Noroxomaritidine/Norcraugsodine Reductase in complex with NADP+ and piperonal

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 

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Identification of a Noroxomaritidine Reductase with Amaryllidaceae Alkaloid Biosynthesis Related Activities.

Kilgore, M.B.Holland, C.K.Jez, J.M.Kutchan, T.M.

(2016) J Biol Chem 291: 16740-16752

  • DOI: https://doi.org/10.1074/jbc.M116.717827
  • Primary Citation of Related Structures:  
    5FEU, 5FF9, 5FFF

  • PubMed Abstract: 

    Amaryllidaceae alkaloids are a large group of plant natural products with over 300 documented structures and diverse biological activities. Several groups of Amaryllidaceae alkaloids including the hemanthamine- and crinine-type alkaloids show promise as anticancer agents. Two reduction reactions are required for the production of these compounds: the reduction of norcraugsodine to norbelladine and the reduction of noroxomaritidine to normaritidine, with the enantiomer of noroxomaritidine dictating whether the derivatives will be the crinine-type or hemanthamine-type. It is also possible for the carbon-carbon double bond of noroxomaritidine to be reduced, forming the precursor for maritinamine or elwesine depending on the enantiomer reduced to an oxomaritinamine product. In this study, a short chain alcohol dehydrogenase/reductase that co-expresses with the previously discovered norbelladine 4'-O-methyltransferase from Narcissus sp. and Galanthus spp. was cloned and expressed in Escherichia coli Biochemical analyses and x-ray crystallography indicates that this protein functions as a noroxomaritidine reductase that forms oxomaritinamine from noroxomaritidine through a carbon-carbon double bond reduction. The enzyme also reduces norcraugsodine to norbelladine with a 400-fold lower specific activity. These studies identify a missing step in the biosynthesis of this pharmacologically important class of plant natural products.

  • Organizational Affiliation

    From the Donald Danforth Plant Science Center, St. Louis, Missouri 63132 and the Department of Biology, Washington University in St. Louis, St. Louis, Missouri 63130.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Noroxomaritidine/Norcraugsodine Reductase
A, B
257Narcissus pseudonarcissusMutation(s): 0 
Find proteins for A0A1A9TAK5 (Narcissus pseudonarcissus)
Explore A0A1A9TAK5 
Go to UniProtKB:  A0A1A9TAK5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1A9TAK5
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
5XC Binding MOAD:  5FFF IC50: 4.25e+5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.151 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.386α = 90
b = 73.386β = 90
c = 167.892γ = 120
Software Package:
Software NamePurpose
HKL-3000data collection
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-3000data reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesNIGMS-1RC2GM092561

Revision History  (Full details and data files)

  • Version 1.0: 2016-06-08
    Type: Initial release
  • Version 1.1: 2016-06-15
    Changes: Database references
  • Version 1.2: 2016-08-17
    Changes: Database references
  • Version 1.3: 2017-09-20
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.4: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.5: 2023-09-27
    Changes: Data collection, Database references, Refinement description