Plant nucleoside hydrolase - ZmNRh3 enzyme

Experimental Data Snapshot

  • Resolution: 2.49 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.211 

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Structure and Function of Nucleoside Hydrolases from Physcomitrella patens and Maize Catalyzing the Hydrolysis of Purine, Pyrimidine, and Cytokinin Ribosides.

Kopecna, M.Blaschke, H.Kopecny, D.Vigouroux, A.Koncitikova, R.Novak, O.Kotland, O.Strnad, M.Morera, S.von Schwartzenberg, K.

(2013) Plant Physiol 163: 1568-1583

  • DOI: https://doi.org/10.1104/pp.113.228775
  • Primary Citation of Related Structures:  
    4KPN, 4KPO

  • PubMed Abstract: 

    We present a comprehensive characterization of the nucleoside N-ribohydrolase (NRH) family in two model plants, Physcomitrella patens (PpNRH) and maize (Zea mays; ZmNRH), using in vitro and in planta approaches. We identified two NRH subclasses in the plant kingdom; one preferentially targets the purine ribosides inosine and xanthosine, while the other is more active toward uridine and xanthosine. Both subclasses can hydrolyze plant hormones such as cytokinin ribosides. We also solved the crystal structures of two purine NRHs, PpNRH1 and ZmNRH3. Structural analyses, site-directed mutagenesis experiments, and phylogenetic studies were conducted to identify the residues responsible for the observed differences in substrate specificity between the NRH isoforms. The presence of a tyrosine at position 249 (PpNRH1 numbering) confers high hydrolase activity for purine ribosides, while an aspartate residue in this position confers high activity for uridine. Bud formation is delayed by knocking out single NRH genes in P. patens, and under conditions of nitrogen shortage, PpNRH1-deficient plants cannot salvage adenosine-bound nitrogen. All PpNRH knockout plants display elevated levels of certain purine and pyrimidine ribosides and cytokinins that reflect the substrate preferences of the knocked out enzymes. NRH enzymes thus have functions in cytokinin conversion and activation as well as in purine and pyrimidine metabolism.

  • Organizational Affiliation

    Department of Protein Biochemistry and Proteomics, Center of the Region Haná for Biotechnological and Agricultural Research , Faculty of Science, Palacký University, CZ-783 71 Olomouc, Czech Republic; Laboratory of Growth Regulators, Palacký University and Institute of Experimental Botany, Academy of Sciences of the Czech Republic, CZ-783 71 Olomouc, Czech Republic.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Nucleoside N-ribohydrolase 3
A, B
330Zea maysMutation(s): 0 
Gene Names: NRH3
EC: 3.2.2
Find proteins for B6T563 (Zea mays)
Explore B6T563 
Go to UniProtKB:  B6T563
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB6T563
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.49 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.211 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.44α = 90
b = 85.78β = 90
c = 87.39γ = 90
Software Package:
Software NamePurpose
DNAdata collection
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-11-27
    Type: Initial release
  • Version 1.1: 2013-12-18
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description