Crystal Structure of Methylthioalkylmalate Synthase (BjuMAM1.1) from Brassica juncea

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 

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This is version 1.3 of the entry. See complete history


Molecular Basis of the Evolution of Methylthioalkylmalate Synthase and the Diversity of Methionine-Derived Glucosinolates.

Kumar, R.Lee, S.G.Augustine, R.Reichelt, M.Vassao, D.G.Palavalli, M.H.Allen, A.Gershenzon, J.Jez, J.M.Bisht, N.C.

(2019) Plant Cell 31: 1633-1647

  • DOI: https://doi.org/10.1105/tpc.19.00046
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The globally cultivated Brassica species possess diverse aliphatic glucosinolates, which are important for plant defense and animal nutrition. The committed step in the side chain elongation of methionine-derived aliphatic glucosinolates is catalyzed by methylthioalkylmalate synthase, which likely evolved from the isopropylmalate synthases of leucine biosynthesis. However, the molecular basis for the evolution of methylthioalkylmalate synthase and its generation of natural product diversity in Brassica is poorly understood. Here, we show that Brassica genomes encode multiple methylthioalkylmalate synthases that have differences in expression profiles and 2-oxo substrate preferences, which account for the diversity of aliphatic glucosinolates across Brassica accessions. Analysis of the 2.1 Å resolution x-ray crystal structure of Brassica juncea methylthioalkylmalate synthase identified key active site residues responsible for controlling the specificity for different 2-oxo substrates and the determinants of side chain length in aliphatic glucosinolates. Overall, these results provide the evolutionary and biochemical foundation for the diversification of glucosinolate profiles across globally cultivated Brassica species, which could be used with ongoing breeding strategies toward the manipulation of beneficial glucosinolate compounds for animal health and plant protection.

  • Organizational Affiliation

    Department of Biochemistry, Max Planck Institute for Chemical Ecology, Jena D-07745, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
2-isopropylmalate synthase, A genome specific 1
A, B
505Brassica junceaMutation(s): 0 
Gene Names: gsl-elong-A1
Find proteins for C5J4P1 (Brassica juncea)
Explore C5J4P1 
Go to UniProtKB:  C5J4P1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupC5J4P1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.749α = 90
b = 90.277β = 107.75
c = 93.975γ = 90
Software Package:
Software NamePurpose
HKL-3000data reduction
Cootmodel building
HKL-3000data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesNSF-MCB-1614539

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-08
    Type: Initial release
  • Version 1.1: 2019-07-24
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-11
    Changes: Data collection, Database references, Derived calculations, Refinement description