NADPH. Fast kinetic analysis of the hydride transfer shows that the low efficiency observed for this mutant FNR under steady-state conditions is not due to a lack of catalytic ability but rather to the strong enzyme-coenzyme interaction. Three-dimensional structures for Tyr303Ser and Tyr303Trp variants and its complexes with NADP+ show significant differences between plant and cyanobacterial FNRs. Our results suggest that modulation of coenzyme affinity is highly influenced by the strength of the C-terminus-FAD interaction and that subtle changes between plant and cyanobacterial structures are able to modify the energy of that interaction. Additionally, it is shown that the C-terminal Tyr of FNR lowers the affinity for NADP+/H to levels compatible with steady-state turnover during the catalytic cycle, but it is not involved in the hydride transfer itself.

  • Organizational Affiliation

    Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, E-50009 Zaragoza, Spain.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
304Nostoc 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: 3.00 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.225 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 221.27α = 90
b = 221.27β = 90
c = 37.67γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-10-19
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description