Beta ODAP Synthetase (BOS)

Experimental Data Snapshot

  • Resolution: 2.35 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 

Starting Model: experimental
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Identification and characterization of the key enzyme in the biosynthesis of the neurotoxin beta-ODAP in grass pea.

Goldsmith, M.Barad, S.Knafo, M.Savidor, A.Ben-Dor, S.Brandis, A.Mehlman, T.Peleg, Y.Albeck, S.Dym, O.Ben-Zeev, E.Barbole, R.S.Aharoni, A.Reich, Z.

(2022) J Biol Chem 298: 101806-101806

  • DOI: https://doi.org/10.1016/j.jbc.2022.101806
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Grass pea (Lathyrus sativus L.) is a grain legume commonly grown in Asia and Africa for food and forage. It is a highly nutritious and robust crop, capable of surviving both droughts and floods. However, it produces a neurotoxic compound, β-N-oxalyl-L-α,β-diaminopropionic acid (β-ODAP), which can cause a severe neurological disorder when consumed as a primary diet component. While the catalytic activity associated with β-ODAP formation was demonstrated more than 50 years ago, the enzyme responsible for this activity has not been identified. Here, we report on the identity, activity, 3D structure, and phylogenesis of this enzyme-β-ODAP synthase (BOS). We show that BOS belongs to the benzylalcohol O-acetyltransferase, anthocyanin O-hydroxycinnamoyltransferase, anthranilate N-hydroxycinnamoyl/benzoyltransferase, deacetylvindoline 4-O-acetyltransferase superfamily of acyltransferases and is structurally similar to hydroxycinnamoyl transferase. Using molecular docking, we propose a mechanism for its catalytic activity, and using heterologous expression in tobacco leaves (Nicotiana benthamiana), we demonstrate that expression of BOS in the presence of its substrates is sufficient for β-ODAP production in vivo. The identification of BOS may pave the way toward engineering β-ODAP-free grass pea cultivars, which are safe for human and animal consumption.

  • Organizational Affiliation

    Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovot, Israel. Electronic address: moshe.goldsmith@weizmann.ac.il.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta ODAP Synthetase (BOS)439Lathyrus sativusMutation(s): 0 
Find proteins for A0A8F9WUQ1 (Lathyrus sativus)
Explore A0A8F9WUQ1 
Go to UniProtKB:  A0A8F9WUQ1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A8F9WUQ1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.35 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.2α = 90
b = 66.2β = 90
c = 226.38γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

  • Released Date: 2022-01-12 
  • Deposition Author(s): Dym, O.

Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United States2015839

Revision History  (Full details and data files)

  • Version 1.0: 2022-01-12
    Type: Initial release
  • Version 1.1: 2022-04-13
    Changes: Database references
  • Version 1.2: 2022-05-04
    Changes: Database references
  • Version 1.3: 2024-01-24
    Changes: Data collection, Refinement description